TY  - JOUR
AU  - Pezo, Lato
AU  - Banjac, Vojislav
AU  - Pezo, Milada L.
AU  - Jovanović, Aca P.
AU  - Đuragić, Olivera
AU  - Čolović, Dušica
AU  - Čolović, Radmilo
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9726
AB  - The processes of transportation of bulk materials from silos and hoppers are significant in various industrial applications because of their influences on material characteristics and working parameters of the production process. In this paper, a rotating valve feeder, with eight vanes was investigated for transport action of bulk materials, such as wheat, maize and rice, which were ground, using the sieve sizes of 1, 3 and 5 mm. The rotating valve feeders under investigation have proven to be useful in transportation processes despite their construction simplicity. All investigations were done experimentally and numerically, using coupled Discrete Element Method (DEM) and Computational Fluid Dynamics calculation (CFD). The influences of different types of bulk materials and its particle size, on the performances of the rotating valve feeder during material transport were explored. The artificial neural network was developed (in the form of a multi-layer perceptron model) in order to optimize the granular flow of the bulk material, showing the high prediction capability of bulk density, dosing time and granular material flow, with the coefficient of determination equal to 0.999 during the training period. The decreasing of the sieve opening diameter caused the decrease in bulk density of the ground material, but statistically significant only for rice, as seen from the experiments and the results of the neural network model. The 5 mm sieve ensured the material with the highest flowability, significantly increasing the granular flow and decreasing the dosing time. The granular particles were modelled as the spheres in the DEM/CFD simulation, with a small-sized triangular surfaces. The DEM/CFD prediction of the mass transport for rice, wheat and maize was quite adequate, obtaining the coefficient of determination being 0.997; 0.998 and 0.849, respectively.
T2  - Animal Feed Science and Technology
T1  - Mathematical model, numerical simulation and optimization of rotating valve feeder in animal feed production
VL  - 272
SP  - 114741
DO  - 10.1016/j.anifeedsci.2020.114741
ER  - 

@article{
author = "Pezo, Lato and Banjac, Vojislav and Pezo, Milada L. and Jovanović, Aca P. and Đuragić, Olivera and Čolović, Dušica and Čolović, Radmilo",
year = "2021",
abstract = "The processes of transportation of bulk materials from silos and hoppers are significant in various industrial applications because of their influences on material characteristics and working parameters of the production process. In this paper, a rotating valve feeder, with eight vanes was investigated for transport action of bulk materials, such as wheat, maize and rice, which were ground, using the sieve sizes of 1, 3 and 5 mm. The rotating valve feeders under investigation have proven to be useful in transportation processes despite their construction simplicity. All investigations were done experimentally and numerically, using coupled Discrete Element Method (DEM) and Computational Fluid Dynamics calculation (CFD). The influences of different types of bulk materials and its particle size, on the performances of the rotating valve feeder during material transport were explored. The artificial neural network was developed (in the form of a multi-layer perceptron model) in order to optimize the granular flow of the bulk material, showing the high prediction capability of bulk density, dosing time and granular material flow, with the coefficient of determination equal to 0.999 during the training period. The decreasing of the sieve opening diameter caused the decrease in bulk density of the ground material, but statistically significant only for rice, as seen from the experiments and the results of the neural network model. The 5 mm sieve ensured the material with the highest flowability, significantly increasing the granular flow and decreasing the dosing time. The granular particles were modelled as the spheres in the DEM/CFD simulation, with a small-sized triangular surfaces. The DEM/CFD prediction of the mass transport for rice, wheat and maize was quite adequate, obtaining the coefficient of determination being 0.997; 0.998 and 0.849, respectively.",
journal = "Animal Feed Science and Technology",
title = "Mathematical model, numerical simulation and optimization of rotating valve feeder in animal feed production",
volume = "272",
pages = "114741",
doi = "10.1016/j.anifeedsci.2020.114741"
}

Pezo, L., Banjac, V., Pezo, M. L., Jovanović, A. P., Đuragić, O., Čolović, D.,& Čolović, R.. (2021). Mathematical model, numerical simulation and optimization of rotating valve feeder in animal feed production. in Animal Feed Science and Technology, 272, 114741.
https://doi.org/10.1016/j.anifeedsci.2020.114741

Pezo L, Banjac V, Pezo ML, Jovanović AP, Đuragić O, Čolović D, Čolović R. Mathematical model, numerical simulation and optimization of rotating valve feeder in animal feed production. in Animal Feed Science and Technology. 2021;272:114741.
doi:10.1016/j.anifeedsci.2020.114741 .

Pezo, Lato, Banjac, Vojislav, Pezo, Milada L., Jovanović, Aca P., Đuragić, Olivera, Čolović, Dušica, Čolović, Radmilo, "Mathematical model, numerical simulation and optimization of rotating valve feeder in animal feed production" in Animal Feed Science and Technology, 272 (2021):114741,
https://doi.org/10.1016/j.anifeedsci.2020.114741 . .

TY  - JOUR
AU  - Pezo, Lato
AU  - Pezo, Milada L.
AU  - Banjac, Vojislav
AU  - Jovanović, Aca
AU  - Krulj, Jelena
AU  - Kojić, Jovana
AU  - Kojić, Predrag
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9118
AB  - The mixing quality of the pigeon diet mix was studied after the mixing in the Ross-type static mixer (pre-mixer) and the vertical feed mixer (final mixer in the line). Three different experiments were performed: firstly, the possibilities of static mixer were investigated, secondly the blending performance of the vertical feed mixer, and the combination of these approaches in the third experiment. The Discrete Element Method was used in numerical modelling of granular flow in the pre-mixer and the vertical feed mixer, to predict the inter-particle mixing quality, and the results of the mixing. The results of the model were compared with appropriate experiments. The main goal was to foresee the behaviour of mixture in two type of mixers and to evaluate the combined mixing action of these two mixers, in order to explore the possibilities to increase the mixing quality, shorten the mixing time and to reduce the energy consumption.
T2  - Powder Technology
T1  - Blending performance of the coupled Ross static mixer and vertical feed mixer - Discrete element model approach
VL  - 375
SP  - 20
EP  - 27
DO  - 10.1016/j.powtec.2020.07.104
ER  - 

@article{
author = "Pezo, Lato and Pezo, Milada L. and Banjac, Vojislav and Jovanović, Aca and Krulj, Jelena and Kojić, Jovana and Kojić, Predrag",
year = "2020",
abstract = "The mixing quality of the pigeon diet mix was studied after the mixing in the Ross-type static mixer (pre-mixer) and the vertical feed mixer (final mixer in the line). Three different experiments were performed: firstly, the possibilities of static mixer were investigated, secondly the blending performance of the vertical feed mixer, and the combination of these approaches in the third experiment. The Discrete Element Method was used in numerical modelling of granular flow in the pre-mixer and the vertical feed mixer, to predict the inter-particle mixing quality, and the results of the mixing. The results of the model were compared with appropriate experiments. The main goal was to foresee the behaviour of mixture in two type of mixers and to evaluate the combined mixing action of these two mixers, in order to explore the possibilities to increase the mixing quality, shorten the mixing time and to reduce the energy consumption.",
journal = "Powder Technology",
title = "Blending performance of the coupled Ross static mixer and vertical feed mixer - Discrete element model approach",
volume = "375",
pages = "20-27",
doi = "10.1016/j.powtec.2020.07.104"
}

Pezo, L., Pezo, M. L., Banjac, V., Jovanović, A., Krulj, J., Kojić, J.,& Kojić, P.. (2020). Blending performance of the coupled Ross static mixer and vertical feed mixer - Discrete element model approach. in Powder Technology, 375, 20-27.
https://doi.org/10.1016/j.powtec.2020.07.104

Pezo L, Pezo ML, Banjac V, Jovanović A, Krulj J, Kojić J, Kojić P. Blending performance of the coupled Ross static mixer and vertical feed mixer - Discrete element model approach. in Powder Technology. 2020;375:20-27.
doi:10.1016/j.powtec.2020.07.104 .

Pezo, Lato, Pezo, Milada L., Banjac, Vojislav, Jovanović, Aca, Krulj, Jelena, Kojić, Jovana, Kojić, Predrag, "Blending performance of the coupled Ross static mixer and vertical feed mixer - Discrete element model approach" in Powder Technology, 375 (2020):20-27,
https://doi.org/10.1016/j.powtec.2020.07.104 . .

TY  - JOUR
AU  - Pezo, Milada L.
AU  - Pezo, Lato
AU  - Jovanović, Aca
AU  - Terzić, Anja
AU  - Andrić, Ljubiša
AU  - Lončar, Biljana
AU  - Kojić, Predrag
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0032591018304480
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7719
AB  - In this paper, five types of horizontal single-pitch screw conveyors with modified geometry, with three different lengths (400, 600 and 800 mm) were investigated for transport and auxiliary mixing action of two materials: natural zeolite and quartz aggregate (sand) with particle sizes 3, 4 and 5 mm. The geometry of the screw transporter is changed by welding three additional helices oriented in the same or the opposite direction from screw cutting edges, enabling the premixing of materials, during the transport. The proper mixing of the observed materials provides an adequate disposition of zeolite particles within the composite and prevents agglomeration and interference with cement hydration. Zeolite application as a binder in a building material is a possible solution to environmental pollution problems caused by cement production. The influences of screw length, particle diameter, the studied geometry variations of screw design, on the mixing performances of the screw conveyor-mixer during material transport were explored. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM). The experimental results and the results of the DEM investigation were used for the development of mathematical models for the prediction of mixing quality, which are presented in the form of second order polynomial and artificial neural network model.
T2  - Powder Technology
T1  - Discrete element model of particle transport and premixing action in modified screw conveyors
VL  - 336
SP  - 255
EP  - 264
DO  - 10.1016/j.powtec.2018.06.009
ER  - 

@article{
author = "Pezo, Milada L. and Pezo, Lato and Jovanović, Aca and Terzić, Anja and Andrić, Ljubiša and Lončar, Biljana and Kojić, Predrag",
year = "2018",
abstract = "In this paper, five types of horizontal single-pitch screw conveyors with modified geometry, with three different lengths (400, 600 and 800 mm) were investigated for transport and auxiliary mixing action of two materials: natural zeolite and quartz aggregate (sand) with particle sizes 3, 4 and 5 mm. The geometry of the screw transporter is changed by welding three additional helices oriented in the same or the opposite direction from screw cutting edges, enabling the premixing of materials, during the transport. The proper mixing of the observed materials provides an adequate disposition of zeolite particles within the composite and prevents agglomeration and interference with cement hydration. Zeolite application as a binder in a building material is a possible solution to environmental pollution problems caused by cement production. The influences of screw length, particle diameter, the studied geometry variations of screw design, on the mixing performances of the screw conveyor-mixer during material transport were explored. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM). The experimental results and the results of the DEM investigation were used for the development of mathematical models for the prediction of mixing quality, which are presented in the form of second order polynomial and artificial neural network model.",
journal = "Powder Technology",
title = "Discrete element model of particle transport and premixing action in modified screw conveyors",
volume = "336",
pages = "255-264",
doi = "10.1016/j.powtec.2018.06.009"
}

Pezo, M. L., Pezo, L., Jovanović, A., Terzić, A., Andrić, L., Lončar, B.,& Kojić, P.. (2018). Discrete element model of particle transport and premixing action in modified screw conveyors. in Powder Technology, 336, 255-264.
https://doi.org/10.1016/j.powtec.2018.06.009

Pezo ML, Pezo L, Jovanović A, Terzić A, Andrić L, Lončar B, Kojić P. Discrete element model of particle transport and premixing action in modified screw conveyors. in Powder Technology. 2018;336:255-264.
doi:10.1016/j.powtec.2018.06.009 .

Pezo, Milada L., Pezo, Lato, Jovanović, Aca, Terzić, Anja, Andrić, Ljubiša, Lončar, Biljana, Kojić, Predrag, "Discrete element model of particle transport and premixing action in modified screw conveyors" in Powder Technology, 336 (2018):255-264,
https://doi.org/10.1016/j.powtec.2018.06.009 . .

TY  - JOUR
AU  - Pezo, Lato
AU  - Pezo, Milada L.
AU  - Jovanović, Aca
AU  - Čolović, Radmilo
AU  - Vukmirović, Đuro
AU  - Banjac, Vojislav
AU  - Đuragić, Olivera
PY  - 2018
UR  - http://linkinghub.elsevier.com/retrieve/pii/S092188311830147X
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7673
AB  - In this study, the mixing performance of coupled mixing action of the Komax static mixer (which is used as a pre-mixer) and rotating drum (applied as the final mixer) was explored in the maize meal mixing operation. The main objective of this paper was to predict the behaviour of the previously grinded maize particles, during the mixing process in static mixer and drum mixer, and to explore the possibilities to shorten the mixing time in the main mixer (in order to reduce the energy consumption). Three different experiments were performed: in the first experiment, possibilities of static mixer were explored, second experiment showed the mixing performance of rotating drum, and the combination of these two mixing devices was investigated in the third experiment. Homogeneity of the obtained mixtures was determined experimentally, by the “Microtracers” method. The Discrete Element Method was used for modelling of granular flow in the pre-mixing and final mixing applications, and to predict the inter-particle mixing quality within a static mixer and the rotating drum mixer. The results of the numerical simulation are compared with appropriate experimental results. The possible industrial application of this model could be the optimization of parameters of mixing systems taking into account the quality and the duration of the mixing process.
T2  - Advanced Powder Technology
T1  - The joint mixing action of the static pre-mixer and the rotating drum mixer – Discrete element method approach
VL  - 29
IS  - 7
SP  - 1734
EP  - 1741
DO  - 10.1016/j.apt.2018.04.008
ER  - 

@article{
author = "Pezo, Lato and Pezo, Milada L. and Jovanović, Aca and Čolović, Radmilo and Vukmirović, Đuro and Banjac, Vojislav and Đuragić, Olivera",
year = "2018",
abstract = "In this study, the mixing performance of coupled mixing action of the Komax static mixer (which is used as a pre-mixer) and rotating drum (applied as the final mixer) was explored in the maize meal mixing operation. The main objective of this paper was to predict the behaviour of the previously grinded maize particles, during the mixing process in static mixer and drum mixer, and to explore the possibilities to shorten the mixing time in the main mixer (in order to reduce the energy consumption). Three different experiments were performed: in the first experiment, possibilities of static mixer were explored, second experiment showed the mixing performance of rotating drum, and the combination of these two mixing devices was investigated in the third experiment. Homogeneity of the obtained mixtures was determined experimentally, by the “Microtracers” method. The Discrete Element Method was used for modelling of granular flow in the pre-mixing and final mixing applications, and to predict the inter-particle mixing quality within a static mixer and the rotating drum mixer. The results of the numerical simulation are compared with appropriate experimental results. The possible industrial application of this model could be the optimization of parameters of mixing systems taking into account the quality and the duration of the mixing process.",
journal = "Advanced Powder Technology",
title = "The joint mixing action of the static pre-mixer and the rotating drum mixer – Discrete element method approach",
volume = "29",
number = "7",
pages = "1734-1741",
doi = "10.1016/j.apt.2018.04.008"
}

Pezo, L., Pezo, M. L., Jovanović, A., Čolović, R., Vukmirović, Đ., Banjac, V.,& Đuragić, O.. (2018). The joint mixing action of the static pre-mixer and the rotating drum mixer – Discrete element method approach. in Advanced Powder Technology, 29(7), 1734-1741.
https://doi.org/10.1016/j.apt.2018.04.008

Pezo L, Pezo ML, Jovanović A, Čolović R, Vukmirović Đ, Banjac V, Đuragić O. The joint mixing action of the static pre-mixer and the rotating drum mixer – Discrete element method approach. in Advanced Powder Technology. 2018;29(7):1734-1741.
doi:10.1016/j.apt.2018.04.008 .

Pezo, Lato, Pezo, Milada L., Jovanović, Aca, Čolović, Radmilo, Vukmirović, Đuro, Banjac, Vojislav, Đuragić, Olivera, "The joint mixing action of the static pre-mixer and the rotating drum mixer – Discrete element method approach" in Advanced Powder Technology, 29, no. 7 (2018):1734-1741,
https://doi.org/10.1016/j.apt.2018.04.008 . .

TY  - JOUR
AU  - Pezo, Lato
AU  - Pezo, Milada L.
AU  - Jovanović, Aca
AU  - Kosanić, Nenad
AU  - Petrović, Aleksandar Lj.
AU  - Lević, Ljubinko
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1307
AB  - The mixing process greatly influences the mixing efficiency, as well as the quality and the price of the intermediate and/or the final product. Static mixer is used for premixing action before the main mixing process, for significant reduction of mixing time and energy consumption. This type of premixing action is not investigated in detail in the open literature. In this article, the novel numerical approach called Discrete Element Method is used for modelling of granular flow in multiple static mixer applications (1-3 Komax or Ross mixing elements were utilized), while the Computational Fluid Dynamic Method was chosen for fluid flow modelling, using the Eulerian multiphase model. The main aim of this article is to predict the behavior of granules being gravitationally transported in different mixer configuration and to choose the best configuration of the mixer taking into account the total particle path, the number of mixing elements and the quality of the obtained mixture. The results of the numerical simulations in the static mixers were compared to experimental results, the mixing quality is examined by RSD (relative standard deviation) criterion, and the effects on the mixer type and the number of mixing elements on mixing process were studied. The effects of the mixer type and the number of mixing elements on mixing process were studied using analysis of variance (ANOVA). Mathematical modelling is used for optimization of number of Ross and Komax segments in mixer in order to gain desirable mixing results.
T2  - Hemijska industrija
T1  - Granular flow in static mixers by coupled DEM/CFD approach
VL  - 70
IS  - 5
SP  - 539
EP  - 546
DO  - 10.2298/HEMIND151013060P
ER  - 

@article{
author = "Pezo, Lato and Pezo, Milada L. and Jovanović, Aca and Kosanić, Nenad and Petrović, Aleksandar Lj. and Lević, Ljubinko",
year = "2016",
abstract = "The mixing process greatly influences the mixing efficiency, as well as the quality and the price of the intermediate and/or the final product. Static mixer is used for premixing action before the main mixing process, for significant reduction of mixing time and energy consumption. This type of premixing action is not investigated in detail in the open literature. In this article, the novel numerical approach called Discrete Element Method is used for modelling of granular flow in multiple static mixer applications (1-3 Komax or Ross mixing elements were utilized), while the Computational Fluid Dynamic Method was chosen for fluid flow modelling, using the Eulerian multiphase model. The main aim of this article is to predict the behavior of granules being gravitationally transported in different mixer configuration and to choose the best configuration of the mixer taking into account the total particle path, the number of mixing elements and the quality of the obtained mixture. The results of the numerical simulations in the static mixers were compared to experimental results, the mixing quality is examined by RSD (relative standard deviation) criterion, and the effects on the mixer type and the number of mixing elements on mixing process were studied. The effects of the mixer type and the number of mixing elements on mixing process were studied using analysis of variance (ANOVA). Mathematical modelling is used for optimization of number of Ross and Komax segments in mixer in order to gain desirable mixing results.",
journal = "Hemijska industrija",
title = "Granular flow in static mixers by coupled DEM/CFD approach",
volume = "70",
number = "5",
pages = "539-546",
doi = "10.2298/HEMIND151013060P"
}

Pezo, L., Pezo, M. L., Jovanović, A., Kosanić, N., Petrović, A. Lj.,& Lević, L.. (2016). Granular flow in static mixers by coupled DEM/CFD approach. in Hemijska industrija, 70(5), 539-546.
https://doi.org/10.2298/HEMIND151013060P

Pezo L, Pezo ML, Jovanović A, Kosanić N, Petrović AL, Lević L. Granular flow in static mixers by coupled DEM/CFD approach. in Hemijska industrija. 2016;70(5):539-546.
doi:10.2298/HEMIND151013060P .

Pezo, Lato, Pezo, Milada L., Jovanović, Aca, Kosanić, Nenad, Petrović, Aleksandar Lj., Lević, Ljubinko, "Granular flow in static mixers by coupled DEM/CFD approach" in Hemijska industrija, 70, no. 5 (2016):539-546,
https://doi.org/10.2298/HEMIND151013060P . .

TY  - JOUR
AU  - Pezo, Milada L.
AU  - Pezo, Lato
AU  - Jovanović, Aca
AU  - Lončar, Biljana
AU  - Čolović, Radmilo
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1090
AB  - DEM/CFD (Discrete Element Method/Computational Fluid Dynamic) approach was used to develop a three dimensional model of fluid flow and mixing process of solid particles within the revolving static mixer, type Komax. Static mixers are widely used in process industry, food industry, pharmaceutical and chemical industry. Mixing process adds significant value to the final product and it can be regarded as a key process. The quality and the price of the product often depend on mixing efficiency. Both design and operation of the mixing unit itself have a strong influence on the quality produced. In this paper, DEM is used for modeling granular flow of zeolite spheres in the revolving Komax static mixer and CFD method was used for modeling fluid flow through the Eulerian multiphase model. Coupling of these two methods provides reliable analysis of particle motion and flow pattern of the working fluid. The objective of this paper is to predict the behavior of particles after several rotations of the revolving static mixer. This type of device is used for premixing action before the main mixing process, for significant reduction of mixing time and energy consumption. This type of premixing action is not investigated in detail in the open literature. The results of the numerical simulation are compared with appropriate experimental results. The special design revolving static mixer, made of transparent Plexiglas was used for this experiment. Mixing quality was examined by RSD (relative standard deviation) criterion. Application of this model provides the optimization of the number of revolutions and geometrical parameters of mixing process taking into account the quality of the mixing process. (c) 2016 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Chemical Engineering Research and Design
T1  - DEM/CFD approach for modeling granular flow in the revolving static mixer
VL  - 109
SP  - 317
EP  - 326
DO  - 10.1016/j.cherd.2016.02.003
ER  - 

@article{
author = "Pezo, Milada L. and Pezo, Lato and Jovanović, Aca and Lončar, Biljana and Čolović, Radmilo",
year = "2016",
abstract = "DEM/CFD (Discrete Element Method/Computational Fluid Dynamic) approach was used to develop a three dimensional model of fluid flow and mixing process of solid particles within the revolving static mixer, type Komax. Static mixers are widely used in process industry, food industry, pharmaceutical and chemical industry. Mixing process adds significant value to the final product and it can be regarded as a key process. The quality and the price of the product often depend on mixing efficiency. Both design and operation of the mixing unit itself have a strong influence on the quality produced. In this paper, DEM is used for modeling granular flow of zeolite spheres in the revolving Komax static mixer and CFD method was used for modeling fluid flow through the Eulerian multiphase model. Coupling of these two methods provides reliable analysis of particle motion and flow pattern of the working fluid. The objective of this paper is to predict the behavior of particles after several rotations of the revolving static mixer. This type of device is used for premixing action before the main mixing process, for significant reduction of mixing time and energy consumption. This type of premixing action is not investigated in detail in the open literature. The results of the numerical simulation are compared with appropriate experimental results. The special design revolving static mixer, made of transparent Plexiglas was used for this experiment. Mixing quality was examined by RSD (relative standard deviation) criterion. Application of this model provides the optimization of the number of revolutions and geometrical parameters of mixing process taking into account the quality of the mixing process. (c) 2016 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Chemical Engineering Research and Design",
title = "DEM/CFD approach for modeling granular flow in the revolving static mixer",
volume = "109",
pages = "317-326",
doi = "10.1016/j.cherd.2016.02.003"
}

Pezo, M. L., Pezo, L., Jovanović, A., Lončar, B.,& Čolović, R.. (2016). DEM/CFD approach for modeling granular flow in the revolving static mixer. in Chemical Engineering Research and Design
Elsevier., 109, 317-326.
https://doi.org/10.1016/j.cherd.2016.02.003

Pezo ML, Pezo L, Jovanović A, Lončar B, Čolović R. DEM/CFD approach for modeling granular flow in the revolving static mixer. in Chemical Engineering Research and Design. 2016;109:317-326.
doi:10.1016/j.cherd.2016.02.003 .

Pezo, Milada L., Pezo, Lato, Jovanović, Aca, Lončar, Biljana, Čolović, Radmilo, "DEM/CFD approach for modeling granular flow in the revolving static mixer" in Chemical Engineering Research and Design, 109 (2016):317-326,
https://doi.org/10.1016/j.cherd.2016.02.003 . .

TY  - JOUR
AU  - Jovanović, Aca
AU  - Pezo, Lato
AU  - Pezo, Milada
AU  - Lončar, Biljana
AU  - Nićetin, Milica
AU  - Stanojlović, Sanja
AU  - Lević, Ljubinko
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11184
AB  - The mixing process greatly influence the quality of the intermediate and/or the final product, moreover, the parameters of the mixing process and the design of used equipment have a strong impact on mixing efficiency, the quality and the price of the product. In this article, Discrete Element Method is used for modeling of granular flow in multiple static mixer applications (Komax and Ross configurations were utilized). Computational Fluid Dynamic method was chosen for fluid flow modeling, using Eulerian multiphase model. Coupling of these two methods provides reliable, sufficiently correct and adequate results of proposed model compared to experimental measurements. The aim of this article is to predict the behavior of granules in different mixer configuration and to optimize parameters of the mixing process taking into account the duration of the mixing process and the quality of mixture, as well as the price of final product.
AB  - Proces mešanja veoma utiče na kvalitet krajnjeg poluproizvoda i/ili krajnjeg proizvoda, a parametri procesa mešanja i dizajn opreme veoma utiču na efikasnost mešanja, kvalitet proizvoda i cenu proizvoda. U ovom radu, prikazana je upotreba metode diskretnih elemenata (engl. Discrete Element Method - DEM) na modelovanje mešanja granula u različitim konfiguracijama statičkih mešača (korišćene su različite Komax i Ross konfiguracije za mešanje). Za modelovanje protoka fluida primenjena je metoda računske dinamike fluida (engl. Computational Fluid Dynamic - CFD), korišćenjem Ojlerovog višefaznog modela. Povezivanjem rezultata ove dve metode dobija se pouzdan, dovoljno tačan i adekvatan model koji daje rezultate koji odgovaraju eksperimentalnim merenjima. Praćene su i analizirane trajektorije, brzine i ubrzanja čestica, u cilju procene kvaliteta procesa mešanja. Dobro poznati kriterijum za kvalitet mešanja, pod nazivom relativna standardna devijacija (RSD) je korišćen za ovu svrhu. Optimizacija dimenzija i parametara mešanja u statičkoj mešalici je izvedena korišćenjem matematičkog modeliranja. Cilj ovog rada je bio da se predvidi ponašanje granulamog materijala u različitim konfiguracijama mešalica i da optimizuje parametre procesa uzimajući u obzir trajanje procesa mešanja, kvalitet mešavine i cenu finalnog proizvoda mešanja. U istraživanju je primećeno da su Komax elementi primenljiviji, u poređenju sa Ross elementima, posebno kada je visina instalacije mala. Međutim, upotreba Ross je finansijski prihvatljivija, zbog njegove jednostavnije geometrije. Dodatna pregrada sa kvadratnim otvorima, koja se postavlja na izlazu iz statičke mešalice, koristi se da bi se umirilo kretanje granula na obodu cevi, kao i da smanji segregaciju granula.
T2  - Journal on processing and energy in agriculture
T1  - Granular flow in static mixers - DEM/CFD approach
T1  - Protok granulisanog materijala u statičkoj mešalici, DEM/CFD pristup
VL  - 19
IS  - 2
SP  - 98
EP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11184
ER  - 

@article{
author = "Jovanović, Aca and Pezo, Lato and Pezo, Milada and Lončar, Biljana and Nićetin, Milica and Stanojlović, Sanja and Lević, Ljubinko",
year = "2015",
abstract = "The mixing process greatly influence the quality of the intermediate and/or the final product, moreover, the parameters of the mixing process and the design of used equipment have a strong impact on mixing efficiency, the quality and the price of the product. In this article, Discrete Element Method is used for modeling of granular flow in multiple static mixer applications (Komax and Ross configurations were utilized). Computational Fluid Dynamic method was chosen for fluid flow modeling, using Eulerian multiphase model. Coupling of these two methods provides reliable, sufficiently correct and adequate results of proposed model compared to experimental measurements. The aim of this article is to predict the behavior of granules in different mixer configuration and to optimize parameters of the mixing process taking into account the duration of the mixing process and the quality of mixture, as well as the price of final product., Proces mešanja veoma utiče na kvalitet krajnjeg poluproizvoda i/ili krajnjeg proizvoda, a parametri procesa mešanja i dizajn opreme veoma utiču na efikasnost mešanja, kvalitet proizvoda i cenu proizvoda. U ovom radu, prikazana je upotreba metode diskretnih elemenata (engl. Discrete Element Method - DEM) na modelovanje mešanja granula u različitim konfiguracijama statičkih mešača (korišćene su različite Komax i Ross konfiguracije za mešanje). Za modelovanje protoka fluida primenjena je metoda računske dinamike fluida (engl. Computational Fluid Dynamic - CFD), korišćenjem Ojlerovog višefaznog modela. Povezivanjem rezultata ove dve metode dobija se pouzdan, dovoljno tačan i adekvatan model koji daje rezultate koji odgovaraju eksperimentalnim merenjima. Praćene su i analizirane trajektorije, brzine i ubrzanja čestica, u cilju procene kvaliteta procesa mešanja. Dobro poznati kriterijum za kvalitet mešanja, pod nazivom relativna standardna devijacija (RSD) je korišćen za ovu svrhu. Optimizacija dimenzija i parametara mešanja u statičkoj mešalici je izvedena korišćenjem matematičkog modeliranja. Cilj ovog rada je bio da se predvidi ponašanje granulamog materijala u različitim konfiguracijama mešalica i da optimizuje parametre procesa uzimajući u obzir trajanje procesa mešanja, kvalitet mešavine i cenu finalnog proizvoda mešanja. U istraživanju je primećeno da su Komax elementi primenljiviji, u poređenju sa Ross elementima, posebno kada je visina instalacije mala. Međutim, upotreba Ross je finansijski prihvatljivija, zbog njegove jednostavnije geometrije. Dodatna pregrada sa kvadratnim otvorima, koja se postavlja na izlazu iz statičke mešalice, koristi se da bi se umirilo kretanje granula na obodu cevi, kao i da smanji segregaciju granula.",
journal = "Journal on processing and energy in agriculture",
title = "Granular flow in static mixers - DEM/CFD approach, Protok granulisanog materijala u statičkoj mešalici, DEM/CFD pristup",
volume = "19",
number = "2",
pages = "98-101",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11184"
}

Jovanović, A., Pezo, L., Pezo, M., Lončar, B., Nićetin, M., Stanojlović, S.,& Lević, L.. (2015). Granular flow in static mixers - DEM/CFD approach. in Journal on processing and energy in agriculture, 19(2), 98-101.
https://hdl.handle.net/21.15107/rcub_vinar_11184

Jovanović A, Pezo L, Pezo M, Lončar B, Nićetin M, Stanojlović S, Lević L. Granular flow in static mixers - DEM/CFD approach. in Journal on processing and energy in agriculture. 2015;19(2):98-101.
https://hdl.handle.net/21.15107/rcub_vinar_11184 .

Jovanović, Aca, Pezo, Lato, Pezo, Milada, Lončar, Biljana, Nićetin, Milica, Stanojlović, Sanja, Lević, Ljubinko, "Granular flow in static mixers - DEM/CFD approach" in Journal on processing and energy in agriculture, 19, no. 2 (2015):98-101,
https://hdl.handle.net/21.15107/rcub_vinar_11184 .

TY  - JOUR
AU  - Pezo, Lato
AU  - Jovanović, Aca
AU  - Pezo, Milada L.
AU  - Čolović, Radmilo
AU  - Lončar, Biljana
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/755
AB  - Screw conveyors are widely used in the food industry, building construction and mining companies, chemical, agricultural and processing industries, mostly for elevating and/or transporting bulk materials over short to medium distances. Despite their apparent simplicity, the improvement of the transport parameters is a very demanding task and designers usually have to rely on data obtained from empirical investigations. In this paper, fifteen horizontal single-pitch screw conveyors with modified geometry and the different lengths were investigated for premixing action, during the transport of materials. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM). The influences of screw length, observed geometry variations and different types of screw design, on the performances of the screw conveyor-mixer during material transport were explored. The auxiliary mixing action (used to improve the mixing process) was achieved during the transport of the material. The geometry of the screw conveyor is changed by adding three complementary helices oriented in the same or the opposite direction from screw blades. The particles of the material being transported tumble down from the top of the helix to the next free surface, and that segment of helix was used for additional mixing action. According to experiments and DEM analysis, the particle path length is increased, with the observed modification of screw conveyor, and the improved geometry could be determined for increasing the quality of mixing. (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
T2  - Advanced Powder Technology
T1  - Modified screw conveyor-mixers - Discrete element modeling approach
VL  - 26
IS  - 5
SP  - 1391
EP  - 1399
DO  - 10.1016/j.apt.2015.07.016
ER  - 

@article{
author = "Pezo, Lato and Jovanović, Aca and Pezo, Milada L. and Čolović, Radmilo and Lončar, Biljana",
year = "2015",
abstract = "Screw conveyors are widely used in the food industry, building construction and mining companies, chemical, agricultural and processing industries, mostly for elevating and/or transporting bulk materials over short to medium distances. Despite their apparent simplicity, the improvement of the transport parameters is a very demanding task and designers usually have to rely on data obtained from empirical investigations. In this paper, fifteen horizontal single-pitch screw conveyors with modified geometry and the different lengths were investigated for premixing action, during the transport of materials. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM). The influences of screw length, observed geometry variations and different types of screw design, on the performances of the screw conveyor-mixer during material transport were explored. The auxiliary mixing action (used to improve the mixing process) was achieved during the transport of the material. The geometry of the screw conveyor is changed by adding three complementary helices oriented in the same or the opposite direction from screw blades. The particles of the material being transported tumble down from the top of the helix to the next free surface, and that segment of helix was used for additional mixing action. According to experiments and DEM analysis, the particle path length is increased, with the observed modification of screw conveyor, and the improved geometry could be determined for increasing the quality of mixing. (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.",
journal = "Advanced Powder Technology",
title = "Modified screw conveyor-mixers - Discrete element modeling approach",
volume = "26",
number = "5",
pages = "1391-1399",
doi = "10.1016/j.apt.2015.07.016"
}

Pezo, L., Jovanović, A., Pezo, M. L., Čolović, R.,& Lončar, B.. (2015). Modified screw conveyor-mixers - Discrete element modeling approach. in Advanced Powder Technology, 26(5), 1391-1399.
https://doi.org/10.1016/j.apt.2015.07.016

Pezo L, Jovanović A, Pezo ML, Čolović R, Lončar B. Modified screw conveyor-mixers - Discrete element modeling approach. in Advanced Powder Technology. 2015;26(5):1391-1399.
doi:10.1016/j.apt.2015.07.016 .

Pezo, Lato, Jovanović, Aca, Pezo, Milada L., Čolović, Radmilo, Lončar, Biljana, "Modified screw conveyor-mixers - Discrete element modeling approach" in Advanced Powder Technology, 26, no. 5 (2015):1391-1399,
https://doi.org/10.1016/j.apt.2015.07.016 . .

TY  - JOUR
AU  - Jovanović, Aca
AU  - Pezo, Milada L.
AU  - Pezo, Lato
AU  - Lević, Ljubinko
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/87
AB  - Mixing of powders, particles and/or granules obtains an economic importance in various technologies, and in the food, pharmaceutical and chemical industries. In many cases, the mixing process greatly influences the quality of the final product. The parameters of the mixing process and the design of equipment have a strong impact on the mixing efficiency, and the quality and the price of the intermediate or final product. In this study, the discrete element method (DEM) is used for modeling of granular flow in various multiple Komax and Ross mixing applications. Computational fluid dynamic (CFD) method was used for modeling of fluid flow through the Eulerian multiphase model. Coupling of these two methods provides reliable, sufficiently correct and adequate results of the proposed model compared to experimental measurements. The objective of this paper is to predict the behavior of particles in different static mixer configurations. The results of the numerical simulation are compared with appropriate experimental results. Application of this model provides the optimization of the geometry and parameters of mixing systems taking into account the quality of the mixing process and the cost of the final product. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Powder Technology
T1  - DEM/CFD analysis of granular flow in static mixers
VL  - 266
SP  - 240
EP  - 248
DO  - 10.1016/j.powtec.2014.06.032
ER  - 

@article{
author = "Jovanović, Aca and Pezo, Milada L. and Pezo, Lato and Lević, Ljubinko",
year = "2014",
abstract = "Mixing of powders, particles and/or granules obtains an economic importance in various technologies, and in the food, pharmaceutical and chemical industries. In many cases, the mixing process greatly influences the quality of the final product. The parameters of the mixing process and the design of equipment have a strong impact on the mixing efficiency, and the quality and the price of the intermediate or final product. In this study, the discrete element method (DEM) is used for modeling of granular flow in various multiple Komax and Ross mixing applications. Computational fluid dynamic (CFD) method was used for modeling of fluid flow through the Eulerian multiphase model. Coupling of these two methods provides reliable, sufficiently correct and adequate results of the proposed model compared to experimental measurements. The objective of this paper is to predict the behavior of particles in different static mixer configurations. The results of the numerical simulation are compared with appropriate experimental results. Application of this model provides the optimization of the geometry and parameters of mixing systems taking into account the quality of the mixing process and the cost of the final product. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Powder Technology",
title = "DEM/CFD analysis of granular flow in static mixers",
volume = "266",
pages = "240-248",
doi = "10.1016/j.powtec.2014.06.032"
}

Jovanović, A., Pezo, M. L., Pezo, L.,& Lević, L.. (2014). DEM/CFD analysis of granular flow in static mixers. in Powder Technology, 266, 240-248.
https://doi.org/10.1016/j.powtec.2014.06.032

Jovanović A, Pezo ML, Pezo L, Lević L. DEM/CFD analysis of granular flow in static mixers. in Powder Technology. 2014;266:240-248.
doi:10.1016/j.powtec.2014.06.032 .

Jovanović, Aca, Pezo, Milada L., Pezo, Lato, Lević, Ljubinko, "DEM/CFD analysis of granular flow in static mixers" in Powder Technology, 266 (2014):240-248,
https://doi.org/10.1016/j.powtec.2014.06.032 . .