Lončar, Biljana

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  • Lončar, Biljana (3)
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Author's Bibliography

Discrete element model of particle transport and premixing action in modified screw conveyors

Pezo, Milada L.; Pezo, Lato; Jovanović, Aca; Terzić, Anja; Andrić, Ljubiša; Lončar, Biljana; Kojić, Predrag S.

(2018)

TY  - JOUR
AU  - Pezo, Milada L.
AU  - Pezo, Lato
AU  - Jovanović, Aca
AU  - Terzić, Anja
AU  - Andrić, Ljubiša
AU  - Lončar, Biljana
AU  - Kojić, Predrag S.
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0032591018304480
UR  - http://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 S.",
year = "2018",
url = "https://linkinghub.elsevier.com/retrieve/pii/S0032591018304480, http://vinar.vin.bg.ac.rs/handle/123456789/7719",
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. S. (2018). Discrete element model of particle transport and premixing action in modified screw conveyors.
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 PS. Discrete element model of particle transport and premixing action in modified screw conveyors. Powder Technology. 2018;336:255-264
Pezo Milada L., Pezo Lato, Jovanović Aca, Terzić Anja, Andrić Ljubiša, Lončar Biljana, Kojić Predrag S., "Discrete element model of particle transport and premixing action in modified screw conveyors" Powder Technology, 336 (2018):255-264,
https://doi.org/10.1016/j.powtec.2018.06.009 .
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DEM/CFD approach for modeling granular flow in the revolving static mixer

Pezo, Milada L.; Pezo, Lato; Jovanović, Aca; Lončar, Biljana; Čolović, Radmilo

(2016)

TY  - JOUR
AU  - Pezo, Milada L.
AU  - Pezo, Lato
AU  - Jovanović, Aca
AU  - Lončar, Biljana
AU  - Čolović, Radmilo
PY  - 2016
UR  - http://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.
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",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/1090",
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.",
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.
Chemical Engineering Research and Design, 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. Chemical Engineering Research and Design. 2016;109:317-326
Pezo Milada L., Pezo Lato, Jovanović Aca, Lončar Biljana, Čolović Radmilo, "DEM/CFD approach for modeling granular flow in the revolving static mixer" Chemical Engineering Research and Design, 109 (2016):317-326,
https://doi.org/10.1016/j.cherd.2016.02.003 .
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Modified screw conveyor-mixers - Discrete element modeling approach

Pezo, Lato; Jovanović, Aca; Pezo, Milada L.; Čolović, Radmilo; Lončar, Biljana

(2015)

TY  - JOUR
AU  - Pezo, Lato
AU  - Jovanović, Aca
AU  - Pezo, Milada L.
AU  - Čolović, Radmilo
AU  - Lončar, Biljana
PY  - 2015
UR  - http://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",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/755",
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.
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. Advanced Powder Technology. 2015;26(5):1391-1399
Pezo Lato, Jovanović Aca, Pezo Milada L., Čolović Radmilo, Lončar Biljana, "Modified screw conveyor-mixers - Discrete element modeling approach" Advanced Powder Technology, 26, no. 5 (2015):1391-1399,
https://doi.org/10.1016/j.apt.2015.07.016 .
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