Đuragić, Olivera

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  • Đuragić, Olivera (4)
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Author's Bibliography

Mathematical model, numerical simulation and optimization of rotating valve feeder in animal feed production

Pezo, Lato; Banjac, Vojislav; Pezo, Milada; Jovanović, Aca P.; Đuragić, Olivera; Čolović, Dušica; Čolović, Radmilo

(2021)

TY  - JOUR
AU  - Pezo, Lato
AU  - Banjac, Vojislav
AU  - Pezo, Milada
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 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., 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 M, 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, 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 . .

Experimental and computational study of the two-fluid nozzle spreading characteristics

Pezo, Milada L.; Pezo, Lato; Dragojlović, Danka; Čolović, Radmilo; Čolović, Dušica; Vidosavljević, Strahinja; Hadnađev, Miroslav; Đuragić, Olivera

(2021)

TY  - JOUR
AU  - Pezo, Milada L.
AU  - Pezo, Lato
AU  - Dragojlović, Danka
AU  - Čolović, Radmilo
AU  - Čolović, Dušica
AU  - Vidosavljević, Strahinja
AU  - Hadnađev, Miroslav
AU  - Đuragić, Olivera
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8921
AB  - Spray nozzles are widely used in processing industry for spreading evenly large amount of fluids. The expansion of fluid depends on the nozzle type, the parameters of the nozzle and the characteristics of the working fluids. The experiments were performed for five fluid types used in food/pharma/animal feed application (glycerol, soybean oil, molasses, hydroxypropyl methylcellulose, tara gum), three diameters of the nozzle (1 mm, 3 mm, 5 mm) and three fluid temperatures (40 °C, 50 °C and 60 °C). An experimentally validated numerical model was developed, based on laminar two-phase flow, investigating different liquids, assuming the ideal gas flow, applying the finite volume method and volume of the fluid model with interface tracking. The effects of liquid parameters, nozzle diameter and liquid temperature on the characteristics of the jet were also analysed by artificial neural network model. The nozzle diameter strongly influenced the spreading characteristics of the jet, while the temperature affected the liquid viscosity. The increase of the temperature also led to the augment of the spreading angle of the fluid passing from the nozzle and also the enhancement of the spaying liquid expansion. © 2020 Institution of Chemical Engineers
T2  - Chemical Engineering Research and Design
T1  - Experimental and computational study of the two-fluid nozzle spreading characteristics
VL  - 166
SP  - 18
EP  - 28
DO  - 10.1016/j.cherd.2020.11.027
ER  - 
@article{
author = "Pezo, Milada L. and Pezo, Lato and Dragojlović, Danka and Čolović, Radmilo and Čolović, Dušica and Vidosavljević, Strahinja and Hadnađev, Miroslav and Đuragić, Olivera",
year = "2021",
abstract = "Spray nozzles are widely used in processing industry for spreading evenly large amount of fluids. The expansion of fluid depends on the nozzle type, the parameters of the nozzle and the characteristics of the working fluids. The experiments were performed for five fluid types used in food/pharma/animal feed application (glycerol, soybean oil, molasses, hydroxypropyl methylcellulose, tara gum), three diameters of the nozzle (1 mm, 3 mm, 5 mm) and three fluid temperatures (40 °C, 50 °C and 60 °C). An experimentally validated numerical model was developed, based on laminar two-phase flow, investigating different liquids, assuming the ideal gas flow, applying the finite volume method and volume of the fluid model with interface tracking. The effects of liquid parameters, nozzle diameter and liquid temperature on the characteristics of the jet were also analysed by artificial neural network model. The nozzle diameter strongly influenced the spreading characteristics of the jet, while the temperature affected the liquid viscosity. The increase of the temperature also led to the augment of the spreading angle of the fluid passing from the nozzle and also the enhancement of the spaying liquid expansion. © 2020 Institution of Chemical Engineers",
journal = "Chemical Engineering Research and Design",
title = "Experimental and computational study of the two-fluid nozzle spreading characteristics",
volume = "166",
pages = "18-28",
doi = "10.1016/j.cherd.2020.11.027"
}
Pezo, M. L., Pezo, L., Dragojlović, D., Čolović, R., Čolović, D., Vidosavljević, S., Hadnađev, M.,& Đuragić, O.. (2021). Experimental and computational study of the two-fluid nozzle spreading characteristics. in Chemical Engineering Research and Design, 166, 18-28.
https://doi.org/10.1016/j.cherd.2020.11.027
Pezo ML, Pezo L, Dragojlović D, Čolović R, Čolović D, Vidosavljević S, Hadnađev M, Đuragić O. Experimental and computational study of the two-fluid nozzle spreading characteristics. in Chemical Engineering Research and Design. 2021;166:18-28.
doi:10.1016/j.cherd.2020.11.027 .
Pezo, Milada L., Pezo, Lato, Dragojlović, Danka, Čolović, Radmilo, Čolović, Dušica, Vidosavljević, Strahinja, Hadnađev, Miroslav, Đuragić, Olivera, "Experimental and computational study of the two-fluid nozzle spreading characteristics" in Chemical Engineering Research and Design, 166 (2021):18-28,
https://doi.org/10.1016/j.cherd.2020.11.027 . .
1

Application of soybean oil and glycerol in animal feed production, ANN model

Dragojlović, Danka; Pezo, Lato; Čolović, Dušica; Vidosavljević, Strahinja; Pezo, Milada L.; Čolović, Radmilo; Kokić, Bojana; Đuragić, Olivera

(2019)

TY  - JOUR
AU  - Dragojlović, Danka
AU  - Pezo, Lato
AU  - Čolović, Dušica
AU  - Vidosavljević, Strahinja
AU  - Pezo, Milada L.
AU  - Čolović, Radmilo
AU  - Kokić, Bojana
AU  - Đuragić, Olivera
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8821
AB  - In the past few decades the diet preparation in feed production has evolved towards more complicated technological operations, which include different liquid addition. A wide scale of different liquids is used in contemporary animal feed production, from oils and glycerol to more expensive products in a liquid form, such as enzymes, flavourings, amino acids, vitamins and others. In the presented study the liquid addition in feed production was observed, with a specific goal to investigate the spraying systems in order to better understand the effects of fluids, such as soybean oil and glycerol, on feed production. The dispersion angles of spraying nozzle for glycerol and soybean oil were determined as an indicator of the uniform application of liquids during feed production. Dispersion of the material was accomplished using the two-fluid nozzle. The performance of Artificial Neural Network (ANN) was compared with experimental data in order to develop rapid and accurate method for prediction of dispersion angle. The ANN model showed high prediction accuracy (r2 = 0.945).
T2  - Acta Periodica Technologica
T1  - Application of soybean oil and glycerol in animal feed production, ANN model
IS  - 50
SP  - 51
EP  - 58
DO  - 10.2298/APT1950051D
ER  - 
@article{
author = "Dragojlović, Danka and Pezo, Lato and Čolović, Dušica and Vidosavljević, Strahinja and Pezo, Milada L. and Čolović, Radmilo and Kokić, Bojana and Đuragić, Olivera",
year = "2019",
abstract = "In the past few decades the diet preparation in feed production has evolved towards more complicated technological operations, which include different liquid addition. A wide scale of different liquids is used in contemporary animal feed production, from oils and glycerol to more expensive products in a liquid form, such as enzymes, flavourings, amino acids, vitamins and others. In the presented study the liquid addition in feed production was observed, with a specific goal to investigate the spraying systems in order to better understand the effects of fluids, such as soybean oil and glycerol, on feed production. The dispersion angles of spraying nozzle for glycerol and soybean oil were determined as an indicator of the uniform application of liquids during feed production. Dispersion of the material was accomplished using the two-fluid nozzle. The performance of Artificial Neural Network (ANN) was compared with experimental data in order to develop rapid and accurate method for prediction of dispersion angle. The ANN model showed high prediction accuracy (r2 = 0.945).",
journal = "Acta Periodica Technologica",
title = "Application of soybean oil and glycerol in animal feed production, ANN model",
number = "50",
pages = "51-58",
doi = "10.2298/APT1950051D"
}
Dragojlović, D., Pezo, L., Čolović, D., Vidosavljević, S., Pezo, M. L., Čolović, R., Kokić, B.,& Đuragić, O.. (2019). Application of soybean oil and glycerol in animal feed production, ANN model. in Acta Periodica Technologica(50), 51-58.
https://doi.org/10.2298/APT1950051D
Dragojlović D, Pezo L, Čolović D, Vidosavljević S, Pezo ML, Čolović R, Kokić B, Đuragić O. Application of soybean oil and glycerol in animal feed production, ANN model. in Acta Periodica Technologica. 2019;(50):51-58.
doi:10.2298/APT1950051D .
Dragojlović, Danka, Pezo, Lato, Čolović, Dušica, Vidosavljević, Strahinja, Pezo, Milada L., Čolović, Radmilo, Kokić, Bojana, Đuragić, Olivera, "Application of soybean oil and glycerol in animal feed production, ANN model" in Acta Periodica Technologica, no. 50 (2019):51-58,
https://doi.org/10.2298/APT1950051D . .
1
1

The joint mixing action of the static pre-mixer and the rotating drum mixer – Discrete element method approach

Pezo, Lato; Pezo, Milada L.; Jovanović, Aca; Čolović, Radmilo; Vukmirović, Đuro; Banjac, Vojislav; Đuragić, Olivera

(2018)

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  - http://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 . .
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