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 . .

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  - 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 . .

TY  - JOUR
AU  - Banjac, Vojislav
AU  - Pezo, Lato
AU  - Pezo, Milada L.
AU  - Vukmirović, Đuro
AU  - Čolović, Dušica
AU  - Fišteš, Aleksandar
AU  - Čolović, Radmilo
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1492
AB  - In this study, sunflower meal is ground by a hammer mill after which air zigzag gravitational air classifier is used for separating sunflower hulls from the kernels in order to obtain protein rich fractions. Three hammer mill sieves with sieve openings diameter of 3, 2 and 1 mm were used, while three air flows (5, 8.7 and 12.5 m(3)/h) and three feed rates (30%, 60% an 90% of bowl feeder oscillation maximum rate) were varied during air classification process. For describing the effects of the test variables on the observed responses Principal Component Analysis, Standard Score analysis and Response Surface Methodology were used. Beside experimental investigations, CFD model was used for numerical optimization of sunflower meal air classification process. Air classification of hammer milled sunflower meal resulted in coarse fractions enriched in protein content. The decrease in sieve openings diameter of the hammer mill sieve increased protein content in coarse fractions of sunflower meal obtained at same air flow, and at the same time decreased matching fraction yield. Increase in air flow lead to the increase in protein content along the same hammer mill sieve. Standard score analysis showed that optimum values for protein content and ratio of coarse and fine fractions have been obtained by using a sieve with 1 mm opening diameter, air flow of 12.5 m(3)/h and 60% of the maximum feeder rate. Fraction ratio and protein content were mostly affected by the linear term of air flow and the sieve openings diameter of the hammer mill sieve in the Second Order Polynomial model. The main focus of CFD analysis was on the particle simulation and the evaluation of the separation efficiency of the zigzag classifier. (C) 2017 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  - Optimization of the classification process in the zigzag air classifier for obtaining a high protein sunflower meal - Chemometric and CFD approach
VL  - 28
IS  - 3
SP  - 1069
EP  - 1078
DO  - 10.1016/j.apt.2017.01.013
ER  - 

@article{
author = "Banjac, Vojislav and Pezo, Lato and Pezo, Milada L. and Vukmirović, Đuro and Čolović, Dušica and Fišteš, Aleksandar and Čolović, Radmilo",
year = "2017",
abstract = "In this study, sunflower meal is ground by a hammer mill after which air zigzag gravitational air classifier is used for separating sunflower hulls from the kernels in order to obtain protein rich fractions. Three hammer mill sieves with sieve openings diameter of 3, 2 and 1 mm were used, while three air flows (5, 8.7 and 12.5 m(3)/h) and three feed rates (30%, 60% an 90% of bowl feeder oscillation maximum rate) were varied during air classification process. For describing the effects of the test variables on the observed responses Principal Component Analysis, Standard Score analysis and Response Surface Methodology were used. Beside experimental investigations, CFD model was used for numerical optimization of sunflower meal air classification process. Air classification of hammer milled sunflower meal resulted in coarse fractions enriched in protein content. The decrease in sieve openings diameter of the hammer mill sieve increased protein content in coarse fractions of sunflower meal obtained at same air flow, and at the same time decreased matching fraction yield. Increase in air flow lead to the increase in protein content along the same hammer mill sieve. Standard score analysis showed that optimum values for protein content and ratio of coarse and fine fractions have been obtained by using a sieve with 1 mm opening diameter, air flow of 12.5 m(3)/h and 60% of the maximum feeder rate. Fraction ratio and protein content were mostly affected by the linear term of air flow and the sieve openings diameter of the hammer mill sieve in the Second Order Polynomial model. The main focus of CFD analysis was on the particle simulation and the evaluation of the separation efficiency of the zigzag classifier. (C) 2017 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 = "Optimization of the classification process in the zigzag air classifier for obtaining a high protein sunflower meal - Chemometric and CFD approach",
volume = "28",
number = "3",
pages = "1069-1078",
doi = "10.1016/j.apt.2017.01.013"
}

Banjac, V., Pezo, L., Pezo, M. L., Vukmirović, Đ., Čolović, D., Fišteš, A.,& Čolović, R.. (2017). Optimization of the classification process in the zigzag air classifier for obtaining a high protein sunflower meal - Chemometric and CFD approach. in Advanced Powder Technology, 28(3), 1069-1078.
https://doi.org/10.1016/j.apt.2017.01.013

Banjac V, Pezo L, Pezo ML, Vukmirović Đ, Čolović D, Fišteš A, Čolović R. Optimization of the classification process in the zigzag air classifier for obtaining a high protein sunflower meal - Chemometric and CFD approach. in Advanced Powder Technology. 2017;28(3):1069-1078.
doi:10.1016/j.apt.2017.01.013 .

Banjac, Vojislav, Pezo, Lato, Pezo, Milada L., Vukmirović, Đuro, Čolović, Dušica, Fišteš, Aleksandar, Čolović, Radmilo, "Optimization of the classification process in the zigzag air classifier for obtaining a high protein sunflower meal - Chemometric and CFD approach" in Advanced Powder Technology, 28, no. 3 (2017):1069-1078,
https://doi.org/10.1016/j.apt.2017.01.013 . .