STUDY OF A HYDROFLUIDIZATION SYSTEM USING COMPUTATIONAL FLUID DYNAMICS AND A DISCRETE ELEMENT METHOD II: HEAT TRANSFER AND TURBULENCE INTENSITY

STUDY OF A HYDROFLUIDIZATION SYSTEM USING COMPUTATIONAL FLUID DYNAMICS AND A DISCRETE ELEMENT METHOD II: HEAT TRANSFER AND TURBULENCE INTENSITY

ORONÁ, J. D.; ZORRILLA, S. E.; PERALTA, J. M.

Artigo:

ABSTRACT. Hydrofluidization (HF) is a method of chilling and freezing of foods that pumps a refrigerating liquid upwards through orifices into a vessel creating submerged jets and thus results in extremely high surface transfer phenomena. The objective was to model the heat transfer and turbulence intensity in a HF system with spheres through computational fluid dynamics and a discrete element method. The HF system and the operative variables were those used in a companion paper presented as Part I. The independence of the mesh was checked. The heat transfer model was validated using data from a previous study with static spheres. The results were in the range of experimental data obtained in similar conditions. The model proposed provides useful information about the relationship between the operative variables and the heat transfer and turbulence levels in a HF system.

ABSTRACT. Hydrofluidization (HF) is a method of chilling and freezing of foods that pumps a refrigerating liquid upwards through orifices into a vessel creating submerged jets and thus results in extremely high surface transfer phenomena. The objective was to model the heat transfer and turbulence intensity in a HF system with spheres through computational fluid dynamics and a discrete element method. The HF system and the operative variables were those used in a companion paper presented as Part I. The independence of the mesh was checked. The heat transfer model was validated using data from a previous study with static spheres. The results were in the range of experimental data obtained in similar conditions. The model proposed provides useful information about the relationship between the operative variables and the heat transfer and turbulence levels in a HF system.

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DOI: 10.5151/chemeng-cobeq2014-1879-17066-170369

Referências bibliográficas

• [1] BELIS, E. E.; ZORRILLA, S. E.; PERALTA, J. M. Fenómenos de transporte en un sistema de hidrofluidización afectado por el número de orificios y las variables operativas. In: IV Congreso Internacional de Ciencia y Tecnología de los Alimentos (CICYTAC 2012), Nov. 14-16, Córdoba, Argentina, 2012.
• [2] CUNDALL, P. A.; STRACK, D. L. A discrete numerical model for granular assemblies. Géotechnique, v. 29, p. 47‒65, 1979.
• [3] FIKIIN, A. G. New method and fluidized water system for intensive chilling and freezing of fish. Food Control, v. 3, p. 153–160. 1992.
• [4] FLUENT. Theory guide. ANSYS-FLUENT 14.1. Canonsburg: ANSYS Inc., 2011.
• [5] GREEN, D.; PERRY, R. Perry''s chemical engineers'' handbook. Eighth edition. New York: McGraw-Hill, 2008 ORONÁ, J. D.; ZORRILLA, S. E.; PERALTA, J. M. Study of a hydrofluidization system using computational fluid dynamics and a discrete element method I: flow field and velocity profiles. In: XX Congresso Brasileiro de Engenharia Química (COBEQ), Oct. 19-22, Florianópolis, Brazil, 2014.
• [6] PERALTA, J. M.; RUBIOLO, A. C.; ZORRILLA, S. E. Mathematical modeling of the heat and mass transfer in a stationary potato sphere impinged by a single round liquid jet in a hydrofluidization system. J. Food Eng., v. 109, p. 501–512, 2012.
• [7] Acknowledgments This research was supported partially by Universidad Nacional del Litoral (Santa Fe, Argentina), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT).

Como citar:

ORONÁ, J. D.; ZORRILLA, S. E.; PERALTA, J. M.; "STUDY OF A HYDROFLUIDIZATION SYSTEM USING COMPUTATIONAL FLUID DYNAMICS AND A DISCRETE ELEMENT METHOD II: HEAT TRANSFER AND TURBULENCE INTENSITY", p-5046-5052. In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 23591757, DOI 10.5151/chemeng-cobeq2014-1879-17066-170369