TEMPERATURE DISTRIBUTION ANALYSIS IN PARALLEL PLATE TREATMENT CHAMBER FOR PULSED ELECTRIC FIELD PROCESSING: NUMERICAL STUDY
Keywords:Flow pattern, Numerical simulation, Parallel plate treatment chamber, PEF, Temperature distribution
Studies on temperature distribution in parallel plate treatment chambers are limited due to its design which is more prone to arcing, thus, neglecting its use in continuous processing. Therefore, this study discusses the temperature distribution due to Joule heating in a parallel plate treatment chamber acting in continuous mode. The numerical results predict that at a slow flow rate (i.e., 0.0234 cm3/s), the fluid flow near the chamber wall is in a static state (0 cm/s), thus, increasing its residence time and resulting in receiving more pulses. In this situation, the temperature increased dramatically from 25 °C (inlet temperature) to approximately 58 °C, i.e., 132 % increment. On the other hand, a slight increase in temperature (i.e., < 27 °C) is predicted by numerical simulation at a higher flow rate (i.e., 0.138 cm3/s) at the same location (near the chamber wall). This less rise is due to the low residence time which causes the liquid to quickly leave the treatment area, thus, getting less pulse. The temperature soar in this condition is very low which is approximately 8 % of the inlet temperature. From the results obtained, flow rate control helps to reduce the temperature rise, thus, keeping the temperature at ambient temperature or slightly above the ambient and at the same time reducing the risk of the treated media from experiencing adverse effects on its physical attributes as a result of high temperatures.
Castro, Armando J., Gustavo V. Barbosa‐Cánovas, and Barry G. Swanson. 1993"Microbial inactivation of foods by pulsed electric fields." Journal of Food Processing and Preservation 17(1): 47-73.
Barbosa-Cánovas, Gustavo V., et al. 1999.Preservation Of Foods With Pulsed Electric Fields. Elsevier,
Mohamed, Maged EA, and Ayman H. Amer Eissa. 2012 "Pulsed electric fields for food processing technology." Structure And Function Of Food Engineering 11: 275-306.
Gulyi, I. S., et al. 1994. "Scientific and practical principles of electrical treatment of food products and materials." Kiev: UkrINTEI (in Russian)
Barsotti, L., and J. C. Cheftel. 1999"Food processing by pulsed electric fields. II. Biological aspects." Food Reviews International 15(2): 181-213.
Zimmermann, U., et al. 1976 "Effects of external electrical fields on cell membranes." Bioelectrochemistry And Bioenergetics 3(1): 58-83.
Benz, R., F. Beckers, and U. Zimmermann. 1979"Reversible electrical breakdown of lipid bilayer membranes: a charge-pulse relaxation study." The Journal of membrane biology 48(2): 181-204.
Benz, R., and U. Zimmermann. 1980"Pulse-length dependence of the electrical breakdown in lipid bilayer membranes." Biochimica et Biophysica Acta (BBA)-Biomembranes 597(3): 637-642.
Chang, Donald C., and Thomas S. Reese. 1990 "Changes in membrane structure induced by electroporation as revealed by rapid-freezing electron microscopy." Biophysical journal 58(1): 1-12.
Zhang, Qinghua, Gustavo V. Barbosa-Cánovas, and Barry G. Swanson. 1995"Engineering aspects of pulsed electric field pasteurization." Journal of food engineering 25(2): 261-281.
Lindgren, Martin, et al. 2002 "Simulation of the temperature increase in pulsed electric field (PEF) continuous flow treatment chambers." Innovative Food Science & Emerging Technologies 3(3): 233-245.
Barbosa-Cánovas, Gustavo V., and Bilge Altunakar. 2006 "Pulsed electric fields processing of foods: an overview." Pulsed electric fields technology for the food industry.3-26.
Masood, Hassan, et al. 2018 "A comparative study on the performance of three treatment chamber designs for radio frequency electric field processing." Computers & Chemical Engineering 108: 206-216.
Krasuchi, Z. 1968. "Breakdown of commercial liquid and liquid-solid dielectrics." High voltage technology, Alston LL (Ed), 122-128. Oxford University Press, London, UK
Chen, Xiao Dong. 2006."Modeling thermal processing using computational fluid dynamics (CFD)." SUN, DW Thermal food processing: new technologies and quality issues. Boca Raton: CRC
Schroeder, Stefanie, Roman Buckow, and Kai Knoerzer. 2009. "Numerical simulation of pulsed electric field (PEF) processing for chamber design and optimization." International Conference on CFD in the Minerads and Process Industries CSIRO, 17th, Australia.
Buckow, Roman, et al. 2010 "Simulation and evaluation of pilot-scale pulsed electric field (PEF) processing." Journal of Food Engineering 101(1): 67-77.
Masood, Hassan, et al. 2018"A comparative study on the performance of three treatment chamber designs for radio frequency electric field processing." Computers & Chemical Engineering 108: 206-216.
Jeyamkondan, S., D. S. Jayas, and R. A. Holley. 1999"Pulsed electric field processing of foods: a review." Journal Of Food Protection 62(9): 1088-1096.
Bird, R. Byron. 2002"Transport phenomena." Appl. Mech. Rev. 55(1): R1-R4.
Gerlach, D., et al. 2008"Numerical simulations of pulsed electric fields for food preservation: a review." Innovative Food Science & Emerging Technologies 9(4): 408-417.
Jaeger, Henry, et al. 2010"Model for the differentiation of temperature and electric field effects during thermal assisted PEF processing." Journal of Food Engineering 100(1): 109-118.
Morales-de La Peña, M., P. Elez-Martínez, and O. Martín-Belloso. 2011 "Food preservation by pulsed electric fields: an engineering perspective." Food Engineering Reviews 3(2): 94-107.
Ho, S. Y., G. S. Mittal, and J. D. Cross. 1997 "Effects of high field electric pulses on the activity of selected enzymes." Journal of food engineering 31(1): 69-84.
S. Y. Ho, G. S. Mittal, and J. D. Cross, 1999, “Effects of high field electric pulses on the activity of selected enzymes,” J. Food Eng., 1997Versavel, J. 1999. Road Safety Through Video Detection. Intelligent Transportation System, Proceedings 1999 IEEE/IEEJ/JSAI International Conference. 753-757.