Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31093
Numerical Investigation of the Chilling of Food Products by Air-Mist Spray

Authors: Roy J. Issa


Spray chilling using air-mist nozzles has received much attention in the food processing industry because of the benefits it has shown over forced air convection. These benefits include an increase in the heat transfer coefficient and a reduction in the water loss by the product during cooling. However, few studies have simulated the heat transfer and aerodynamics phenomena of the air-mist chilling process for optimal operating conditions. The study provides insight into the optimal conditions for spray impaction, heat transfer efficiency and control of surface flooding. A computational fluid dynamics model using a two-phase flow composed of water droplets injected with air is developed to simulate the air-mist chilling of food products. The model takes into consideration droplet-to-surface interaction, water-film accumulation and surface runoff. The results of this study lead to a better understanding of the heat transfer enhancement, water conservation, and to a clear direction for the optimal design of air-mist chilling systems that can be used in commercial applications in the food and meat processing industries.

Keywords: droplet size, Droplets impaction efficiency, Heat transfer enhancement factor, Water runoff

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1677


[1] G. Alvarez, and D. Flick, "Analysis of Heterogeneous Cooling of Agricultural Products Inside Bins - Part I: Aerodynamic Study," Journal of Food Engineering, vol. 39, no. 3, pp. 227-237, 1999.
[2] G. Alvarez, and D. Flick, "Analysis of Heterogeneous Cooling of Agricultural Products Inside Bins - Part II: Thermal Study," Journal of Food Engineering, vol. 39, no. 3, pp. 239-245, 1999.
[3] F. A. Ansari, and S. Y. Khan, "Application Concept of Variable Effective Surface Film Conductance for Simultaneous Heat and Mass Transfer Analysis during Air Blast Cooling of Food," Energy Conversion and Management, vol. 40, no. 5, pp. 567-574, 1999.
[4] S. Chuntranuluck, C. M. Wells, and A. C. Cleland, "Prediction of Chilling Times of Foods in Situations Where Evaporative Cooling is Significant - Part 2. Experimental Testing," Journal of Food Engineering, vol. 37, no. 2, pp. 127-141, 1998.
[5] C. Dirita, M. V. De Bonis, and G. Ruocco, "Analysis of Food Cooling by Jet Impingement Including Inherent Conduction," Journal of Food Engineering, vol. 81, no. 1, pp. 12-20, 2007.
[6] I. Allais, G. Alvarez, and D. Flick, "Modeling Cooling Kinetics of a Stack of Spheres During Mist Chilling," Journal of Food Engineering, vol. 72, no. 2, pp. 197-209, 2006.
[7] I. Allais, and G. Alvarez, "Analysis of Heat Transfer During Mist Chilling of a Packed Bed of Spheres Simulating Foodstuffs," Journal of Food Engineering, vol. 49, no. 1, pp. 37-47, 2001.
[8] P. M. Abdul Majeed, P.M., "Analysis of Heat Transfer during Hydrair Cooling of Spherical Food Products," International Journal of Heat and Mass Transfer, vol. 24, pp. 323-333, 1981.
[9] P. Mallikarjunan, and G. S. Mittal, "Heat and Mass Transfer during Beef Carcass Chilling - Modeling and Simulation," Journal of Food Engineering, vol. 23, no. 2, pp. 277-292, 1994.
[10] A. Kuitche, and J. D. Daudin, "Modeling of Temperature and Weight Loss Kinetics during Meat Chilling for Time-Variable Conditions using an Analytical-Based Method - I. The Model and its Sensitivity to Certain Parameters," Journal of Food Engineering, vol. 28, no. 1, pp. 55-84, 1996.
[11] S. D. M. Jones, and W. M. Robertson, "The Effects of Spray-Chilling Carcasses on the Shrinkage and Quality of Beef," Meat Science, vol. 24, no. 3, pp. 177-188, 1988.
[12] K. J. Kinsella, J. J. Sheridan, T. A. Rowe, F. Butler, A. Delgado, A. Q. Ramirez, I. S. Blair, and D. A. McDowell, "Impact of a Noval Spray- Chilling System on Surface Microflora, Water Activity and Weight Loss during Beef Carcass Chilling," Food Microbiology, vol. 23, no. 5, pp. 483-490, 2006.
[13] P. E. Strydom, and E. M. Buys, "The Effects of Spray-Chilling on Carcass Mass Loss and Surface Associated Bacteriology," Meat Science, vol. 39, no. 2, pp. 265-276, 1995.
[14] M. Fabbri, S. Jiang, and V. K. Dhir, "Comparative Study of Spray and Multiple Micro Jets Cooling for High Power Density Electronic Applications," Proceedings of IMECE-03, 2003 ASME International Mechanical Engineering Congress and Exposition, Washington, D.C.
[15] J. J. Spillman, "Spray Impaction, Retention and Adhesion: an Introduction to Basic Characteristics," Pesticide Science, vol. 15, no. 2, pp. 97-106, 1984.
[16] M. Schatzmann, "Wind Tunnel Modeling of Fog Droplet Deposition on Cylindrical Obstacles," Journal of Wind Engineering and Industrial Aerodynamics, vol. 83, no. 1, pp. 371-380, 1999.
[17] R. J. Issa, and S. C. Yao, "A Numerical Model for Spray-Wall Impactions and Heat Transfer at Atmospheric Conditions," Journal of Thermophysics and Heat Transfer, vol. 19, no. 4, pp. 441-447, 2005.
[18] R. J. Issa, and S. C. Yao, "Modeling of the Mist Dynamics and Heat Transfer at Various Ambient Pressures," 2004 ASME Heat Transfer/Fluids Engineering Summer Conference.
[19] D. W. Stanton, and C. J. Rutland, "Multi-Dimensional Modeling of Thin Liquid Films and Spray-Wall Interactions Resulting from Impinging Sprays," Int. J. Heat Mass Transfer, vol. 41, no. 20, pp. 3037-3054, 1998.