A 3-D computational fluid dynamics model for forced air cooling of eggs placed in trays

Freshly laid shell eggs must be cooled quickly for controlling Salmonella Enteritidis (SE) growth. To fulfill a research need identified by Food Safety and Inspection Service (FSIS), a 3-D computational fluid dynamics (CFD) model was developed to predict the temperature of eggs placed on a tray (6 rows x 5 columns) under forced air cooling. The continuity, momentum, and energy equations were solved along with standard k - epsilon turbulence model using PHOENICS software. The model was validated by conducting experiments in a wind tunnel at various air temperatures (7-11 degrees C) and velocities (0.3-0.7 m/s). Root mean square error for predicting yolk temperatures was within 1 degrees C. Finally, the CFD model was integrated with a microbial growth model to estimate the risk of SE growth during cooling. This model can be incorporated into the FSIS risk assessment model for more accurate estimation of SE risk in shell eggs. (C) 2011 Elsevier Ltd. All rights reserved.