Commercial software COMSOL Multiphysics (Burlington, MA,
USA) was chosen in this study because of its ability to model the
electric field patterns and heat transfer through solving partial differential
equations. Although other software could be used for analyzing
electric field distributions in RF cavities (Chan et al., 2004),
COMSOL had been used successfully for modeling RF heating of
packaged foods (Wang et al., 2008a).
2.5. Assumptions
In order to accomplish an acceptable accuracy on the computer
available for this simulation (Dell Precision 870 workstation, 2
Dual-Core 2.80 GHz Intel Xeon™ Processors and 12 GB memory),
several assumptions were made to simplify the heating system.
First, a quasi–static analysis was assumed. Second, the flow of circulating
water inside the pressure vessel and the heat transfer between
circulating water and food were neglected. Third, only six
meatballs and two layers of noodles were included in the model
computations as shown in Fig. 3. Four meatballs were arranged
at the center of the tray to investigate the electric field distribution.
Commercial software COMSOL Multiphysics (Burlington, MA,USA) was chosen in this study because of its ability to model theelectric field patterns and heat transfer through solving partial differentialequations. Although other software could be used for analyzingelectric field distributions in RF cavities (Chan et al., 2004),COMSOL had been used successfully for modeling RF heating ofpackaged foods (Wang et al., 2008a).2.5. AssumptionsIn order to accomplish an acceptable accuracy on the computeravailable for this simulation (Dell Precision 870 workstation, 2Dual-Core 2.80 GHz Intel Xeon™ Processors and 12 GB memory),several assumptions were made to simplify the heating system.First, a quasi–static analysis was assumed. Second, the flow of circulatingwater inside the pressure vessel and the heat transfer betweencirculating water and food were neglected. Third, only sixmeatballs and two layers of noodles were included in the modelcomputations as shown in Fig. 3. Four meatballs were arrangedat the center of the tray to investigate the electric field distribution.
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