Abstract
In view of the fact that food freezing is caused by freezing of the water solution in the food, a new heat conduction equation including phase equilibrium relationship is introduced. In this equation the modified thermal diffusivity is related to the temperature, and the diffusion equation for unsteady heat conduction shows intense non-linearity. Computation was based on the weighted residual (collocation) method. The calculated results were agreed well with the experimental data. It is expected that this result would be useful for frozen food operations.
