3. Model development for heat disinfestation
in a fluidized bed
Even though the thin-layer heat diffusion models discussed
above can provide temperature profiles inside grain
kernels, which is necessary for analyzing the mortality of
all insects inside grain kernels, they alone cannot sufficiently
describe the transport process phenomena in deep
bed grain disinfestations, such as fluidized bed disinfestation.
They must be incorporated into a deep bed simulation
model derived from mass and energy conservation laws.
Because there are differences in heat diffusion rates between
axial and radial directions, a paddy kernel was assumed to
be a cylindrical object, as discussed in Section 2, and a geometric
cylinder should be more appropriate than a spherical
shape for paddy. Thus, cylindrical coordinates of heat
diffusion equation were used in the simulation.