“…A number of papers deal with modeling the vacuum drying of foods. [17][18][19][20] One complication is that there can be several mechanisms involved in the transfer of moisture during vacuum drying of foodstuffs. [21] These include bulk diffusion of liquid, surface diffusion, capillary forces that pull water through narrow tube structures, Knudsen diffusion through long pores, water vapor diffusion due to vapor pressure gradients, and vapor flux due to total pressure differences.…”