In recent years considerable investigations have been
done on drying of grains, plants and other agricultural
products. Simal, Berna, Mulet, and Rossello´ (1993) proposed
a method for determination of heat transfer coefficient
for the first falling period of potato cubes. In their
study heat and mass transfer were considered as coupled
phenomena. It was claimed that the obtained heat transfer
coefficient is in good agreement with previous studies. The
heat transfer coefficient is influenced by parameters such as
thermal fluid velocity, the physical properties of fluid, the
temperature difference between the fluid and the target
material, and the characteristics of the physical system
under consideration (Singh & Heldman, 1984).