Describe the mechanism of drying technique. Elaborate on the types of drying process used for dehydration of foods.

Dehydration involves the simultaneous application of heat and removal of moisture from foods. Factors that control throughout the food processing are many and it varies for thermal drying. Some involve the removal of moisture or volatiles from various food ingredients or products that differ in both chemical and physical characteristics. Others involve the drying of solutions or liquid suspensions and different approaches to the problem.

Three basic methods of heat transfer are used in industrial dryers in varying degrees of prominence and combinations, specifically, convection, conduction, and radiation. In the food processing industry and dairy industry, the majority of dryers employ forced convection with continuous operation. With the exception of the indirectly heated rotary dryer and the film drum dryer, units in which heat is transferred by conduction are suitable only for batch use. This limitation effectively restricts them to applications involving somewhat modest production runs. Radiant, or "infrared," heating is rarely used in drying materials. Direct heating is used extensively ___ _____ ____ __________ __________ ___ _____ _______ __________ ______ ____.
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