During conventional heated air drying, moisture is initially removed from thesurface and water from interior of the product moves to the drying surface throughdiffusion. Microwave drying is associated with the volumetric heat generation leading tohigher internaI temperatures and an increased internaI vapour pressure which helps topush liquid flow towards the surface, making it possible for higher drying rates.Microwave drying is reported to provide very high specific drying capacity of up to 50W/cm3 [20]. Additionally, various researchers report that it is efficient to use microwaveenergy than conventional drying in the falling drying rate period especially whenmicrowave dryer is used in combination with systems such as heat pumps [21].
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