Microwave vacuum drying kinetics of three fruits (namely, apple, kiwi
and pear) were studied by introducing an one-parameter empirical mass
transfer model, involving a characteristic parameter (drying constant)
, as a function of process variables. The model was tested with data p
roduced in a microwave oven equipped with vacuum apparatus, using non-
linear regression analysis. The investigation involved a wide range of
microwave power and vacuum pressure levels. The parameters of the mod
el considered were found to be greatly affected by the microwave power
level while vacuum pressure affected slightly the process.