The laboratory scale microwave-vacuum dryer in which
the materials to be dried can be rotated in the cavity was
used (School of Mechanical Engineering in Jiangnan University,
China) (Cui et al., 2003). Samples dried in the MVD cavity
are subjected to a microwave field at 2450 MHz. The rotation
speed of the turntable was 5 rpm. The highest microwave
power of this equipment was 270 W. A schematic diagram of
the vacuum microwave dryer is presented in Fig. 1.