Abstract
An investigation was made to determine the increase in drying rate which could be obtained through the addition of ultrasound to low temperature drying of heat sensitive fine particles. Airbourne ultrasound having a frequency of 20 kHz with intensities up to 155 dB was used. The materials dried included fine, sulphur-free powder coal, plastics powders, and neutralized acid mine drainage sludge. The limitations of the use of ultrasound in assisting drying were also studied. Theories are proposed to explain both the ultrasonic enhancement of drying and the limitations found.
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