METHOD OF DRYING CAPILLARY-POROUS MATERIALS Russian patent published in 1994 - IPC

FIELD: drying materials. SUBSTANCE: ultrasonic vibrations are applied to material by amplitude modulation of electrical high-frequency oscillations by harmonic ultrasonic frequency oscillations selected according to the condition Ω=ω/Q_e, where ω is the frequency of electrical high-frequency vibrations; W is the frequency of modulation; and Q_e is the equivalent quality of circuit to which capillary-porous material is placed. The value of Ω is found according to the depth of modulation, which is about 70 ± 5% . EFFECT: facilitated drying of capillary-porous material containing free moisture. 1 dwg, 1 tbl