Experimental Study of the Effect of Ultrasound on the Freezing Process of Bo Chinh Ginseng

The main purpose of this study was to select the appropriate ultrasound parameters that support freezing process Bo Chinh ginseng. This involves placing ginseng in an open-air environment and ensuring transducer does not come into contact with material. research results show power, irradiation temperature intermittency ratio all affect time, nucleation temperature, color microstructure materials. When continuously operated during process, at a frequency 20 kHz, there 29.1% reduction time power level 100 W as compared without help irradiation. have linear relationship (y=−0.35x−0.93) which can control thereby changing ice crystal size. Ultrasound-assisted 0.6 had shortest time. material changed after ultrasound-assisted many microchannels holes were generated. frozen wave rate 0.4, created effectively supported water drainage drying sublimation stage. At same did post-freezing when undergo