Effect of Dual-frequency ultrasonic on subcooled water freezing

Abstract

Ultrasonic-assisted freezing has received much attention for its outstanding capability to improve freezing performance. However, most researchers focus only on single-frequency ultrasound, lacking research on dual-frequency or multi-frequency ultrasound. Based on the relevant theory of the promotion of solution crystallization by ultrasound wave, this paper experimentally studied the subcooling degree and time of water freezing under the action of ultrasound. The experimental study was carried out on the production of ice from water by using different ultrasonic waves under a specific power. The results show that the effect of ultrasound with specific frequency combinations can improve the speed of water freezing and reduce the subcooling degree. When the experimental conditions are 28+33 kHz and 60 W, the comprehensive performance is the best. Compared with the condition without ultrasound, the subcooling degree is reduced by 5.28 K, and the time required for the complete solidification of water into ice was reduced by a duration of 60 s.