The values of excitation shear stress for frosting cream from ultrasonic high-frequency vibration were calculated using the finite element software COMSOL

and compared with the maximum adhesion stress obtained theoretically to demonstrate the feasibility of ultrasonic high-frequency vibration defrosting technology. Meanwhile

the defrosting effects of three kinds of the vibration structure

i.e.

monoblock type

T-shaped and L-shaped

of a quick-freezing cooling fan were experimentally compared and analyzed under the conditions that cold storage temperature was 20 ℃

humidity was 95%

the ultrasonic frequency was 38.76 kHz

and the loading mechanism was vibrating 10 s for every 50 s. The results show that the ultrasonic has a significant inhibitory effect on the frost on the fin surface under the working condition of high humidity and low temperature

so that the quick-freezing cooling fan can operate for a long time continuously and its efficiency is significantly improved. In addition

the vibration with the structure of the monoblock type has better defrosting effect than that with T- and L-shaped.