Study on droplet freezing characteristic by ultrasonic

The application of ultrasound to liquid freezing has focused growing attention over the last few years and its potential seems very promising. In order to make clear droplet freezing assisted by ultrasonic, the freezing nucleation free energy of droplet was analyzed in effect of ultrasonic and un-ultrasonic. Droplet freezing was studied based on ultrasonic theory, penetration theory of mass transfer and energy conservation. Besides, solid–liquid interface position of droplet in the process of freezing for different droplet radius was studied to reflect the freezing process. The results showed that ultrasonic could be favor to droplet freezing, which could deduce freezing nucleation free energy of droplet. Larger ultrasonic frequency would deduce smaller freezing nucleation free energy, and larger ultrasonic intensity would cause droplet to be cool and freeze easily.