超声波对冰盘管蓄冷成核温度的影响与分析

A Study on the Mechanism of Nucleation of Liquid Induced by Acoustic Cavitation

超声波具有促进冰晶成核的作用。为了降低冰盘管蓄冰时所需的过冷度(提高冰晶成核温度),在冰盘管蓄冷过程中引入低频高功率超声波。自水温降至0℃时,开始间歇施加超声波,并测量不同条件下的盘管蓄冰成核温度。结果显示,金属和塑料两种盘管在超声场中蓄冰的成核温度均被显著提高,但是超声波对金属盘管蓄冰成核温度的影响更大些。这表明超声波能够强化冰盘管的蓄冷过程,从而减少盘管蓄冰能耗。

Ultrasound can promote the nucleation of ice crystals. In order to reduce the undercooling required for ice storage of the coil(increase the nucleation temperature of ice crystal), ultrasonic waves are introduced in the process of ice coil storage. When the water temperature drops to 0℃, ultrasonic waves with low-frequency and high-power are applied to the cold storage process of coil. Ultrasonic waves were applied intermittently. The nucleation temperature of ice under different conditions is measured. The results show that The nucleation temperature of ice in cold storage process of ice-on-coil(metal coil and plastic coil) is increased under ultrasound. But ultrasonic waves have a greater effect on the nucleation of ice in cold storage process of metal coil. This shows that ultrasonic can strengthen the cold storage process of ice coil, so as to reduce the energy consumption of ice -on- coil.