Temperature influence is weakened in DCU and TCU, and dual-factor effect is stronger, the energy efficiency in DCU is higher than in SFU and TCU.

• 双频复合超声浸取和三频复合超声浸取可以弱化温度因素的影响,而且双因素的共同作用更突出; 双频复合超声的能量效率比单频超声和三频复合超声高。