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4.4 Influences of ultrasound output powerThe same conditions as mentioned in Section 4.1and Section 4.2, 20 kHz, 80°C, the influences of ultrasoundoutput power were also studied.There was an optimal value of ultrasound outputpower as shown in Fig. 5, which was about 150 W.The ultrasonic irradiation condition was very importantin the whole process. There were two mechanismsthat could explain the ultrasonic influences. (1) Aggregatingeffect. The water drops aggregated with theultrasound irradiation, which was helpful to the emulsiondemulsify. (2) Cavitation effect. The ultrasoundcavitation had the emulsification affection. When theintensity of ultrasound was below the cavitationthreshold, the aggregation appeared, the results of ultrasoundirradiation being demulsified. When the intensityof ultrasound increased over the cavitationthreshold, the results of ultrasound irradiation wereshown as emulsification.
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