Enhancement of Heat Transfer Performance Using Ultrasonic Evaporation

Abstract

AbstractThe ultrasonic evaporator is a new type of evaporation equipment which uses ultrasonic technology to assist evaporation of liquid materials. Due to the lack of mechanism of ultrasonic technology to enhance the heat transfer in evaporation process, there are few reports on the use of ultrasonic evaporator in industrial production. The tap water was selected as experimental material and the heat transfer performance of ultrasonic evaporator was studied. It could be obtained from the single factor analysis that the heat transfer coefficient increased first and then decreased with the increase of ultrasonic power density. The increase of heat transfer due to the increase of temperature difference is basically stable at 20 %. When the ultrasonic wave acts on evaporator, the heat transfer coefficient would increase about 17.06 %–29.85 %. According to the orthogonal test and analysis of variance, it can be obtained that the influence of temperature difference on heat transfer coefficient is the largest, the second is feed flow rate, and evaporation time has the least influence.