The effect of an ultrasonic field on the heat transfer in a flash boiling system is reported. The amount of heat transfer per unit volume of fluid was found to be a function of the following parameters: liquid superheat, system pressure, and the impurities in the fluid. The introduction into the system of an ultrasonic field at a frequency of 26 kc and an electrical power input to the transducer of 40 w resulted in the formation of cavitation within the fluid. The presence of the cavitation under certain conditions resulted in a significant increase in the bubble turbulence in the system and the rate of heat transfer. The improvement was noted only when operating in specific ranges of the foregoing parameters and the fluid flow rate. The effects of fluid impurities were determined since both distilled and tap water were used as the working fluid.

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