The present paper investigates the effect of ultrasonic vibrations on the melting process of a phase change material (PCM). Furthermore, the present study considers constant heat-flux boundary conditions, whereas much of the pre- vious research had adopted constant wall-temperature conditions. The experimental results revealed that ultrasonic vibrations accompanied the effects like agitation, acoustic streaming, cavitation, and oscillating fluid motion, accel- erating the melting process as much as 2.5 times, compared to the rate of natural melting(i.e., the case without ul- trasonic vibration). In addition, temperature and Nusselt numbers over time provided conclusive evidence of the important role of the ultrasonic vibrations on the melting phenomena of the PCM.
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