The heat transfer enhancement caused by the application of a low-frequency (1 ∼ 16 Hz) alternating field having the sinusoidal waveform has been studied experimentally with water drops in a medium of silicone oil. The heat transfer coefficient has been found to peak at three particular frequencies. The data newly obtained with the sinusoidal waveform are compared with earlier results obtained with electric fields having other waveforms. The waveform and the frequency that yield the largest enhancement of heat transfer are sought.

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