The augmentation of direct heat removal from small-scale heating elements by an electrohy drodynamically (EHD)-induced flow was experimentally investigated. The shape of electrodes, polarity, electric field strength and electric conductivity of a working fluid were systematically changed to clarify the heat transfer mechanism. By applying electric field, the increase of the heat transfer coefficient of FC-72 (CFC) for a 25 mm2 heating element was enhanced 1.8 times at maximum compared to those with no electric field. For a 0.25 mm2 heating element, it remained at 1.2 times. However, the heat transfer coefficient for the 0.25 mm2 heating element is about 15 times greater compared with that for 25 mm2 due to the fin effect of the substrate. By using a mixture of R113 and ethanol, the heat transfer coefficient was increased about 10 times at maximum compared to those with no electric field, which was proportional to the power consumption.
|ジャーナル||Transactions of the Japan Society of Mechanical Engineers Series B|
|出版ステータス||Published - 1994|
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