標題: Effect of oscillatory EHD on the heat transfer performance of a flat plate
作者: Sheu, Wen-Junn
Hsiao, Jen-Jei
Wang, Chi-Chuan
機械工程學系
Department of Mechanical Engineering
關鍵字: Electrohydrodynamics;Ionic wind;Oscillatory EHD;Enhanced convection
公開日期: 1-Jun-2013
摘要: The present study investigates the effect of oscillatory EHD on the heat transfer performance of a flat plate. A needle type electrode with positive polarity is used to generate ionic wind with applied voltage ranging from 4 to 9.5 kV. The wave forms of the input voltage are either steady or stepped and the frequency ranges from 0.5 to 2 Hz with the separation distance between the electrode and the test plate being 5 and 15 mm, respectively. It is found that at the same applied voltage, the heat transfer performance subject to the oscillatory EHD is always inferior to that of the steady EHD for all frequencies. A parabolic dependence of the ionic current with the supplied voltage is seen under steady EHD operation. However, the ionic current vs. supplied voltage shows a rather linear dependence pertaining to the oscillatory EHD. For a smaller separation distance of 5 mm, the heat transfer performance for f = 0.5 Hz is slightly higher than that of f = 2 Hz. However, the trend is reversed when the separation distance is increased to 15 mm. (C) 2013 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.02.026
http://hdl.handle.net/11536/21636
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2013.02.026
期刊: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume: 61
Issue: 
起始頁: 419
結束頁: 424
Appears in Collections:Articles