Numerical Analysis of Double Acting and Single Synthetic Jet
Date Issued
2006
Date
2006
Author(s)
Lee, Chyi-Lin
DOI
zh-TW
Abstract
In the backlight module industry, light emitted diode has already been an inevitable trend to replace the cold cathode light, because of characteristics such as the low voltage of urging, no mercury, and high color reproduction. In order to reach the demand for the high intensity of illumination, we should resolve the problem of density of high fever emerging in the diode which will influence the performance of LCD system. Because LCD has limited space and needs low noise, “synthetic jet” is an extremely potential active heat dissipation component possessing the characteristics such as simple structure and easy control. This article uses operating frequency and amplitude of moving boundary to define three main dimensionless parameters—Re,St,and S. After analyzing simulation results, we get two conclusions. On the one hand, increasing St will strengthen the structure of vortex ring and enhance thrusting efficiency. On the other hand, increasing S will enhance the intensity of vortex and increase the jet speed. Under the optimum premise, large amplitude and high frequency, the design of double acting for improving the steady jet region of single synthetic jet is limited. However, the near field of double acting synthetic jet has more concentrating velocity, higher speed, and longer high speed region than single synthetic jet. Therefore, it will have better performance on the application of impinging cooling. In addition, the reciprocal of St must be greater than a constant K to ensure jet formation. According to the results of this article, the values of K of double acting and single synthetic jet are 0.25 and 0.5 eventually.
Subjects
合成噴流
複動式合成噴流
數值模擬
衝擊冷卻
背光模組
發光二極體
synthetic jet
double acting
simulation
LED
backlight module
impinging cooling
moving boundary
Type
thesis
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