Numerical Analysis of Natural Convection for Vertical Heat Sink in LED Backlight Modules
Date Issued
2007
Date
2007
Author(s)
Chen, Tai-Wei
DOI
zh-TW
Abstract
Along with the explosion of LED-related industry, applying LED containing low-voltage operation, high-color rendering, and low pollution to LCD TV backlight is going to be no longer a high-priced business. In the future, it is very possible to solve the heat dissipation problem in the jumbo-sized backlight models by the application of natural convection which is low-cost, no extra power supply, and no vibration phenomenon. Therefore, under the limitation of TV exterior shape and open area of shell, figuring out the optimizing design of the heat sink is the keystone of this article. Furthermore, according to the result of simulation, the temperature distribution, heat transfer efficiency, and optimized design of heat sink within the definite convection space are apparently different from those in free space, and the results in shrouded space is even hard to be estimated by those in all free space. Under the influence of opening ratio of the shell, the convection temperature of fluid in the system increase as the ratio decrease, especially obviously below 50% of the open area. In addition, at the end of the article Nusselt Number－Rayleigh Number relation curve is used to analyze the convection effect under different conditions. The result shows that only by changing the two parameters, shrouded clearance and opening ratio, the Nusselt Number－Rayleigh Number correspondent relationship can be obviously affected. Other parameter, like adjusting the fin pitch, can directly change the surface temperature of heat sink, but it has nothing to do with Nusselt Number－Rayleigh Number correspondent relationship.
Subjects
自然對流
散熱鰭片
開孔率
壓降係數
數值模擬
Natural Convection
Shrouded Heat Sink
Opening Ratio
Pressure Drop Coefficient
LED Backlight Modules
Type
thesis
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