熱室壓鑄蜂巢式散熱結構強制對流熱傳之研究

Study of Forced Convection Heat Transfer of Honeycomb Heat Sink by Hot Chamber Die-Casting

劉信傑(Hsin-Chieh Liu)

指導教授 ： 周榮源

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2010年)

https://doi.org/10.6827/NFU.2010.00079

摘要

本論文中設計一應用於強制對流之可排列組合蜂巢式散熱結構，所使用之材料為鋅合金，並利用熱室壓鑄製程製造生產。本文將針對蜂巢式散熱結構在不同操作條件與組合安排下之熱阻值 R，以實驗方法來探討其在不同排列組合(串聯、並聯)、不同風速 1 ~ 5 m/s以及熱源大小不同20W、40W等條件下之強制對流熱傳效果。
由研究結果顯示，在串聯2塊散熱結構，且熱源功率為20W與40W時，熱阻大小僅相差約0.03%，顯示加熱功率對此散熱結構之熱阻值影響非常有限。串聯時，由於散熱面積增加，對熱傳性能提升很有幫助，但改善的效果有限，散熱結構1塊變串聯2塊降低熱阻值30%；串聯2塊變串聯3塊降低熱阻值剩15%；當散熱結構為2塊時，在雷諾數1935.67時，改變排列方式(串聯變並聯)比增加到串聯3塊散熱結構，降低較多的熱阻值，相差4.3%，但當雷諾數提高後，串聯3塊的改善的熱傳性能則反而超越改變排列方式。由本研究得知，所設計之蜂巢式散熱結構的散熱性能，除了散熱面積和風速的影響之外，壓降是另一個非常重要的因素。因此，未來若要將此散熱結構應用於強制對流設計時，必須先針對散熱結構幾何形狀、風速及壓降進行最佳化設計，如此才能充分發揮蜂巢式散熱結構的散熱特性。

關鍵字

散熱結構 ； 強制對流 ； 實驗量測 ； 壓鑄

並列摘要

This study designs a honeycomb heat sink of forced convection, which can be tandem arrangement and Parallel arrangement. And it make by hot chamber die-casting manufacturing process. The use of experimental methods to study the honeycomb heat sink of forced convection heat transfer effects in different operating conditions: wind speed 1 ~ 5 m/s and heat source 20W, 40W, and combination arrangement: tandem arrangement and Parallel arrangement, which of the thermal resistance R.
In the results, in tandem 2 honeycomb heat sinks, used heat source by 20W and 40W, the thermal resistance was within 0.03% of the gap. It shows the heating power effect thermal resistance of honeycomb heat sink is very limited. In Series, increased the total surface area was helpful of heat transfer performance, but had limited. 1 honeycomb heat sink change to 2 honeycomb heat sinks, which thermal resistance decreased by 30%. 2 honeycomb heat sinks change to 3 honeycomb heat sinks, which thermal resistance decreased by 15%.When there had 2 honeycomb heat sinks, Reynolds number in 1935.67, the change in arrangement to reduce the thermal resistance more than increase one honeycomb heat sink in Series, a difference of 4.3%. After improve the Reynolds number, which increases one honeycomb heat sink beyond the change in arrangement. From the results that, the heat transfer performance of honeycomb heat sinks, in addition to the cooling area and the wind speed, another very important factor is the pressure drop. Therefore, if in the future will apply this cooling structure in the forced convection design, must do optimal design on the geometry, wind speed and pressure drop. Then it can give full play honeycomb heat sink of heat transfer characteristics.

並列關鍵字

heat sinks ； Forced Convection ； experimental measurement ； die-casting

參考文獻

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