研究生: |
詹耀程 Yao-Chen Chan |
---|---|
論文名稱: |
以蒸發部溫度動態行為分析微小熱管之最大熱傳量 Analysis for Maximum Heat Dissipate of Heat Pipe by Dynamic Temperature Behavior of the Evaporator |
指導教授: |
林唯耕
Wei-Keng Lin |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 97 |
中文關鍵詞: | 熱管 、最大熱傳量 、燒結 、溝槽 、動態溫度追蹤 |
外文關鍵詞: | Heat Pipe, Heat Dissipate, Sinter, Groove, Dynamic Tracing |
相關次數: | 點閱:4 下載:0 |
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本篇論文主要是針對電子構裝散熱中之熱管元件進行了熱傳性能測試◦ 傳統熱管最大熱傳量測試方法為固定絕熱部溫度,量測不同加熱功率下之蒸發部溫度,最大熱傳量為蒸發部溫度發生突增時之前一加熱功率◦本文提出了一種新且較快速的熱管性能量測方法―動態溫度追蹤法(Dynamic-Temperature-Tracing Method)◦此方法乃利用自行撰寫程式追蹤動態之蒸發部與絕熱部溫度變化且無需控制絕熱部溫度,最大熱傳量發生在蒸發與絕熱部溫差突增之時◦本文亦提出熱管性能模擬理論來預測不同蒸發、冷凝長度與操作溫度時之熱管最大熱傳量◦實驗結果顯示,比較動態溫度追蹤法及傳統標準法量測熱管最大熱傳量其平均誤差值均在15%之內,比較熱管性能模擬之理論預測值與實驗值之平均誤差值亦在15%之內,且動態溫度追蹤法之測試時間可由原先傳統標準法之3~4小時減少為1小時之內,因此本文所發展之動態溫度追蹤法(D.T.T.)配合熱管性能模擬程式能快速且準確的量測計算微型熱管最大熱傳量◦
In traditional heat pipe performance test, to keep an adiabatic temperature at a constant value, the evaporator wall temperature would be slowly increased when the thermal power was step input to the evaporator of the heat pipe. The maximum heat transfer rate (Qmax) was then defined that when the evaporator wall temperature rapidly increased at a certain amount of power input to the heat pipe. However, it is not easy to distinguish this sharp increased curve and sometimes result in the wrong Qmax data. In addition, it took too long for waiting the evaporator temperature approach to a steady state, thus this process could not use be for the fully check Qmax of the heat pipe.
In this paper, we propose a novel quick test method to predict the maximum heat dissipation of the heat pipes namely Dynamic-Temperature-Tracing (D.T.T). The concept of the D.T.T was when we tracing the evaporator and the adiabatic wall temperature, these two temperature curves should be the same trend before the dry-out phenomena was occurred. Theoretically, when the dry-out start to occur in the heat pipe, the adiabatic temperature profile was no longer kept the same temperature profile as that of the evaporator. Hence, the maximum heat dissipate ability of the heat pipe was then easy to obtained at this measuring adiabatic temperature. The data were also compared with those obtained from the traditional standard method at the same equivalent evaporator length, condenser length and adiabatic temperature. In this experiments, sinter powder and groove heat pipes with diameter 6mm、8mm and 200mm length were selected as the capillary wick structure. Comparing with traditional method results, the errors of maximum heat transfer rate are less than 15%. The results also shown D.T.T. method is much fast and reliable compare with the traditional test method.
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