生成陽極氧化鋁奈米管對提升散熱鰭片熱傳性能之研究

Study on the enhanced heat transfer performance of fin heat sinks with grown anodic aluminum oxide nanotubes

賴冠中(Kuan-Chung Lai)

指導教授 ： 翁輝竹

中原大學/工學院/機械工程研究所/碩士(2016年)

https://doi.org/10.6840/cycu201600351

摘要

本研究分析具氧化鋁奈米管散熱鰭片之熱傳性能。主要目的在實驗探討不同對流條件下，生成氧化鋁奈米管對平板散熱鰭片與柱狀散熱鰭片熱通量及熱阻之影響。首先，運用陽極氧化法於鋁製平板散熱鰭片與柱狀散熱鰭片上以生成陽極氧化鋁奈米管。接著，控制不同陽極氧化處理時間與電壓，以獲得不同奈米管長與管徑之奈米管。進一步，利用掃描電子顯微鏡觀察奈米管生長結果。最後，將具奈米管之散熱鰭片放置於一散熱測試系統，以計算其熱通量與熱阻。
研究結果顯示，在自然對流與混和對流情形下，增加陽極氧化處理時間可生成較長管長之奈米管，其散熱鰭片之熱通量及熱阻隨著管長增長而分別上升及下降，然後趨於平緩；增加陽極氧化處理電壓可生成較大管徑之奈米管，則隨著管徑增大而分別有極大與極小值。在自然對流下平板散熱鰭片有較好的熱傳性能，在混和對流下柱狀散熱鰭片則有較好的熱傳性能。此外，研究結果亦發現，具奈米管之散熱鰭片熱傳性能較不具奈米管之散熱鰭片好。因此，可證明若將陽極氧化處理應用於散熱鰭片使之生成奈米管，可明顯提升散熱鰭片之熱傳性能。

關鍵字

散熱鰭片 ； 氧化鋁奈米管 ； 陽極氧化處理 ； 電子冷卻

並列摘要

This paper conducts a study on the heat transfer performances of fin heat sinks with aluminum oxide nanotubes. The main purpose is to experimentally investigate the influence of growing aluminum oxide nanotubes on the heat flux and thermal resistance for plate-fin and pin-fin heat sinks under different convective conditions. First, aluminum oxide nanotubes are grown on aluminum plate-fin heat sinks by using the anodic oxidation method. Then, nanotubes of different lengths and diameters are obtained by controlling the anodic oxidation time and voltage. Further, the results generated nanotubes are observed by using the scanning electron microscope. Finally, the heat sinks with nanotubes are put in a thermal test system so as to determine the heat flux and thermal resistance.
Results reveal that, both for natural convection and mixed convection cases, as the nanotube length increases due to the increase of anodic oxidation treatment time, the heat flux and thermal resistance of a fin heat sink increases and decreases, respectively, and then approaches a constant; as the nanotube diameter increases due to the increase of treatment voltage, the heat flux and thermal resistance has the maximum and minimum value, respectively. For natural convection case, a plate-fin heat sink has a better heat transfer performance than a pin-fin heat sink. As for mixed convection case, a pin-fin heat sink get a better heat transfer performance. It is also found that, a heat sink with aluminum oxide nanotubes has a better heat transfer performance than the one without nanotubes. Therefore, the study is demonstrated that the anodic aluminum oxidation treatment which is applied to fin heat sinks could be a great benefit to the enhanced heat transfer performance.

並列關鍵字

fin heat sinks ； aluminum oxide nanotubes ； anodic oxidation treatment ； electronic cooling

參考文獻

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