碩士 / 中原大學 / 機械工程研究所 / 104 / 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.
| Identifer | oai:union.ndltd.org:TW/104CYCU5489033 |
| Date | January 2016 |
| Creators | Kuan-Chung Lai, 賴冠中 |
| Contributors | Huei-Chu Weng, 翁輝竹 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 88 |
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