碩士 / 國立臺北科技大學 / 能源與冷凍空調工程系碩士班 / 101 / This study investigate a micro-channel heat sink integrated with micro jets. The cooling fluid was introduced to a 12×12 mm2 heated surface, which had 11 micro-channels, each channel was 0.8 mm high, 0.6 mm wide, and 12 mm in length. Micro-fin of 0.3mm height, 0.2mm width, and 12mm in length is made on the bottom of each channel.The volume of micro-channels reduces approximately 12.5% by the micro-fins.
In the tests, the working fluid is FC-72, the saturation temperature of cooling device system was set at 30 and 50℃, and the volume flow rate varied from 100 to 710 ml/min. The experimental results showed that heat transfer performance increased with increasing flow rate for single phase heat transfer.
The micro fins enhances the heat transfer in two phase boiling heat transfer. However, for the flow rate greater than a certain value, the increase of pressure drop hinders the bubble formation, and results in heat transfer performance degradation. In this study, at the saturation temperature of 30 ℃, and the flow rate of 450mL/min , the heat sink yields the maximum heat flux of 210 W/cm2, and the lowest thermal resistance of 0.1313K / W. Single phase and two phase heat transfer empirical correlations have been developed for the present heat sink, and the prediction error for most data are within ± 20% and± 30%, respectively.
| Identifer | oai:union.ndltd.org:TW/101TIT05703058 |
| Date | January 2013 |
| Creators | Cheng-Yu cgen, 陳正裕 |
| Contributors | 簡良翰 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 120 |
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