碩士 / 國立臺北科技大學 / 能源與冷凍空調工程系碩士班 / 105 / In this study, flow boiling experiment is tested with di-electric fluid, FC-72, which flow through a 14 mm by 14 mm square heated area in a square channel having variable space. Cubic fins of 0.2 mm in both height and width were made on the copper plate with 0.2 mm fin gap. The internal space of the test section is either 1/4, 1/2, or 3/4 covered. The experimental results showed that the single phase convetion heat transfer performane increased the ratio of covered area as a result of increased flow velocity above the heated surface under a confined space of 1.0mm channel height. For two phase convection with boiling, the heat transfer coefficient increased with the cover-ratio at 500 and 800 ml/min. However,insignificant effect on cover-ratio was found at 200 ml/min because the dominat heat transfer mechanism is boiling. Observation of flow phenomena showed that the bubble size reduced as the flow velocity increased with increasing cover- ratio.
| Identifer | oai:union.ndltd.org:TW/105TIT05703010 |
| Date | January 2016 |
| Creators | Sin-Hong Deng, 鄧信宏 |
| Contributors | Liang-Han Chien, 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 | 76 |
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