碩士 / 國立雲林科技大學 / 機械工程系碩士班 / 93 / An experimental study is conducted on forced convection heat transfer from heat sinks. A total of twelve heat sinks with six plate fin and six pin fin configurations are tested subjecting to confined cross flow, partially-confined cross flow and impingement flow conditions. The purpose of the present study can be divided into three parts: observation of the effect of the frontal velocity on the thermal resistance, investigation of the differences between confined cross flow and partially-confined cross flow, and examination of the performances under confined cross flow and impingement flow. Generally, the thermal resistance of the heat sinks decreases with increasing the frontal velocity and the total convective area. For a frontal velocity (Vfr) of 5m/s, the heat transfer coefficients of the staggered pin fins are 33% higher than those of the in-line pin fins and 50% higher than those of the plate pins, accompanying an increase of the pressure drops by 45% and by 50%, respectively. In addition, both the heat transfer coefficients and the pressure drops under confined cross flow are larger than those under partially-confined cross flow. For a frontal velocity of 5m/s, an enhancement of 15% for the heat transfer coefficients and 35% for the pressure drops are observed. For the comparison between the confined cross flow and the impingement flow, the heat transfer coefficients under impingement flow outperform those under confined cross flow by about 45% at the expense of tremendous pressure drops by 7 ~ 10 times.
| Identifer | oai:union.ndltd.org:TW/093YUNT5489017 |
| Date | January 2005 |
| Creators | Zhi-You Lin, 林芝佑 |
| Contributors | Ing-Youn Chen, 陳英洋 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 116 |
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