碩士 / 國立聯合大學 / 機械工程學系碩士班 / 102 / Due to the rapid development of science and technology, high performance electronics get lighter, thinner, shorter and smaller. Heat generation per unit volume is thus dramatically increasing and hot spots will be occurred. Since hot spots will reduce the performance of electronics and even let electronics burned, how to dissipate heat becomes a critical issue. Currently, a combination of vapor chamber and heat sink is the most promising solution. Phase change of working fluid in the vapor chamber makes heat transport rapidly and diminishes the hot spot issue. Then, heat will be dissipated to the air via heat sink. In order to create a better heat dissipation device, a vapor chamber and a heat sink are merged into a novel device, called Extended Vapor Chamber. A commercial software, SolidWorks Flow Simulation 2010, is employed to analysis the heat transfer behavior in the new device, and then to find out the optimal thermal design.
Thermal performances of Extended Vapor Chamber with various effective thermal conductivities as well as the solid copper heat sink are compared in this study. The results show that thermal performances will increase with increasing diameter of fins, height of fins, and pitch between fins. Moreover, the thermal performance of Extended Vapor Chamber is always better than that of the solid copper heat sink no matter what heat generation is applied. When Extended Vapor Chamber runs with fans, the thermal performance of inlet system is better than that of outlet system.
Furthermore, the effects of diameter of fins and pitch between fins on the thermal performance are also investigated. The results show that the thermal resistance is approaching to the lowest value of 1.65oC/W as the diameter of fins is greater than 14 mm. And the thermal resistance is approaching to the lowest value of 2.51oC/W as the pitch between fins is greater than 10 mm if the diameter and the height of fins are 8 mm and 50 mm, respectively.
| Identifer | oai:union.ndltd.org:TW/102NUUM0489003 |
| Date | January 2014 |
| Creators | Jhih-Syong Siao, 蕭志雄 |
| Contributors | Sen-Puu Lin, 林森溥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 143 |
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