博士 / 國立成功大學 / 工程科學系碩博士班 / 92 / The study has two parts. The first part is on the effects of the pin-fin geometries on the thermal performance of fins by ANSYS finite element software simulation. The simulated results indicate that when the with the pin-fin configuration of 6x6, the fin has better thermal performance. Furthermore, when the height of the heat sink is above 10mm, no better thermal performance can be obtained. When the height of the pin-fin is fixed at 15mm, the thermal performance can not be improved by the variation of the base thickness of the heat sink. The second part concentrates on the effects of the pin-fin geometries on the fin’s ability to absorb or radiate electromagnetic waves by finite difference time domain (FDTD) numerical method. When the excitation source is external to the simulated electronic device, the electromagnetic wave exhibits resonance phenomena for the 2x2 and 3x3 pin-fin configuration. The energy of the resonance increases first as the excitation increases. But, at 10GHz excitation frequency, the resonance energy decreases by spreading to more resonance points. The resonance phenomena always occur despite of the location of the excitation source, either inside or outside the electronic device. The spreading of energy to more resonant frequencies is also observed when the excitation source is situated inside the electronic device even though the level is less significant.
| Identifer | oai:union.ndltd.org:TW/092NCKU5028067 |
| Date | January 2004 |
| Creators | Chih-Hsiung Ting, 丁志雄 |
| Contributors | Jung-Hua Chou, 周榮華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 121 |
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