Analysis of the Thermal and Fluid Flow Fields under Multiple-Nozzle Impingement Jet Cooling with Taguchi Method
| Autor: | Chen-Yun Lin, 林辰昀 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 In the era of technological progress increasingly, electronic components develop towards compact size and precision. As the power of the electronic product quickly raises, it accompanies with a large amount of heat generation. The high heat generation effect significantly shortens the life of electronic components. Therefore developing the cooling module has become an important topic. Among these studies, the impingement jet integrated with the heat sink with excellent thermal conductivity properties provides a large heat reduction effect for local rapid cooling. In this study, the thermal and flow field phenomena for a heat sink with constant heat input under multiple-nozzle impingement jet cooling are investigated with computational fluid dynamics software FLUENT combined with computer aided design software SolidWorks. Taguchi method is also utilized to analyze the effects of nozzle inlet velocity, number of nozzles, jet angle and distance from nozzle to the top heat sink. The results show that increase of the nozzle inlet velocity can effectively reduce the thermal resistance of heat sink. However with the increase in flow rate, decrease of the magnitude of the thermal resistance becomes slowly. Distance from the nozzle to the top of the heat sink too far or too close will diminish the cooling effect. According to the numerical simulations, a better choice is between 48~64mm. In terms of the jet angle, controlling the angle for jet flow towards the middle point between the center and the edge of the wafer is the best choice. Investigation of the nozzle number, four-nozzle type can effectively dissipate heat when the angle is near 90 degrees. The jet flows create circulations around the central area when the jet flows towards the center of heat sink. This phenomenon results in a higher thermal resistance. Overall, number of nozzles and jet-angle must be considered at the same time to obtain a better cooling effect. According to Taguchi method analyses, the optimal parameters are A1B2C3D4, and the effect of parameter is ranked as jet velocity>jet>angle>impingement distance>number of nozzle. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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