https://scholars.lib.ntu.edu.tw/handle/123456789/66271
標題: | 壓電式薄膜泵結合冷卻水套(散熱式微泵)應用於筆記型電腦散熱之研究 The Heat Dissipation System of OAPCP-micropump for a Laptop |
作者: | 高仲志 Gao, Jhong-jhih |
關鍵字: | 單邊擺動;PDMS;散熱式微泵;散熱鰭片;散熱系統;熱阻;micropump;heat resistance;piezoelectric;one side actuating;cold plate | 公開日期: | 2008 | 摘要: | 在本研究中,開發出結合冷卻水套與薄膜泵的單邊擺動壓電式散熱式微泵(OAPCP-micropump)來改善筆記型電腦的散熱與電子產品的可靠性問題,利用壓電片與PDMS薄膜驅動工作流體,並配合進出口的閥片控制工作流體的單一流向,散熱式微泵將運用在筆記型電腦散熱上。散熱式微泵採用銅材質利用CNC加工而成,腔體(chamber)尺寸為45(mm)*28(mm)*4(mm)並在散熱式微泵腔體內利用散熱鰭片(fin)增加散熱面積,研究結果顯示散熱鰭片的形式影響壓降與流動型態甚巨,在腔體內的流體因為壓電片與薄膜的震動使熱對流效果更強,當鰭片高度為1.25(mm)時有最好的散熱效能,散熱式微泵流量不因鰭片數量由6片增加至12片而有衰減,散熱式微泵的最大流量為4.1(ml/s),揚程9807(Pa)水柱高,將散熱式微泵貼附於電子元件的發熱源上,利用工作流體將熱帶走,本研究分別固定散熱式微泵流量與發熱功率,在開放系統中量測出散熱式微泵的熱阻值,一併與流量做比較,作為改良散熱鰭片的依據,當壓電片工作頻率在140(Hz),散熱式微泵在開放系統中其單一元件熱阻值約0.15(℃/W),在循環系統中熱阻值約0.31(℃/W),系統熱阻約0.97(℃/W),整體而言藉由新設計的散熱式微泵的高流量,可提供一穩定的可靠的散熱表現。 In this study a new one-side actuating piezoelectric micropump combined with a cold plate (OAPCP-micropump) in a liquid cooling system to solve heat dissipation problems and to improve electronic device reliability for a laptop. The OAPCP-micropump, which is composed of a PDMS diaphragm, a 45(mm)*28(mm)*4(mm) pump chamber with added fins, a rectangular piezoelectric device, and two check valves, can allow a thinner design and drive liquid in one direction. The results show that the shape of the fins has a strong effect on the pressure drops and flow profiles. The fluid in the pump chamber may impinge on the fins and increase the heat dissipation rate due to the oscillation by the actuator. When the fins are shorter than 1.25(mm), they have a negligible effect on the performance of the OAPCP-micropump. In addition, increasing the number of fins from 6 to 12 can enhance the heat dissipation rate but has no influence on the flow rate. The measured maximum flow rate of the OAPCP-micropump is 4.1(ml/s), and its maximum pump head reaches 9807(Pa). The OAPCP-micropump sets on the electrical device dissipating the heat by the water flow. In open system fixed the power input and the flow rate respectively, measures the thermal resistance and the flow rate of the OAPCP-micropump to improve the designation. The thermal resistances of OAPCP-micropump are 0.15(℃/W)、0.31(℃/W) in open system and circulation system , respectively, the system thermal resistance is 0.97(℃/W) while input frequency 140(Hz). In general, the new cooling system with an OAPCP-micropump design shows a stable performance on total thermal resistance due to the high flow rate. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/187296 |
顯示於: | 機械工程學系 |
檔案 | 描述 | 大小 | 格式 | |
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ntu-97-R95522310-1.pdf | 23.53 kB | Adobe PDF | 檢視/開啟 |
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