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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/35441

    Title: Investigation of silver nano-fluid heat pipe thermal performance
    Other Titles: 銀奈米流體於熱管之性能研究
    Authors: 魏維瑲;Wei, Wei-chiang
    Contributors: 淡江大學機械與機電工程學系博士班
    康尚文;Kang, Shung-wen
    Keywords: 奈米流體;熱管;熱阻;Nano-fluid;Heat Pipe;Thermal resistance
    Date: 2008
    Issue Date: 2010-01-11 06:33:06 (UTC+8)
    Abstract: 本論文主要為研究銀奈米流體於溝槽式熱管與燒結式熱管之性能影響。實驗中之銀奈米顆粒之粒徑為10奈米與35奈米。在實驗過程以量測奈米流體與純水充填於熱管之溫差,進而計算其熱阻來比較其性能差異。溝槽式熱管於30~60W輸入功率下,當工作流體為銀奈米流體時其熱阻較純水充填熱管之降低範圍在10%~80%。另外,實驗結果顯示溝槽式熱管之熱阻,隨著銀奈米流體濃度與銀奈米顆粒之上升,而有較低之熱阻。在燒結式熱管於輸入功率為30~50W時,銀奈米流體熱管之溫差,相較於純水熱管小了0.56℃~0.65℃。此外,銀奈米流體充填於燒結式熱管中,可達70W之操作功率,相較於工作流體為純水時高了20W之操作功率
    The purpose of this thesis is to study the effects of silver nano-fluids on grooved heat pipe and sintered heat pipe thermal performance. The nano-fluid used in this study is an aqueous solution of 10 nm and 35nm diameter silver nanoparticles. The experiment was performed to measure the temperature distribution and compare the heat pipe thermal resistance using nano-fluid and DI-water. The experimental result of grooved heat pipe showed that thermal resistance decreased 10%~80% compared to DI-water at an input power of 30~60W. And the measured results also show that the thermal resistances of the heat pipe decrease as the silver nanoparticle size and concentration increase. The experimental result of sintered heat pipe, the nano-fluids filled heat pipe temperature distribution demonstrated that the temperature difference decreased 0.56~0.65℃ compared to DI-water at an input power of 30~50W. And the nano-fluid as working medium in heat pipe can up to 70W and is higher than pure water about 20W.

    In addition, the characteristics of silver nano-fluid concentrations and sizes on copper plate surface wettability were investigated. The experimental results presented that the surface wettability changed with the nano-fluid concentrations and particle sizes. The most significant finding was that the nanoparticle composition percentage, nano-porous layer distribution and particle concentration were influenced mainly by the contact angle.

    The fundamental mechanisms (effective thermal conductivity, surface wettability and convective heat transfer) of enhanced heat transfer for heat pipes have taken the first step to investigate. The results showed that surface wettability enhancement can be mainly mechanism in improved the heat pipe thermal performance. Due to a significant increase in wettability, thus leading to the capillary force, critical heat flux and condensation enhancement.
    Appears in Collections:[機械與機電工程學系暨研究所] 學位論文

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