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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳瑤明 | |
dc.contributor.author | Yuan-Hao Cheng | en |
dc.contributor.author | 鄭元豪 | zh_TW |
dc.date.accessioned | 2021-06-08T05:58:23Z | - |
dc.date.copyright | 2011-08-09 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-08-08 | |
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Cohen,* , and Michael F.Rubner,” Transparent Superhydrophobic Films Based on Silica Nanoparticles,” Langmuir, Vol. 23,pp7293-7298,2007. [27] Fevzi Cu . Cebeci, Zhizhong Wu, Lei Zhai, Robert E. Cohen, and Michael F. Rubner,” Nanoporosity-Driven Superhydrophilicity: A Means to Create Multifunctional Antifogging Coatings,” Langmuir, Vol 22, pp2856-2862,2006. [28] Minglin Ma, Randal M. Hill” Superhydrophobic surfaces” Int. J. Current Opinion in Colloid and Interface Science, Vol 11, pp193-202,2006. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24919 | - |
dc.description.abstract | 相變化熱傳應用於微流道具高均溫性、低工質量、高熱傳係數等優點,為未來高發熱問題最佳解決方案。近年來,表面改質應用於沸騰熱傳已獲得良好的應用。相關研究中指出,疏水表面相較於未改質表面可提供較多成核址,熱傳性能有所提升。因此本研究之目的為利用疊層組裝之技術,在一英吋之銅表面進行改質,探討疏水表面在流動沸騰中對微流道熱傳性能的影響,並與未改質表面進行比較。
本實驗以水為工作流體,在流量 172 kg/m^2-s,飽和壓力 101kpa 下進行熱傳實驗。結果可分為接觸角量測與熱傳實驗兩部分。在接觸角量測部分,固定製程條件下,靜態接觸角由 78°增加至 113°。在熱傳實驗部分,首先先將未改質微流道沸騰熱傳數據代入 Mudawar 在 2005 年提出的微流道熱傳與壓降經驗式,平均誤差約為 7.8%與 26%。未改質微流道在乾度小於 0.14 前,熱傳係數不隨乾度而改變,而疏水表面之熱傳係數在起始沸騰時達峰值,遞減後隨乾度增加而保持定值,相較於未改質的微流道,整體熱傳性能有 100%的提升,顯示疏水表面的微流道蒸發器在散熱應用上極具潛力。 | zh_TW |
dc.description.abstract | Phase-change heat transfer in microchannels provides good temperature uniformity, less coolant flow rates requirement and high cooling efficiency. Previous studies indicates hydrpophobic surface proposed more nucleation sites after onset of nucleation boiling, which enhancing boiling heat transfer. In present study, we demonstrate a layer-by-layer processing scheme that can create hydrophobic surface from silicon dioxide nanoparticles on 1 square inch copper substrate. The purpose of this research is to investigate flow boiling heat transfer behavior of hydrophobic and uncoated surface on microchannels.
Experiments are conducted with water, under mass fluxes of 172 kg/m2-s, saturated pressure of 101kpa. After layer-by-layer processing, the static contact angle from 78° to 113°. The experimental data of uncoated surface was substituted into Mudawar’s heat transfer and pressure drop microchannels correlation, the mean average was 7.8% and 26%. The heat transfer coeficient of uncoated surface keeps constant when quality before 0.14, but the heat transfer coefficient of hydrophobic surface reached peak value at onset nucleation boiling, then decrease to constant. The experimental results showed that microchannels with hydrophobic surface enhanced 100% heat transfer coefficient than uncoated surface overall. To conclude this study, the hydrophobic surface on microchannels is highly potential for cooling applications. | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T05:58:23Z (GMT). No. of bitstreams: 1 ntu-100-R98522114-1.pdf: 1155550 bytes, checksum: e063a364d5b7d020dedef727da67bcab (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 口試委員審定書 i
誌謝 ii 摘要 iii Abstract iv 目錄 v 圖目錄 viii 表目錄 ix 符號說明 x 第一章 緒論 1 1.1前言 1 1.2文獻回顧 3 1.2.1微流道尺寸的界定 3 1.2.2微流道沸騰熱傳研究 6 1.2.3表面改質於沸騰熱傳研究 9 1.3研究目的 10 第二章 疏水表面於微流道之設計與製作 11 2.1 微流道尺寸參數選定 11 2.2 奈米粒子薄膜之設計與製造 13 2.2.1 靜電疊層組裝原理與參數選擇 13 2.2.2 疏水表面微流道之製造 14 第三章 實驗設備及方法 17 3.1 實驗迴路 17 3.2 實驗工質 20 3.3 測試段模組 21 3.4 實驗步驟 23 3.4.1 實驗預備工作 23 3.4.2 測試步驟 23 3.5.1 熱傳係數的計算 24 3.5.2 乾度的計算 26 3.6 誤差分析 26 3.6.1 熱通量之誤差 27 3.6.2 壁面過熱度之誤差 28 3.6.3 熱傳係數之誤差 29 第四章 結果與討論 30 4.1 未改質微流道蒸發器驗證 30 4.1.1 熱傳係數 30 4.1.2 壓降驗證 32 4.2 未改質與疏水表面 34 4.2.1 靜態接觸角量測 34 4.2.2 沸騰曲線 34 4.2.3 熱傳係數 35 第五章 結論與建議 37 5.1 結論 37 5.2 建議 38 參考文獻 39 附錄A 熱電偶校正曲線 43 附錄B 壓力感測器校正曲線 44 附錄C 流動沸騰實驗系統熱洩漏圖 45 附錄D 照片 46 | |
dc.language.iso | zh-TW | |
dc.title | 應用疊層組裝於微流道沸騰熱傳增強研究 | zh_TW |
dc.title | Heat Transfer Enhancement in Microchannels
with Layer By Layer Assembly Surface Modification | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 吳聖俊,劉君愷 | |
dc.subject.keyword | 微流道,沸騰熱傳增強,靜電疊層組裝,表面改質, | zh_TW |
dc.subject.keyword | microchannel,boiling heat transfer enhancement,Layer-by-layer assembly,surface modification, | en |
dc.relation.page | 51 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2011-08-08 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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