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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 | Chung-Kai Wang | en |
dc.contributor.author | 王仲愷 | zh_TW |
dc.date.accessioned | 2021-06-12T17:54:22Z | - |
dc.date.available | 2008-02-18 | |
dc.date.copyright | 2008-02-18 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-02-04 | |
dc.identifier.citation | Bang, I. C., Chang, S. H., 'Boiling Heat Transfer Performance and Phenomena
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M., 'A Model of Thermal Conductivity of Nanofluids with Interfacial Shells,' Materials Chemistry and Physics, 90(2-3), pp. 298-301, 2005. You, S. M., Kim, J. H., Kim, K. H., 'Effect of Nanoparticles on Critical Heat Flux of Water in Pool Boiling Heat Transfer,' Applied Physics Letters, 83(16), pp. 3374-3376, 2003. Zuber, N., 'Hydrodynamic Aspects of Boiling Heat Transfer,' AECU-4439, Physics and Mathematics, US Atomic Energy Commission., 1959. 雍翰林, 畢勝山, 史琳, 'R134a/TiO2納米粒子工質體系在冰箱中的應用,' 化工學報, 57, pp. 141-145, 2006. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27043 | - |
dc.description.abstract | 奈米流體為深具發展潛力之熱傳增強技術之ㄧ,而池沸騰亦是工業界重要應用模式。然而奈米流體於池沸騰熱傳增強之研究尚付闕如,且效能不彰。因此本文旨在探討使用不同於前人研究之新式奈米流體搭配,期能進一步提升奈米流體於池沸騰系統之熱傳增強性能。研究方法為使用二階段法將二氧化鈦(TiO2)奈米粒子分散於1,1,1,2-四氟乙烷冷媒(R-134a)中以製得奈米流體,並找出對流熱傳係數與熱傳導係數之關係,期望能初步探討奈米流體之沸騰熱傳增強性能。
研究結果顯示濃度0.005 (%vol.)粒徑20 ~ 25 (nm)之TiO2/R134a奈米流體其沸騰對流熱傳係數可達60 (kW/m2-K),與純質R134a相比提升150 %。相同濃度下粒徑<50 (nm)之CuO/R134a與Al2O3/R134a亦有100 %與50 %之提升。由於本研究所使用之奈米流體其濃度低粒徑小,短期再分散性與數據重複性尚佳。由於沸騰溫度低故熱傳表面沉積層形成有限,致使臨界熱通量維持不變。本研究透過調控奈米流體熱傳導預測式以及池沸騰關係式中的參數,可初步定性分析池沸騰對流熱傳係數增強之現象。 總結而言,本實驗使用金屬氧化物與R134a搭配之奈米流體,並獲知其池沸騰熱傳增強性較水基者有更高的提升,可初步推論奈米粒子與工質之搭配將影響熱傳增強性能,本研究之經驗公式有待更精確的實驗與理論驗證。 | zh_TW |
dc.description.abstract | Nanofluid is expected to be one of the most potential techniques for heat transfer enhancement. Hence, recently studies have been carried out on the heat transfer behavior of nanofluids in two-phase heat transfer regimes such as pool boiling. However, the amount and performance of proposed works are scant and insignificant. Therefore, the aim of this article attempts to explore whether a further enhancement could be achieved by altering the nanoparticle/base-fluid combination used in previous studies. This research, a two-step procedure was used to disperse titania (TiO2) nanoparticles into 1,1,1,2-tetrafluoroethane (R-134a) to prepare nanofluid. The preliminary qualitative analysis of the pool boiling heat transfer enhancement of nanofluid was conducted through nanofluid and pool boiling correlations in order to indicate the relationship between thermal conductivity and boiling heat transfer coefficient.
Results of this study showed the boiling heat transfer coefficient of R-134a was shown to be increased by up to 150 % for nanofluid consisting of R-134a containing approximately 0.005 %vol. TiO2 nanoparticles of mean diameter 20 ~ 25 nm. On the other hand, the critical heat flux maintained the same by little deposition of nanoparticles. The short-range re-dispersibility and repeatability of data were found to be acceptable. To conclude, the R134a-based nanofluids may be better than water-based in pool boiling heat transfer enhancement application. Further, our modified empirical correlations need to be proved by detail experiments and theories precisely. | en |
dc.description.provenance | Made available in DSpace on 2021-06-12T17:54:22Z (GMT). No. of bitstreams: 1 ntu-97-R92522307-1.pdf: 2631496 bytes, checksum: e35e55cf17ee7465910c33c6cd0927d7 (MD5) Previous issue date: 2008 | en |
dc.description.tableofcontents | 致謝 i
中文摘要 ii 英文摘要 iii 目錄 iv 圖目錄 vii 表目錄 ix 符號說明 x 第一章 緒論 1 1.1研究動機與背景 1 1.2文獻回顧 3 1.2.1奈米流體單相熱傳增強文獻回顧 3 1.2.2奈米流體池沸騰熱傳增強文獻回顧 4 1.3研究目的 9 第二章 實驗原理與理論分析 12 2.1池沸騰熱傳曲線圖 12 2.2核沸騰曲線之預測公式 15 2.3臨界熱通量 17 2.4奈米流體熱傳增強機制與主要公式 18 2.4.1熱傳導係數 18 2.4.2對流熱傳數..................................................................................21 第三章 奈米流體介紹與製備 22 3.1奈米流體的優點 22 3.2奈米流體有待研究的課題 23 3.3奈米流體的選擇 .26 3.3.1工質的選擇..................................................................................26 3.3.2奈米粒子的選擇..........................................................................27 3.3.3奈米流體的製備..........................................................................28 第四章 實驗設備與方法 29 4.1熱傳增強性能實驗系統 29 4.1.1加熱模組 29 4.1.2測試段 30 4.1.3溫控模組 30 4.1.4資料擷取模組 30 4.2實驗步驟與方法 33 4.2.1實驗步驟 33 4.2.2實驗方法 33 4.3實驗數據換算 34 4.3.1冷媒熱物理性質 34 4.3.2熱散失計算 34 4.3.3壁面溫度計算 34 4.3.4對流熱傳係數計算 35 4.4誤差分析 35 第五章 結果與討論 38 5.1奈米粒子之大小與晶相 38 5.2熱傳性能測試 39 5.2.1對流熱傳係數比較 39 5.2.2臨界熱通量比較 41 5.3奈米粒子之再分散性 43 5.4 TiO2/R134a奈米流體之熱傳性能測試 44 5.5 TiO2/R134a, CuO/R134a與Al2O3/R134a奈米流體之比較 ..46 5.6奈米流體熱傳增強機制探討.............................................................46 第六章 結論與建議 54 6.1結論 54 6.2建議 55 參考文獻 56 附錄 66 | |
dc.language.iso | zh-TW | |
dc.title | 奈米流體應用於池沸騰熱傳增強研究 | zh_TW |
dc.title | Enhanced Pool Boiling Heat Transfer by Nanofluids | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 劉君愷,吳聖俊 | |
dc.subject.keyword | 熱傳增強,池沸騰,奈米流體,二氧化鈦,四氟乙烷冷媒, | zh_TW |
dc.subject.keyword | Heat transfer enhancement,Pool boiling,Nanofluid,Titania,R-134a, | en |
dc.relation.page | 74 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2008-02-04 | |
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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