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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7269完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳炳煇 | |
| dc.contributor.author | Chia-Chi Liu | en |
| dc.contributor.author | 劉家齊 | zh_TW |
| dc.date.accessioned | 2021-05-19T17:40:48Z | - |
| dc.date.available | 2021-08-07 | |
| dc.date.available | 2021-05-19T17:40:48Z | - |
| dc.date.copyright | 2019-08-07 | |
| dc.date.issued | 2019 | |
| dc.date.submitted | 2019-07-31 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7269 | - |
| dc.description.abstract | 本研究探討在密閉腔體下的冷凝熱傳現象。以外直徑25mm的紅銅館為熱傳導物質，利用較為簡單的印製方式在紅銅柱表面印上奈米碳管墨，以不同印製面積比當作變因，也就是比較純紅銅、全冷凝表面印製、30%、50%、70%，進行實驗觀測該印製的奈米碳管對於冷凝現象的影像。
經量測顯示奈米碳管印製面積的接觸角為76∘，而未改質表面之接觸角為107∘，然而實驗結果觀測到，在低過冷度段，也就是0~7.5∘，印製面積30%和50%均有呈現熱傳增強的現象，經影像觀測發現在此過冷度區間不分親水性面積有助於冷凝液的移動和成核。而過冷度大於7.5∘，也就是近濕潤轉變後，印製面積30%、50%、70%的熱傳效果有降低的趨勢。由此研究可得知，此方法印製的奈米碳管表面會呈現親水性，但部分印製的冷凝表面再低過冷度區間有熱傳增強的效果。 | zh_TW |
| dc.description.abstract | This research focused on condensation heat transfer of copper cylinder inside a closed chamber. The dimension of cylinder is 25mm in diameter and 50mm in length. Besides, the modification method is printing carbon nanotube (CNT) onto the copper surface with different printing area ratio: 0%, 30%, 50%, 70%, and 100% as one of controlling factors. The other one is the subcooling degree, which is the temperature difference between condensation wall and steam.
After measurement, the wettability of CNT printed area is hydrophilic, while the one of plain surface is hydrophobic. However, the experimental results showed that within lower interval of subcooling degrees, which is 0 to 7.5∘, the heat transfer coefficient and heat flux of the 30% and the 50% types are higher than the plain one. Accompanying the experimental images, hydrophilic surface has benefit to droplet movement and nucleation. On the other hands, the 30%, the 50%, and the 70% types worsen the heat transfer as the subcooling degree is >7.5∘ because the wetting transition induced the flooding upon the surface. From this research, even with hydrophilic patterns, the heat transfer performance could be enhanced during some subcooling degrees. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-19T17:40:48Z (GMT). No. of bitstreams: 1 ntu-108-R06522108-1.pdf: 4144124 bytes, checksum: 71f1a73b2e65bba262a2fe6e8f605bf5 (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | 論文口試委員審定書 II
致謝 III 中文摘要 IV Abstract V Nomenclature VI List of Figures X List of Tables XII Chapter 1. Introduction 1 1.1 Motivation 1 1.2 Literature Review 3 1.2.1 Condensation Heat Transfer Enhancement 3 1.2.2 Carbon Nanotube (CNT) 8 1.3 Purpose 9 Chapter 2. Theory 19 2.1 Surface Wettability 19 2.1.1 Wettability and Contact Angle Theory 19 2.1.2 Young’s Equation 20 2.1.3 Wenzel Model 21 2.1.4 Cassie-Baxter Model 22 2.1.5 Partial Wetting Model and Wetting Transition 22 2.2 Condensation Heat Transfer 27 2.2.1 Stages of Condensation 27 2.2.2 Effects from Non-condensable Gas (NCG) 32 Chapter 3. Experiments 35 3.1 Surface Modification 35 3.1.1 Chemical and Materials 35 3.1.2 Equipment 35 3.1.3 Procedures 36 3.2 Thermal System 42 3.2.1 Equipment 42 3.2.2 Setup and Procedures 43 3.3 Error Analysis 46 Chapter 4. Results and Discussion 56 4.1 The Condensation Effect of CNT Printing on the Copper 56 4.2 The Condensation Effect of Different Area Ratio 60 4.3 The Discussion in Enhancement of Heat Transfer in Partial Tsub 64 Chapter 5. Conclusion and Future Prospects 67 5.1 Conclusion 67 5.2 Future Prospects 68 Reference 70 | |
| dc.language.iso | zh-TW | |
| dc.subject | 冷凝熱傳 | zh_TW |
| dc.subject | 表面改質 | zh_TW |
| dc.subject | 濕潤性 | zh_TW |
| dc.subject | 奈米碳管 | zh_TW |
| dc.subject | 紅銅柱 | zh_TW |
| dc.subject | condensation heat transfer | en |
| dc.subject | carbon nanotube | en |
| dc.subject | surface modification | en |
| dc.subject | wettability | en |
| dc.subject | copper cylinder | en |
| dc.title | 奈米碳管印製於紅銅圓柱表面之冷凝熱傳研究 | zh_TW |
| dc.title | Experimental Investigation of Condensation Heat Transfer on a CNT Printed Copper Cylinder | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 107-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 許進吉,張天立 | |
| dc.subject.keyword | 冷凝熱傳,表面改質,濕潤性,奈米碳管,紅銅柱, | zh_TW |
| dc.subject.keyword | condensation heat transfer,surface modification,wettability,carbon nanotube,copper cylinder, | en |
| dc.relation.page | 80 | |
| dc.identifier.doi | 10.6342/NTU201902125 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2019-07-31 | |
| 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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