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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51731完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳炳煇(Ping-hei Chen) | |
| dc.contributor.author | Yu-Ying Chen | en |
| dc.contributor.author | 陳昱穎 | zh_TW |
| dc.date.accessioned | 2021-06-15T13:46:48Z | - |
| dc.date.available | 2023-08-31 | |
| dc.date.copyright | 2020-08-20 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-08-12 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51731 | - |
| dc.description.abstract | 本研究使用脈衝皮秒雷射於紅銅圓管上進行表面改質，構織出均質雷射表面及魚骨形雷射表面，與拋光純銅表面比較於池沸騰中之沸騰熱傳性能。在池沸騰實驗中，以去離子水當作工作流體且實驗主要進行於成核沸騰階段(本實驗最高熱通量約至426 kW/m2)。然而，熱通量、壁面過熱度和沸騰熱傳係數均為本實驗的重要參數。與均質雷射改質表面相較，拋光純銅表面具有較高的沸騰熱傳係數，均質雷射表面雖具有較高的表面粗糙度(拋光純銅的平均表面粗糙度為0.025μm，經由雷射改質後，表面粗糙度提升至0.191μm)，其超親水的表面特性卻主導了表面的氣泡動力。為了增進銅圓管的沸騰熱傳係數，雷射表面改質採魚骨圖形，其圖形靈感來自於魚骨，目的是為了減少雷射改質面積及增加雷射於圖形邊界所產生的結構，利用邊界產生較多氣泡的現象，將氣泡限制於圖形上，促使氣泡容易相互聚合且離開加熱表面，並藉由較密集的魚骨圖形進一步提升氣泡離開頻率，到達最高熱通量時，沸騰熱傳係數可達至1.12倍的提升相較於拋光純銅表面。在本實驗中，使用雷射共聚焦顯微鏡量測圓管試塊的表面粗糙度及形貌，另外使用高速攝影機記錄在池沸騰過程中每一個試塊表面的氣泡分布及大小，並透過高速影像分析圓管上下表面溫度差的數據趨勢。 | zh_TW |
| dc.description.abstract | In this study, the effect of laser-textured surfaces on pool boiling heat transfer had been investigated. With the ultra-fast picosecond laser surface modification method, patterns with periodic micro-structure could be easily fabricated on surfaces of horizontal copper tubes. These pool boiling experiments were carried out on the nucleate boiling regime (heat flux up to 426 kW/m2) by using deionized water as a working fluid. Furthermore, the heat flux, wall superheat and boiling heat transfer coefficient were mainly investigated. Compared to the homogeneous laser-textured surface, the polished copper surface had larger heat transfer coefficient. Although the laser-textured surface had higher surface roughness, the superhydrophilic characteristic still dominated the bubble dynamics on the surface. In order to improve boiling heat transfer coefficient, the fishbone patterns were selected to apply on surfaces because more laser-textured edges and less laser-textured area could be achieved. Compared to the polished copper surface, the boiling heat transfer coefficient of the laser-textured dense fishbone surface was enhanced up to a factor of 1.12 higher at the highest evaluated heat flux. In addition, the results and discussion were supported by shape analysis of laser confocal microscope. Simultaneously, analysis of the temperature difference along different cylindrical samples was conducted using bubble dynamics. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T13:46:48Z (GMT). No. of bitstreams: 1 U0001-0908202013100100.pdf: 6259809 bytes, checksum: 1ea6d48f0089bca9cd7606e51a0e3e7f (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 摘要 iii Abstract iv Nomenclature v Table of Contents viii List of Figures xi List of Tables xv Chapter 1 Introduction 1 1.1 Preface 1 1.2 Background 2 1.3 Literature review 3 1.3.1 Effect of surface roughness on pool boiling 3 1.3.2 Effect of surface wettability on pool boiling 6 1.3.3 Surface wettability of laser-textured modification 10 1.3.4 Effect of laser-textured surface on pool boiling 15 1.4 Research purposes 20 1.5 Thesis structure 21 Chapter 2 Theory 22 2.1 Surface energy 22 2.2 Static contact angle 22 2.3 Young’s equation 24 2.4 Wenzel’s model 24 2.5 Cassie-Baxter model 25 2.6 Required energy relationship between the contact angle and vapor bubble generation 26 2.7 Theoretical model of heterogeneous wettable surface 27 2.8 Pulsed laser 30 Chapter 3 Experimental Approach 32 3.1 Experimental setups 32 3.2 Experimental procedures 34 3.3 Surface modification 34 3.3.1 Preparation of copper tube 34 3.3.2 Preparation of laser-textured surfaces 35 3.3.3 The geometry of laser-textured surfaces on copper tube with fishbone patterns 37 3.4 Instruments of measuring surface characteristics 38 3.4.1 Surface roughness and morphology 38 3.4.2 Surface wettability 39 3.5 Data reduction 40 3.6 Uncertainty analysis 41 Chapter 4 Results and Discussion 42 4.1 Surface morphology of laser-textured surfaces 42 4.2 Surface wettability of laser-textured surfaces 44 4.3 Heat flux and heat transfer coefficient data 45 4.4 Bubble departure diameter 49 4.5 Bubble departure frequency 50 4.6 Bubble dynamics 52 4.7 Circumferential temperature distribution 55 Chapter 5 Conclusions and Future Prospects 58 5.1 Conclusions 58 5.2 Future prospects 60 5.3 List of Publication 61 Reference 62 Appendix 69 | |
| dc.language.iso | en | |
| dc.title | 皮秒雷射構織仿魚骨圖形於紅銅圓管表面對池沸騰熱傳之影響 | zh_TW |
| dc.title | Effect of Biomimetic Fishbone Patterns on Copper Tubes Textured with Picosecond Laser on Pool Boiling Heat Transfer | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張天立(Tien-Li Chang),徐金城(Jin-Cherng Shyu) | |
| dc.subject.keyword | 超短脈衝皮秒雷射,超親水,魚骨形雷射表面,表面粗糙度,沸騰熱傳係數,熱通量,壁面過熱度, | zh_TW |
| dc.subject.keyword | Ultra-fast picosecond laser,Superhydrophilic,Heat flux,Wall superheat,Boiling heat transfer coefficient,Surface roughness,Laser-textured fishbone surface, | en |
| dc.relation.page | 76 | |
| dc.identifier.doi | 10.6342/NTU202002706 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-08-12 | |
| 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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