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| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 陳炳煇 | zh_TW |
| dc.contributor.advisor | Ping-Hei Chen | en |
| dc.contributor.author | 吳嘉輝 | zh_TW |
| dc.contributor.author | Chia-Hui Wu | en |
| dc.date.accessioned | 2024-08-29T16:17:23Z | - |
| dc.date.available | 2024-08-30 | - |
| dc.date.copyright | 2024-08-29 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-12 | - |
| dc.identifier.citation | [1] S. Nukiyama, "The maximum and minimum values of the heat Q transmitted from metal to boiling water under atmospheric pressure," International Journal of Heat and Mass Transfer, vol. 9, no. 12, pp. 1419-1433, 1966.
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Y. Ho, and K. K. Wong, "A critical review of pool and flow boiling heat transfer of dielectric fluids on enhanced surfaces," Applied Thermal Engineering, vol. 112, pp. 999-1019, 2017. [24] E. Von Hippel, S. Thomke, and M. Sonnack, "Creating breakthroughs at 3M. Harvard Business Review," ed: September-October, 1999. [25] A. Brand, "Knowledge management and innovation at 3M," Journal of knowledge management, vol. 2, no. 1, pp. 17-22, 1998. [26] J. R. Taylor and W. Thompson, An introduction to error analysis: the study of uncertainties in physical measurements. Springer, 1982. [27] S. G. Kandlikar, "A theoretical model to predict pool boiling CHF incorporating effects of contact angle and orientation," Journal of Heat Transfer-Transactions of the Asme, vol. 123, no. 6, pp. 1071-1079, Dec 2001, doi: 10.1115/1.1409265. [28] S. J. Thiagarajan, R. Yang, C. King, and S. Narumanchi, "Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces," International Journal of Heat and Mass Transfer, vol. 89, pp. 1297-1315, 2015. [29] S. Ming-Heng, J. Ma, and W. Bu-Xuan, "Analysis on hysteresis in nucleate pool boiling heat transfer," International journal of heat and mass transfer, vol. 36, no. 18, pp. 4461-4466, 1993. [30] C. Li and G. Peterson, "Parametric study of pool boiling on horizontal highly conductive microporous coated surfaces," 2007. [31] C. M. Patil and S. G. Kandlikar, "Pool boiling enhancement through microporous coatings selectively electrodeposited on fin tops of open microchannels," International Journal of Heat and Mass Transfer, vol. 79, pp. 816-828, 2014. [32] J. Kim, S. Jun, J. Lee, J. Godinez, and S. M. You, "Effect of surface roughness on pool boiling heat transfer of water on a superhydrophilic aluminum surface," Journal of Heat Transfer, vol. 139, no. 10, p. 101501, 2017. | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/95143 | - |
| dc.description.abstract | 本研究探討了飛秒雷射燒蝕的微米柱狀結構和電鍍多孔層一起施加在平坦銅表面上，對Novec-7100池沸騰熱傳的綜合效果。在微米柱狀結構的製造過程中使用了飛秒雷射，並在雷射燒蝕測試表面之後，對測試表面再進行了二步電鍍製程以進一步增強表面。在二步電鍍製程中，第一階段較大的電流密度產生的氫氣泡可以在測試表面上製造微小空腔。由於這兩種表面改質方法的支持，當柱狀結構的間距（溝槽寬度）為300μm且第一階段電流密度為500 mA/cm2時，獲得了最高的HTC（比光滑平坦表面增加206%）和CHF（比光滑平坦表面增加24.85%）的改進。HTC的增加可以歸因於再濕潤能力的增強、表面粗糙度、空腔數量和空腔尺寸的增加，並通過雷射共軛焦顯微鏡分析、掃描電子顯微鏡圖像和氣泡高速攝影圖像得到了解釋。此外，在第一階段電流密度較高的情況下，CHF值由於毛細能力的改善而增加；而在較低的第一階段電流密度的情況下，由於電鍍產生的孔徑不夠大，甚至可能減少氣泡浮力相較於孔徑黏附力的大小，導致氣泡停滯在表面上不離開，因而導致CHF值與光滑平坦表面相比減少。 | zh_TW |
| dc.description.abstract | This study investigated the combined effects of laser-textured micro-pin-fin and electrodeposited porous layer over a flat copper surface on pool boiling heat transfer of Novec-7100. The femtosecond laser was applied during the fabrication process of micro-pin-fin. After the laser texturing, a two-step electrodeposition process was employed on the test surface for further surface enhancement. The ability of the larger first-stage current density to generate hydrogen bubbles can create cavities on the boiling surface. Supported by these two surface-enhancing effects, the greatest improvement of HTC (206% increment compared with plain surface sample) and CHF (24.85% increment compared with plain surface sample) was achieved using a modified surface with a pin spacing (groove width) of 300 μm and a first-stage current density of 500 mA/cm2. The HTC increment can be attributed to the increased ability of circulation of the rewetting liquid, surface roughness, number of cavities, and cavity size, and elucidated by the analysis of laser confocal microscope, SEM images and high-speed images of bubbles. Furthermore, compared with the plain surface sample, the CHF values increased due to the improvement of the capillary wicking ability in the region of higher first-stage current density, and decreased due to the smaller pore size that could deteriorate the buoyancy of the bubbles compared with the adhesion force in the cavities, causing the bubbles to stagnate on the surface, in the region of lower first-stage current density. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-08-29T16:17:23Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-08-29T16:17:23Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員審定書 i
摘要 ii Abstract iii Nomenclature iv Table of Contents vii List of Figures ix List of Tables xii Chapter 1 Introduction 1 1.1 Literature review 1 1.1.1 Pool boiling 1 1.1.2 Surface modification 3 1.1.3 Effect of surface roughness on pool boiling 4 1.1.4 Effect of porous surfaces on pool boiling 7 1.1.5 Effect of microchanneled surfaces on pool boiling 10 1.1.6 Effect of electrodeposited surfaces on pool boiling 14 1.2 Research objectives 16 Chapter 2 Theory 17 2.1 Evaporation and boiling phenomenon 17 2.2 Surface energy 17 2.3 Rohsenow’s correlation 18 Chapter 3 Experimental approach 20 3.1 Experimental setup 20 3.2 Fabrication process of test samples 24 3.3 Surface morphology 28 3.4 Properties of working fluid 32 3.5 Experimental procedure 33 3.6 XRD impurities detection 34 3.7 Data reduction 35 3.8 Uncertainty analysis 36 Chapter 4 Results and discussion 37 4.1 Validation of the experimental setup 37 4.2 Evaluations of pool boiling heat transfer data 39 4.2.1 Boiling hysteresis 42 4.2.2 Analysis of HTC curves 43 4.2.3 Effect of groove width 45 4.2.4 Effect of current density 48 4.3 Analysis of bubble dynamics 51 Chapter 5 Conclusions and Future Prospects 53 5.1 Conclusions 53 5.2 Future prospects 54 References 56 | - |
| dc.language.iso | en | - |
| dc.subject | 池沸騰 | zh_TW |
| dc.subject | 臨界熱通量 | zh_TW |
| dc.subject | 熱傳係數 | zh_TW |
| dc.subject | 介電液 | zh_TW |
| dc.subject | 電鍍 | zh_TW |
| dc.subject | 飛秒雷射 | zh_TW |
| dc.subject | Femtosecond laser | en |
| dc.subject | Dielectric liquid | en |
| dc.subject | Pool boiling | en |
| dc.subject | Electrodeposition | en |
| dc.subject | Critical heat flux | en |
| dc.subject | Heat transfer coefficient | en |
| dc.title | 探討具有雷射燒蝕的微米柱狀結構和電鍍多孔結構之銅表面對Novec-7100池沸騰的綜合影響 | zh_TW |
| dc.title | Combined effects of laser-induced micro-pin-fin and electrodeposited porous structure over a copper surface on pool boiling of Novec-7100 | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 李達生;張天立 | zh_TW |
| dc.contributor.oralexamcommittee | Da-sheng Lee;Tien-Li Chang | en |
| dc.subject.keyword | 池沸騰,飛秒雷射,電鍍,介電液,熱傳係數,臨界熱通量, | zh_TW |
| dc.subject.keyword | Pool boiling,Femtosecond laser,Electrodeposition,Dielectric liquid,Heat transfer coefficient,Critical heat flux, | en |
| dc.relation.page | 58 | - |
| dc.identifier.doi | 10.6342/NTU202403511 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2024-08-13 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 機械工程學系 | - |
| Appears in Collections: | 機械工程學系 | |
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| ntu-112-2.pdf Restricted Access | 6.97 MB | Adobe PDF |
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