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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 呂明璋 | zh_TW |
dc.contributor.advisor | Ming-Chang Lu | en |
dc.contributor.author | 許庭瑜 | zh_TW |
dc.contributor.author | Ting-Yu Hsu | en |
dc.date.accessioned | 2023-10-03T17:00:24Z | - |
dc.date.available | 2023-11-09 | - |
dc.date.copyright | 2023-10-03 | - |
dc.date.issued | 2023 | - |
dc.date.submitted | 2023-08-11 | - |
dc.identifier.citation | [1] Worthington, A. M. (1877). XXVIII. On the forms assumed by drops of liquids falling vertically on a horizontal plate. Proceedings of the royal society of London, 25(171-178), 261-272.
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[7] Liao, D., He, M., & Qiu, H. (2019). High-performance icephobic droplet rebound surface with nanoscale doubly reentrant structure. International Journal of Heat and Mass Transfer, 133, 341-351. [8] Panão, M. R. O., & Moreira, A. L. N. (2005). Thermo-and fluid dynamics characterization of spray cooling with pulsed sprays. Experimental Thermal and Fluid Science, 30(2), 79-96. [9] Weisensee, P. B., Ma, J., Shin, Y. H., Tian, J., Chang, Y., King, W. P., & Miljkovic, N. (2017). Droplet impact on vibrating superhydrophobic surfaces. Physical Review Fluids, 2(10), 103601. [10] Ng, B. T., Hung, Y. M., & Tan, M. K. (2016). Acoustically-controlled Leidenfrost droplets. Journal of colloid and interface science, 465, 26-32. [11] Shahriari, A., Wurz, J., & Bahadur, V. (2014). Heat transfer enhancement accompanying Leidenfrost state suppression at ultrahigh temperatures. Langmuir, 30(40), 12074-12081. [12] Shahriari, A., Ozkan, O., & Bahadur, V. (2017). Electrostatic suppression of the Leidenfrost state on liquid substrates. Langmuir, 33(46), 13207-13213. [13] Ozkan, O., & Bahadur, V. (2019). Electrical impedance-based characterization of electrostatic suppression of the Leidenfrost state. Applied Physics Letters, 114(15). [14] Celestini, F., & Kirstetter, G. (2012). Effect of an electric field on a Leidenfrost droplet. Soft Matter, 8(22), 5992-5995. [15] Feng, R., Zhao, W., Wu, X., & Xue, Q. (2012). Ratchet composite thin film for low-temperature self-propelled Leidenfrost droplet. Journal of colloid and interface science, 367(1), 450-454. [16] Kwon, H. M., Bird, J. C., & Varanasi, K. K. (2013). Increasing Leidenfrost point using micro-nano hierarchical surface structures. Applied Physics Letters, 103(20), 201601. [17] Jiang, M., Wang, Y., Liu, F., Du, H., Li, Y., Zhang, H., ... & Wang, Z. (2022). Inhibiting the Leidenfrost effect above 1,000° C for sustained thermal cooling. Nature, 601(7894), 568-572. [18] Agapov, R. L., Boreyko, J. B., Briggs, D. P., Srijanto, B. R., Retterer, S. T., Collier, C. P., & Lavrik, N. V. (2014). Asymmetric wettability of nanostructures directs Leidenfrost droplets. Acs Nano, 8(1), 860-867. [19] Liu, M., Li, J., Zhou, X., Li, J., Feng, S., Cheng, Y., ... & Wang, Z. (2020). Inhibiting Random Droplet Motion on Hot Surfaces by Engineering Symmetry‐Breaking Janus‐Mushroom Structure. Advanced Materials, 32(14), 1907999. [20] Li, J., Hou, Y., Liu, Y., Hao, C., Li, M., Chaudhury, M. K., ... & Wang, Z. (2016). Directional transport of high-temperature Janus droplets mediated by structural topography. Nature Physics, 12(6), 606-612. [21] Farokhnia, N., Sajadi, S. M., Irajizad, P., & Ghasemi, H. (2017). Decoupled hierarchical structures for suppression of Leidenfrost phenomenon. Langmuir, 33(10), 2541-2550. [22] Sajadi, S. M., Irajizad, P., Kashyap, V., Farokhnia, N., & Ghasemi, H. (2017). Surfaces for high heat dissipation with no Leidenfrost limit. Applied Physics Letters, 111(2), 021605. [23] Wenzel, R. N. (1936). Resistance of solid surfaces to wetting by water. Industrial & Engineering Chemistry, 28(8), 988-994. [24] Cassie, A. B. D., & Baxter, S. (1944). Wettability of porous surfaces. Transactions of the Faraday society, 40, 546-551. [25] Carey, V. P. (1992). Liquid-vapor phase-change phenomena; Hemi-sphere: New York [26] Dupré, A., & Dupré, P. (1869). Théorie mécanique de la chaleur. Gauthier-Villars. [27] Richard, D., Clanet, C., & Quéré, D. (2002). Contact time of a bouncing drop. Nature, 417(6891), 811-811. [28] Rayleigh, L. (1879). On the capillary phenomena of jets. Proc. R. Soc. London, 29(196-199), 71-97. [29] Biance, A. L., Clanet, C., & Quéré, D. (2003). Leidenfrost drops. Physics of fluids, 15(6), 1632-1637. [30] Rayleigh, L. (1917). VIII. On the pressure developed in a liquid during the collapse of a spherical cavity. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 34(200), 94-98. [31] Forster, H. K., & Zuber, N. (1955). Dynamics of vapor bubbles and boiling heat transfer. AIChE Journal, 1(4), 531-535. [32] Plesset, M. S., & Zwick, S. A. (1954). The growth of vapor bubbles in superheated liquids. Journal of applied physics, 25(4), 493-500. [33] Scriven, L. E. (1959). On the dynamics of phase growth. Chemical engineering science, 10(1-2), 1-13. [34] Liu, T. L., & Kim, C. J. C. (2014). Turning a surface superrepellent even to completely wetting liquids. Science, 346(6213), 1096-1100. [35] Rasband, W.S., ImageJ, U. S. National Institutes of Health, Bethesda, Maryland, USA, https://imagej.nih.gov/ij/, 1997-2018. [36] 周主耀(2019)。亞努斯液滴卓越的機動能力。[碩士論文。國立交通大學] 臺灣博碩士論文知識加值系統。 https://hdl.handle.net/11296/cbnvgy。 | - |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90646 | - |
dc.description.abstract | 液滴對加熱表面的衝擊普遍存在於各種工業應用上,例如噴霧冷卻、微流道、液體收集與抗垢表面等都會應用到液滴彈跳。在處理過熱表面的情況下,防止薄膜沸騰在表面上發生,同時保持液滴高運動性對於這些應用至關重要。儘管先前的文獻已經展示了利用微奈米結構表面來抑制萊頓弗羅斯特效應,但液滴在高溫下的運動性通常無法保持,事實上,沒有任何一種表面能夠在超過500 ℃的溫度下實現液滴的自推能力、其中液滴自推能力的定義為受到過熱表面結構的影響液滴朝單一方向前進的能力。目前在工業應用上,涉及液滴撞擊過熱表面的主要挑戰包括:(1) 減少液滴的接觸時間;(2) 實現液滴的方向性自推,以防止液體在過熱表面上積累;以及 (3) 在廣泛的溫度範圍內抑制萊頓弗羅斯特效應。
在本研究中,我們提出了非對稱反摺微溝槽表面來應對上述挑戰,而微溝槽頂部有懸掛結構,這些懸掛結構類似於順時針旋轉的字母“L”,下垂的一側是雙反摺 (Double Reentrant) 懸掛結構,而水平的一側則是單反摺 (Single Reentrant) 懸掛結構,因此,在本研究中此表面被命名為非對稱反摺微溝槽 (ARG)。我們針對液滴的接觸時間、質心速度和萊頓弗羅斯特溫度點 (LFP) 進行測量後,觀察到在ARG表面上會發生液滴的拉伸彈跳,並且在400 ℃至650 ℃的溫度範圍測得約13毫秒的接觸時間,低於理論的毛細限 (Inertia Capillary Limit),表明ARG表面在高溫下降低了接觸時間的能力,而接觸時間的降低是由於液滴反彈的過程中產生對稱性的破壞所導致。同時,ARG的非對稱特性還提供了對撞擊液滴的單向自推能力,使得液滴在韋伯數為9.09時自推速度最高為0.5 m/s。ARG表面上的懸掛結構還起到阻止蒸氣層在表面上形成的作用,而表面上的溝槽則提供了一條通道,將蒸氣引導向外。因此,ARG表面能夠將萊頓弗羅斯特溫度點 (LFP) 提高至775 ℃。 ARG表面能夠在300 ℃至750 ℃的過熱表面上降低接觸時間,同時使液滴能夠達到最大0.5 m/s的自主推進速度,並在750 ℃的溫度範圍內抑制萊頓弗羅斯特效應。根據ARG結構的獨特性,ARG表面在需要液滴推進、抗垢表面、噴霧冷卻或衝擊冷卻的高過熱系統應用中具有相當的潛力。 | zh_TW |
dc.description.abstract | The impact of the droplet on heated surfaces is commonly seen in various industrial applications, such as spray cooling, microfluidics, fluid collection, and antifouling. When dealing with droplets impacting superheated surfaces, preventing film boiling from happening on the surface while maintaining high droplet mobility is crucial for these applications. Although previous literature has demonstrated Leidenfrost suppression using micro- and/or nano-structured surfaces, the droplet mobility at high temperatures is usually not retained. As a matter of fact, no surface is able to achieve high droplet mobility at a temperature beyond 500 ℃. At present, the main challenges regarding the droplet impacting a superheated surface in industrial applications include: (1) reducing the contact time of the droplet, (2) achieving directional bouncing of the droplets to prevent fluid accumulation on the surface, and (3) suppressing the Leidenfrost effect over a wide temperature range.
This work proposes the asymmetric reentrant microgroove surface to tackle these challenges. The microgroove surface consists of overhanging structures on the top of the microgroove walls. The overhanging structures resemble a clockwise rotated letter "L". The side that hangs down is the double reentrant overhanging structure, and the other side with the horizontal overhanging is the single reentrant overhanging structure. Consequently, the surface is denoted as the asymmetric reentrant groove (ARG) surface. The droplet's contact time and centroid velocity, and the Leidenfrost point (LFP) on the surface were examined. The elongated bouncing observed on the ARG surface, and a contact time of ~ 13 ms was obtained at temperatures between 400 ℃ ~ 650 ℃. This contact time was lower than the theoretical inertia-capillary limit, suggesting the ability of the ARG surface to reduce contact time at high temperatures. The contact time reduction is attributed to the breaking of symmetry in the droplet-bouncing dynamics. The asymmetric structure of the ARG also provided a force for the unidirectional self-propelling of the impacting droplet before the Leidenfrost point (LFP). The droplet's self-propelled velocity of 0.5 m/s was obtained at a Weber number of 9.09. The overhanging structure on the ARG surface also acts as a barrier preventing the vapor layer formation on the surface, while the grooves on the surface provide a pathway to channel the vapor outwards. Thus, the ARG surface could elevate the Leidenfrost point (LFP) to 775 ℃. The ARG surface could lower the contact time on a superheated surface between 300 to 750 ℃ while enabling droplets to achieve a large self-propelling speed up to 0.5 m/s and suppressing the Leidenfrost effect up to 750 ℃. Based on the unique characteristics of the ARG structure, the ARG surface is promising in applications in high-temperature thermal systems requiring droplet propulsion, antifouling, spray cooling, or impingement cooling. | en |
dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-10-03T17:00:24Z No. of bitstreams: 0 | en |
dc.description.provenance | Made available in DSpace on 2023-10-03T17:00:24Z (GMT). No. of bitstreams: 0 | en |
dc.description.tableofcontents | 誌謝 i
摘要 ii ABSTRACT iv 目錄 vi 圖目錄 viii 表目錄 xiv 符號表 xv 第一章、緒論 1 1.1 研究動機 1 1.2 文獻回顧 2 1.3 研究目標 5 第二章、基本理論 17 2.1 濕潤特性 (Wetting Behavior) 17 2.2 黏附功 (Adhesion work) 19 2.3 沸騰曲線 (Boiling curve) 19 2.4 液滴接觸時間 (Contact time) 20 2.5 萊頓弗羅斯特現象 (Leidenfrost effect) 21 2.6 氣泡動量 (Bubble Momentum) 22 第三章、 結構設計 31 3.1 表面結構設計 31 3.2 表面結構製程 32 3.3 樣品成果與表面性質分析 32 3.3.1 接觸角 33 第四章、實驗系統與實驗方法 41 4.1 液滴撞擊實驗系統 41 4.1.1 實驗系統架設 41 4.1.2 實驗方法 41 4.2 實驗數據整理 42 4.2.1 接觸時間量測辦法 42 4.2.2 質心位移量測辦法 42 第五章、 結果與討論 49 5.1 實驗結果之量化分析 49 5.1.1 ARG 液滴接觸時間 (Contact time) 49 5.1.2 ARG 液滴質心移動距離 (Centroid displacement) 50 5.1.3 ARG 質心移動速度 (Centroid velocity) 52 5.1.4 ARG 液滴最大拉伸距離 (Max elongation of a droplet) 52 5.1.5 ARG 實驗總受力 (Experimental Total Force) 53 5.2 液滴撞擊ARG表面機制 (Impact Dynamics) 55 5.2.1 黏附力 (Adhesion Force) 55 5.2.2 理論總受力 (Theoretical Total Force) 55 5.2.3 固液介面接觸面積與有效受力面積之推導與定義 56 5.3 實驗與理論結果比較 58 5.4 不同雙反摺長度結果討論 59 第六章、 結論與未來方向 75 6.1 研究總結 75 6.2 未來工作 77 參考文獻 79 附錄 83 | - |
dc.language.iso | zh_TW | - |
dc.title | 非對稱反摺微溝槽表面之液滴自推性能 | zh_TW |
dc.title | Droplet Self-propulsion on the Asymmetric Reentrant Microgroove Surface | en |
dc.type | Thesis | - |
dc.date.schoolyear | 111-2 | - |
dc.description.degree | 碩士 | - |
dc.contributor.oralexamcommittee | 王安邦;段傳華 | zh_TW |
dc.contributor.oralexamcommittee | An-Bang Wang;Chuan-Hua Duan | en |
dc.subject.keyword | 萊頓弗羅斯特現象,非對稱雙反摺結構,液滴自推,氣泡動量,過熱表面,疏水表面,半導體製程, | zh_TW |
dc.subject.keyword | Leidenfrost Effect,Single & Double Reentrant Structure,Droplet self-propulsion,Bubble momentum force,Superheated Surface,Hydrophobic Surface,Semi-conductor producing process, | en |
dc.relation.page | 93 | - |
dc.identifier.doi | 10.6342/NTU202303808 | - |
dc.rights.note | 同意授權(全球公開) | - |
dc.date.accepted | 2023-08-12 | - |
dc.contributor.author-college | 工學院 | - |
dc.contributor.author-dept | 機械工程學系 | - |
顯示於系所單位: | 機械工程學系 |
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