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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27113完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 潘國隆(Kuo-Long Pan) | |
| dc.contributor.author | Kai-Ren Cheng | en |
| dc.contributor.author | 鄭凱仁 | zh_TW |
| dc.date.accessioned | 2021-06-12T17:55:41Z | - |
| dc.date.available | 2008-02-18 | |
| dc.date.copyright | 2008-02-18 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-02-01 | |
| dc.identifier.citation | 參考文獻
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G., “Relaxation and Break-up of an initially extended drop in an otherwise quiescent fluid,”J. Fluid Mech., Vol. 198, pp. 399- 427, 1989. [16]Pumpherey, H. C. & P.A. Elmore,“The entrainment of bubble by drop impact,”J. Fluid Mech., Vol. 220, pp. 539-567, 1990. [17]Gerardo, T. & Julian, S.,“Mathematical modeling of the isothermal impingement of liquid droplets in spraying processes,”Met. Trans. B, Vol. 22B, pp. 901- 914, 1991. [18]Chandra, S. & Avedisian, C. T.,“Observations of droplet impingement on a ceramic porous surface,”Int. J. Heat Mass Transfer, Vol. 35, No. 10, pp. 2377-2388, 1992. [19]Leger, L. & Joanny, J. F.,“Liquid spreading,”Rep. Prog. Phys., pp. 431-486, 1992. [20]Rein, M.,“Phenomena of liquid droplet impact on solid and liquid surfaces,”Fluid dynamics Research, Vol. 12, pp. 61-93, 1993. [21]Rein, M.,“The transitional regime between coalescing and splashing drops,” J. Fluid Mech., Vol. 306, pp. 145-165, 1996. [22]Cresswell, R. W. & B. R. Morton,“Drop-formed vortex rings – the generation of vorticity,” Phys. Fluids, V.7(6), pp.1363-1370 ,1995. [23]林志宏,“微小液滴撞擊平板之動態實驗研究”國立台灣大學應 用力學研究所碩士論文, 1997。 [24]Tropea, C. & Marengo, O.,“The impact of drops on wall and films”Proceeding of the Third International Conference on Multiphase Flow, ICMF ’98, lyon, France, June 8-12.,1998. [25]Fraysse, N., Valignat, M. P. & Cazabat, A. M. and Heslot, F. and Levinson, P.,“The spreading of layered microdroplets,”J. Colloid Interface Sci., Vol. 158, pp. 27-32, 1993. [26]Fukai, J., Zhao, Z. & Poulikakos, D. and Megaridis, C. M. and Miyatake, O.,“Modeling of the deformation of a liquid droplet impinging upon a flat surface,”Phys. Fluids A, Vol. 5(11), pp. 2588-2599, 1993. [27]Mundo, C., Sommerfeld, M. & Tropea, C.,“Droplet-wall collisions:experimental studies of the deformation and breakup process,”Int. J. Multiphase Flow, Vol. 21, No. 2, pp. 151-173, 1994. [28]Yarin A. L. & Weiss, D. A.,“Impact of drops on solid surfaces:self-similar capillary waves, and splashing as a new type of kinematical discontinuity,”J. Fluid Mech., Vol.283, pp. 141-173, 1995. [29]Scheller, B. L. & Bousfield, D. W.,“Newtonian drop impact with a solid surface,”AIChE Journal, Vol. 41, No. 6, pp. 1357-1367, 1995. [30]Pasandideh-Fard, M. & Qiao, Y. M. & Chandra, S. & Mostaghimi, J.,“Capillary effects during droplet impact on a solid surface,”Phys. Fluids, Vol. 8(3), pp. 650-659, 1996. [31]Qian, J. & Law, C. K.,“Regimes of coalescence and separationin droplet collision,”J. Fluid Mech., Vol. 331, pp. 59-80, 1997. [32]Cossali, G. E., Ghe, A. C. & Marengo, M.,“The impact of a single drop on a wetted solid surface,”Exp. in Fluid, Vol. 22, pp. 463-472,1997. [33]陳祈彰,“液滴撞擊液膜之飛濺臨界邊界研究”國立台灣大學應 用力學研究所碩士論文,1999。 [34]林竣斌,“液滴撞擊平板及液膜之實驗研究?國立台灣大學應用 力學研究所碩士論文,1999。 [35]Gu, Y. & Li, D.,“Liquid drop spreading on solid surfaces at low impact speeds,”Colloids and Surfaces A：Physicochemical and Engineering Aspects, Vol. 163, pp. 239-245, 2000. [36]楊建隆,“液滴撞擊液膜之現象分析”國立台灣大學應用力學研 究所碩士論文,2000。 [37]Marengo, M. & Tropea, C.,“Analysis of impact of droplets on horizontal surfaces,”Exp. Fluids, Vol. 25, pp. 503-510, 2002. [38]陳正杰,“液滴撞擊平板及半圓型液膜之動態分析與研究?國立 台灣大學機械工程研究所碩士論文,2004。 [39]彭馨瑩,“液滴撞擊平板及液膜之數值研究?國立台灣大學應用 力學研究所碩士論文,2006。 [40]潘國隆,“晶格波茲曼方法之多相流模擬：液滴碰撞?93年國科 會專題研究計畫成果報告。 [41]潘國隆,“液滴碰撞之動力學Dynamics of Droplet Collision ?94年國科會專題研究計畫成果報告。 [42]Pan, K. L. & Cheng, K. R. & Chou, P. C. & Wang C. H., “Collision dynamics of high-speed droplets upon layers of variable thickness,?Experiments in Fluids, submitted, 2007. [43]Magarvey, R. H. & Geldart, J. W.,“Drop collision under conditions of free fall,?Journal of The Atmospheric Science, Vol. 19, pp. 107-113, 1961. [44]Schneider, J. M. & Hendricks, C. D.,“Source of uniform-sized liquid droplets,?The Review of Scientific Instruments, Vol. 35, pp. 1349-1350, 1964. [45]Miller, C. A. & Neogi, P.,“Interfacial phenomena—eguilibrium and dynamic efects,?Surfactant Science Ceries, Vol. 17, 1985. [46]Stow, C. D. & Hadfield, M. G.,“An experimental investigation of fluid flow resulting from the impact of a water drop with an unyielding dry surface,?Proc. R. Soc. London A, Vol. 373, pp. 419-441, 1981. [47]余傳濬,“純水層液柱噴流於斜向對撞後所形成之液頁流場之實 驗與理論研究?國立台灣大學機械工程研究所,2007。 [48]Rayleigh L.,“On the Instability of Jets?,Proc. London Math Soc., Vol. 10, no. 4, pp. 4-13, 1878. [49]Rayleigh L.,“On the Instability of a Cylinder of Viscous Liquid Under Capillary Force?,Philosophical Magazine., Vol. 34, p. 145, 1892 [50]Pan K. L. & Law C. K., “Dynamics of droplet-film collision?J. Fluid Mech., Vol. 587, pp. 1-22, 2007. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27113 | - |
| dc.description.abstract | 本文首先突破過去文獻中僅能使用低速液滴撞擊液膜，從而建立一套高速且穩定的液滴產生系統，同時在實驗中，使用界面活性劑，去改變純水的表面張力，控制液滴尺寸及液滴瞬時速度，來觀察在不同的韋伯數下，液滴碰撞液膜之物理現象。由本文之結果證實這些努力大幅提高此種實驗結果的重複性及精度，並觀察到液滴在高速下撞擊液膜之物理現象-閉合現象(Closed)。在此吾人使用高速攝影機去拍攝撞擊過程，來了解當中之物理機制及物理意義；本實驗著重於兩個部份，一為高速液滴的生成，如何切截出最佳長度液柱，來拉伸為液滴；另一為工作流體之表面張力之變化對撞擊後之影響；此文為首度將撞擊結果整理成一套數據，來繪出其邊界圖。
由本文之實驗結果發現：高速液滴產生系統，在切截過程中，液柱長度及半徑將影響液滴之生成時間，使得在落下後速度減慢，造成韋伯數下降，因此最佳長度將極為重要；另外對於實驗結果，繪出一分界圖，將所有物理現象隨著韋伯數與無因次薄膜厚度之改變劃分為五個區域(Ⅰ) Merging (Ⅱ) C-J (Ⅲ) C-J and 2nd (Ⅳ) Multiple (Ⅴ) Closed，並特別繪出飛濺現象發生時之分界線，最後改變兩次表面張力，進而討論兩種溶液在撞擊後會否產生與水不同之現象，以及探討三者數據圖之分界趨勢，來了解改變表面張力，對現象之影響。 | zh_TW |
| dc.description.abstract | The main objective of this study is experimental investigation of the droplet-film collision under the conditions of different surface tension and different Weber number. In the experiment, we control the size and the colliding velocity of droplet. To change the surface tension of water, the surfactant was used. In present experimental study, the special attention is given to the generation of high-speed droplets, including which is the best cut-off length of liquid jet in order to form droplets. Secondly, the phenomena of impingement after droplet impacts the liquid film with different surface tension is also in the focus of this investigation. The experimental results of droplet-film impact are presented in this thesis. The dependencies of splashing threshold on different surface tension are obtained.
It was found that both the length and the cross-sectional radius of liquid jet significantly affect the forming time of droplets during the cut-off process under high speed conditions. They cause the decrease in the droplet velocity and therefore, the decrease in the Weber number. Base on it, one can conclude that the optimal cut-off length is consequently important. Depend on the changes of Weber number and non-dimensional thickness (H), the five characteristic regimes may be singled out: (I) Merging, (II) C-J, which implies center-jet, (III) C-J and 2nd droplet, (IV) Multiple droplets, and (V) Closed. The influence of surface tension on impinging phenomena is discussed in this thesis. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-12T17:55:41Z (GMT). No. of bitstreams: 1 ntu-97-R94522311-1.pdf: 27623569 bytes, checksum: 147b8e0578e61e63d758f0b236d7f2ab (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | 本文目錄
中文摘要 I 英文摘要 III 圖形目錄 VII 符號說明 XIII 第一章 緒論 1 1-1 前言 1 1-2 文獻回顧 2 1-3 研究動機及目的 11 第二章 實驗裝置 12 2-1液滴產生裝置 12 2-1-1液滴產生方式 12 2-1-2流體供應系統 13 2-1-3液柱切截系統 15 2-2液滴撞擊機構 16 2-3影像拍攝系統 17 2-3-1攝影儀器 18 2-3-2鏡頭組 18 2-3-3光源裝置 19 2-4影像處理系統 20 2-5實驗測量儀器 21 2-6界面活性劑 22 第三章 實驗步驟與原理 24 3-1實驗步驟 24 3-2實驗數據存取與誤差分析 29 3-3實驗原理與理論 31 3-3-1液體表面張力之理論 31 3-3-2液柱噴速之計算流量理論 32 3-3-3撞擊理論 33 3-3-4液柱拉伸斷裂理論 34 3-3-5低速液柱之斷裂理論 34 3-4速度變化分布 35 第四章 實驗結果與討論 36 4-1高速液柱切截結果 36 4-1-1最佳切截長度 36 4-1-2液滴生成落下後震盪變化之過程 37 4-2實驗結果之物理現象 38 4-2-1物理現象之介紹及解釋 38 4-2-2重新定義門檻 41 4-3三種溶液之液滴撞擊液膜的現象與圖形分布之趨勢 43 4-4三種溶液之液滴撞擊乾平板的現象與圖形分布 46 4-5總結三種溶液之不同 47 第五章 結論 49 參考文獻 52 圖表 56 圖形目錄 圖1.2.1單一液滴撞擊介面之分類與現象示意圖 56 圖1.2.2液滴撞擊液膜產生飛濺現象之示意圖 57 圖1.2.3 | |
| dc.language.iso | zh-TW | |
| dc.title | 不同表面張力水溶液之高速液滴與薄膜碰撞研究 | zh_TW |
| dc.title | High-Speed Impact of Water Droplet upon Wet Surface with Different Surface Tension | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王興華(Ching-Hua Wang),賴君亮(Chun-Liang Lai) | |
| dc.subject.keyword | 液滴碰撞,高速液滴,表面張力,韋伯數,界面活性劑, | zh_TW |
| dc.subject.keyword | droplet collision,high-speed droplet,surface tension,Weber number,surfactant, | en |
| dc.relation.page | 148 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-02-02 | |
| 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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