研究生: |
林昉瑆 Fang-Hsing Lin |
---|---|
論文名稱: |
液滴撞擊平板之行為探討-高速攝影 A Study on the Droplet Impact Behavior –High Speed Image Acquisition |
指導教授: |
林析右
Shi-Yow Lin |
口試委員: |
王孟菊
Meng-Jiy Wang 蔡瑞瑩 Ying-ruei Tsai |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 50 |
中文關鍵詞: | 高速攝影 |
外文關鍵詞: | High Speed Image Acquisition |
相關次數: | 點閱:160 下載:4 |
分享至: |
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
液滴撞擊固體平板上之研究已逾一世紀,許多文章已討論不同物理條件對液滴擴
張的影響結果。例如:增加撞擊速度或液滴直徑會使撞擊後擴張速度加快;增加表面
能或液體黏度將會使擴張速度減緩等。
本研究探討兩個議題:(1)平板效應−−使用五種不同材質的平板,其純水液體在
不同平板上之平衡接觸角之大小依序為paraffin>Teflon>rough glass>quartz>clean
glass。使純水液滴撞擊平板,再從中分別探討較親水與較疏水材質間的差異。;(2)
界劑效應−−使用不同界劑水溶液液滴撞擊於乾淨玻璃平板上,液滴撞擊平板後,擴張
的過程表面積為原來滴落液滴的6~10 倍,分別比較不同表面張力液滴於撞擊固體平
板後,液滴擴張的的情況。
利用高速攝影取像、並從液滴影像所取得之液滴邊界,分別計算出D0(液滴直
徑)、u0(撞擊速度)、t0(接觸影像時間),再以θ(接觸角)、d(擴張直徑)、H(振
蕩高度)對t (時間)與spreading factor (d/D0)、apex factor (H/D0)對dimensionless time
(tu0/D0)作圖。實驗結果可分成kinetic phase, spreading phase, relaxation phase,
asymptotic state 四部份來探討之。本研究並利用45 度俯角所得之液滴影像,比對液
滴影像側視圖,來觀察液滴頂端與內測凹陷行為。
The investigation on the droplet impact behavior has been proceeded for more than
several decades. Several different factors affecting the spreading behavior of the impinging
droplet have been reported, such as the initial impact velocity, droplet size, liquid viscosity,
and the surface property of solid.
Two major issues were studied in this work: surface effect and surfactant effect. In
the first part, water droplet impinges five different solid surfaces at a fix initial impact
velocity. The spreading behaviors were then investigated for these five solid surfaces with
different hydrophobicity. The equilibrium contacts of these five surfaces were
paraffin>Teflon>rough glass>quartz>clean glass. In the second part of this work, aqueous
droplets consisting of different surfactants with surface tension impinge the clean glass
surface. The spreading behaviors were then studied to check the effect of tension and
surfactant.
The experiments were performed by using a high speed CCD. 2905 images per
second were captured sequentially. The drop profiles were then obtained from the drop
images. Information D0 (initial diameter), u0 (impact velocity), t0 (impact image), θ
(contact angle), d (spreading diameter), H (apex height) were further resulted from the
drop profiles. The relationship between the dimensionless groups (spreading factor, d/D0;
apex factor, H/D0; time, tu0/D0) was investigated. The images captured from 45 degree top
view were also compared with the silhouette to detail the concavity of impinging droplet.
1. Rioboo, R. ; Tropea, C. ”Outcomes from a drop impact on solid surface,” J. Intern.
Inst. Liquid Atomization Spray Sys., 2001, 11, 98-110.
2. Dukhin, S.S.; Kretzschmar, G.; Miller, R., “Dynamics of Adsorption at Liquid
interfaces,” Amsterdam, Elsevier, 1995, New York, 1st Ed..
3. Lee, Y. C.; Liou, Y. B.; Miller, R.; Liu, H. S.; Lin, S. Y., “Adsorption kinetics of
nonaol at the air-water interface : Considering nolevular interacton or
aggregation within surface within surface layer,” Langmuir 2002, 18, 2686.
4. Adamson, W., ”Physics and Chemistry of Interfaces,” 1982, 4th Ed..
5. 邱明崑,〝苯甲醇可溶化現象之探討〞,國立臺灣大學化學工程研究所碩士
論文,2006。
6. 許敬添,〝非離子型界面活性劑之吸附動力學研究:分子間作用力對質傳機
制的影響〞,國立臺灣大學化學工程研究所博士論文,1999。
7. Eastman, J. R.; Goodwin, J. W.; Howe, A. M., “Extensional viscosity of aqueous
solutions of SDS and PVP measured on the rheometrics RFX,” Colloids surf. A,
2000, 161, 329–338.
8. Šikalo, Š.; Tropea, C.; Gannić, E. N., “Analysis of impact of droplets on horizontal
surfaces,” Exp. therm. fluid sci., 2002, 25, 503-510.
9. Rein, M., “Phenomena of liquid drop impact on solid and liquid surfaces,” Fluid
Dyn. Res., 1993, 12, 61–93.
10. Rioboo, R.; Marengo, M.; Cossali, G. E.; Tropea, C., “Comparison of drop impact:
dry and wetted cases,” Proc. ILASS conference, 2000, 8, 171-180.
11. Rioboo, R.; Marengo, M., “Outcomes from a drop impact on solid surfaces,” J.
Intern. Inst. Liquid Atomization Spray Sys., 2001, 11, 155–166.
12. Zhang, X.; Basaran, O. A., “Dynamic surface tension effects in impact of a drop
with a solid surface,” J. Colloid Interface Sci., 1997, 187, 166–178.
13. Rioboo, R.; Adaǒ, M.; Voue, H. M., “Experimental evidence of liquid drop
break-up in complete wetting experiments,” J. Mater Sci., 2006, 41, 5068–5080.
14. Rioboo, R.; M.; Marengo, C., “Time evolution of liquid drop impact onto solid, dry
surfaces,” Exp. Fluid, 2002, 33, 112-124.
15. Ukiwe, C.; Kwok, D. Y., “On the maximum spreading diameter of impacting
droplets on well-prepared solid surfaces,” Langmuir, 2005, 21, 666-673.
16. Rioboo, R.; Bauthier, C.; Conti, J.; Voué, M.; Coninck, J. De., “Experimental
investigation of splash and crown formation during single Drop Impact on Wetted
Surfaces,” Exp. Fluids, 2003, 35, 648–652.
17. Rein, M., “Phenomena of liquid drop impact on solid and liquid surfaces”, Fluid
Dyn. Res., 1993, 12, 61-93.
18. Renardy, Y.; Popinet, S.; Duchemin, L., “Pyramidal and toroidal water drops after
impact on a solid surface,” J. Fluid Mech., 2003,484, 69-83.
19. Bahr, M.; Tiberg, F.; Zhmud, B., “Spreading dynamics of surfactant solutions,”
Langmuir, 1999, 15, 7069-7075.
20. Healy, W. M.; Hartley, J. G.; Abdel-Khalik, S. I., “Surface wetting effects on the
spreading of liquid droplets impacting a solid surface at low Weber numbers,” Int.
J. Heat Mass Transfer., 2001, 44, 235-240.
21. Fujimoto, H.; Tong, A. Y.; Takuda, H., “Interaction phenomena of two water
droplets successively,” Int. J. Thermal Sci., 2008, 47, 229-236.