Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2380
標題: 液滴撞擊在不同特性的液膜之實驗分析
Experimental Analysis of Droplet Impacting on Liquid Film with Different Properties
作者: 林立堯
Lin, Li-Yao
關鍵字: impacting droplet;撞擊液滴;liquid film;cavity structure;液膜;空腔結構
出版社: 機械工程學系所
引用: 1. Thomson, J. J. and Newall, H. F., On the Formation of Vortex Rings by Drops Falling into Liquids, and Some Allied Phenomena. Proceedings of the Royal Society of London, 1885. 39, pp. 417-436. 2. Worthington, A. M., A study of splashes. 1908 : Longman, Green, and co. 3. Gregory, P. H., Guthrie, E. J., and Bunce, M. E., Experiments on splash dispersal of fungus spores. Journal of General Microbiology, 1959. 20(2), pp. 328-354. 4. Engel, O. G., Initial Pressure, Initial Flow Velocity, and the Time Dependence of Crater Depth in Fluid Impacts. Journal of Applied Physics, 1967. 38(10), pp. 3935-3940. 5. Macklin, W. C. and Metaxas, G. J., Splashing of drops on liquid layers. Journal of Applied Physics, 1976. 47(9), pp. 3963-3970. 6. Rodriguez, F., Some drops don''t splash. Journal of Colloid and Interface Science, 1985. 106(2), pp. 347. 7. Mundo, C., Sommerfeld, M., and Tropea, C., Droplet-wall collisions: experimental studies of the deformation and breakup process. International Journal of Multiphase Flow, 1995. 21(2), pp. 151-173. 8. Mundo, C., Sommerfeld, M., and Tropea, C., On the modeling of liquid sprays impinging on surfaces. Atomization and Sprays: Journal of the International Institutions for Liquid Atomization and Spray Systems, 1998. 8(6), pp. 625-652. 9. Rein, M., Phenomena of liquid drop impact on solid and liquid surfaces. Fluid Dynamics Research, 1993. 12(2), pp. 61-93. 10. Rein, M., The transitional regime between coalescing and splashing drops. Journal of Fluid Mechanics Digital Archive, 1996. 306(-1), pp. 145-165. 11. Wang, A. B. and Chen, C. C., Splashing impact of a single drop onto very thin liquid films. Physics of Fluids, 2000. 12(9), pp. 2155-2158. 12. Manzello, S. L. and Yang, J. C., An experimental study of a water droplet impinging on a liquid surface. Experiments in Fluids, 2002. 32(5), pp. 580-589. 13. Fujimatsu, T., Fujita, H., Hirota, M., and Okada, O., Interfacial deformation between an impacting water drop and a silicone-oil surface. Journal of Colloid and Interface Science, 2003. 264(1), pp. 212-220. 14. Fedorchenko, A. I. and Wang, A. B., On some common features of drop impact on liquid surfaces. Physics of Fluids, 2004. 16(5), pp. 1349-1365. 15. Pan, K. L., Cheng, K. R., Chou, P. C., and Wang, C. H., Collision dynamics of high-speed droplets upon layers of variable thickness. Experiments in Fluids, 2008. 45(3), pp. 435-446. 16. Watanabe, Y., Saruwatari, A., and Ingram, D. M., Free-surface flows under impacting droplets. Journal of Computational Physics, 2008. 227(4), pp. 2344-2365. 17. Roux, D. C. D. and Cooper-White, J. J., Dynamics of water spreading on a glass surface. Journal of Colloid and Interface Science, 2004. 277(2), pp. 424-436. 18. The Dow Chemical Company (http://www.dow.com/) 19. 黃文欽, 液滴與液膜交互作用之研究. 1999, 國立台灣大學應用力學研究所. 20. 陳祈彰, 液滴撞擊液膜之飛濺臨界邊界研究. 1999, 國立台灣大學應用力學研究所. 21. 彭馨瑩, 液滴撞擊平板及液膜之數值研究. 2006, 國立台灣大學應用力學研究所.
摘要: 
本研究主要利用高速攝影機拍攝落下液滴撞擊具有不同厚度之液膜的過程,藉由影像擷取以及影像處理探討液滴撞擊於液膜後,空腔結構的擴展深度、擴展直徑、結構回縮速度以及在液面上產生液柱的型態,期望能瞭解不同參數的變化時,空腔結構與液柱隆起型態的異同。本實驗的控制參數為液膜的黏滯係數以及厚度。
實驗結果發現:(a)在撞擊階段(t*<3):液膜的成分以及厚度不會影響空腔結構的發展;但是在撞擊階段進入發展階段的時間則會隨著黏滯係數增加而提前;(b)在發展階段(38):液膜的黏滯係數與厚度並不會影響空腔結構回縮的趨勢,但若液膜之黏滯係數較高,其空腔結構在回縮階段所具有的擴展深度則會較低。

This study investigates the temporal characteristics of an impinging droplet onto liquid film of different thickness and various properties via a high speed camera. The depth, the diameter, the receding velocity of the cavity structure and the form of the central jet above the liquid film are the subjects of primary interest. Four liquid film thickness, six different properties are employed to realize the transient behavior of the impinging droplet onto these liquid films.

The experimental results show that: (a) During the impacting stage (t * <3): the property and the film thickness will not strongly affect the development of the cavity structure; but the time while the impact stage ends maybe longer or shorter depending upon the viscosity of the liquid film. (b) In the developing stage (3 8): the differences between the viscosity and the film thickness of the liquid film will not strongly affect the of withdrawing trend. However, if the viscosity of the liquid film increases, the penetration depth the cavity structure will decrease.
URI: http://hdl.handle.net/11455/2380
其他識別: U0005-2808200920294400
Appears in Collections:機械工程學系所

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