Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1757
標題: 微管液滴之可視化實驗
Visualization of forming droplet in micropipe
作者: 陳春億
Chen, Chun-Yi
關鍵字: surface tension;液滴;liquid drop;pressure barrier;突破壓力;表面張力
出版社: 機械工程學系所
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[5] Basaran, O., A., “Small-Scale Free Surface Flows with Breakup: Drop Formation and Emerging Applications,” AIChE Journal, Vol. 48, No. 9, 2002, pp. 1842-1848. [6] Brenner, M., P., Eggers, J., Joseph, K.,, Nagel, S., R., and Shi, X., D., “Breakdown of scaling in droplet fission at high Reynolds number,” Physics of Fluids, Vol. 9, No. 6, 1997, pp. 1573-1590. [7] Chen, A., U., Notz, P., K., and Basaran, O., A., “Computational and Experimental Analysis of Pinch-Off and Scaling,” The American Physical Society, Vol. 88, No. 17, April 29, 2002, pp. 1-4. [8] Davidson, M., R., and Cooper-White, J., J., “Numerical Prediction of Shear-Thinning Drop Formation,” Proceedings of Third International Conference on CFD in the Minerals and Process Industries, CSIRO, Melbourne, Australia, December 10-12, 2003, pp. 403-407. [9] Fawehinmi, O.,B., Gaskell, P., H., Jimack, P., K., Kapur, N., and Thompson H., M., “A Combined Experimental and Computational Fluid Dynamics Analysis of the Dynamics of Drop Formation,” Proceedings of IMechE, Vol. 219, 2005, pp. 1-15. [10] Furbank, R., J., and Morris, J., F., “An Experimental Study of Particle Effects on Drop Formation,” Physics of Fluids, Vol. 16, 2004, pp. 1777-1790. [11] Gutmann, O., Niekrawietz, R., Kuehlewein, R., and Steinert, C., P., “Impact of Medium Properties on Droplet Release in a Highly Parallel Nanoliter Dispenser,” Sensors and Actuators A, Vol. 116, 2004, pp. 187–194. [12] Gutmanna, O., Niekrawietza, R., Steinerta, C. P., and Sandmaierb, H., “Droplet Release in a Highly Parallel, Pressure Driven Nanoliter Dispenser,” Proceedings of the 12th International Conference on Solid State Sensors, Actuators and Microsystems, Boston, June 8-12, 2003, pp. 364-367. [13] Henderson, D., Segur, H., Smolka, L., B., and Wadati, M., “The Motion of a Falling Liquid Filament,” Physics of Fluids, Vol. 12, No. 3, 2000, pp. 550-565. [14] Henderson, D., M., Pritchard, W., G., and Smolka, L., B., “On the Pinch-off of a Pendant Drop of Viscous Fluid,” Physics of Fluids, Vol. 9, No. 11, 1997, pp. 3188-3200. [15] Kim, J., and Golliher, E., “Steady State Model of a Micro Loop Heat Pipe,” Proceedings of the 18th IEEE SEMI-THEM Symposium, 2002. [16] Lister, J., R., and Stone, H., A., “Capillary breakup of a viscous thread surrounded by another viscous fluid,” Physics of Fluids, Vol. 10, No. 11, 1998, pp. 2758-2764. [17] Man, P. F., Mastrangelo, C. H., Burns, M. A., and Burke, D. T., “Microfabricated Capillarity-Driven Stop Valve and Sample Injector”, Proceedings of 1998 MEMS Conference, Heidelberg, Germany, January 25-29, 1998. [18] Muraok, I., Ramos, F., and Vlassov, V., “Experimental and Theoretical Investigation of a Capillary Pumped Loop with a Porous Element in the Condenser”, Int. Comm. Heat Mass Transfer, Vol. 25, No. 8, 1998, pp. 1085-1094. [19] Paik, P., Pamula, V. K., and Chakrabarty, K., “Thermal Effects on Droplet Transport in Digitial Microfluidics with Applications to Chip Cooling,” Proceedings of Inter Society Conference on Thermal Phenomena, IEEE, 2004. [20] Pan, Y., and Suga, K., “Capturing the Pinch-off of Liquid Jets by the Level Set Method,” ASME, Vol. 125, September, 2003, pp. 922-930. [21] Prodanovic, V., Fraser, D., and Salcudean, M., “On the Transaction from Partial to Fully Developed Subcooled Flow Boiling,”. Int. J. Heat Mass Transfer, Vol. 45, 2002, pp. 4727-4738. [22] Richards, J., R., Beris, A., N., and Lenhoff, A., M., “Drop Formation in Liquid–Liquid Systems Before and After Jetting,” Physics of Fluids, Vol. 7, November, 1995, pp. 2617-2630. [23] Smolka, L., B., and Belmonte, A., “Drop Pinch-off and Filament Dynamics of Wormlike Micellar Fluids,” Journal of Non-Newtonian Fluid Mechanics, Vol. 115, 2003, pp. 1–25. [24] Subramani, H., J., Yeoh, H., K., Suryo, R., and Xu, Q., “Simplicity and Complexity in a Dripping Faucet,” Physics of Fluids, Vol. 18, 2006. [25] Tso, C. P., and Sundaravadivelu, K., “Capillary Flow Between Parallel Plates in The Presence of an Electromagnetic Field,” Journal of Physics D: Applied Physics, Vol. 34, 2001, pp. 3522-3527. [26] Wen, D. S., and Wang, B. X., “Effects of Surface Wettability on Nucleate Pool Boiling Heat Transfer for Surfactant Solutions,” Int. J. Heat Mass Transfer, Vol. 45, 2002, pp. 1739-1747. [27] Wenzel, U., Hartmuth, B., and Muller-Stainhagen, H., “Heat Transfer to Mixtures of Acetone, Isopropanol and Water under Subcooled Flow Boiling Conditions - I. Experimental Results,” Int. J. Heat Mass Transfer, Vol. 37, 1994, pp. 175-183. [28]Wilkes, E., D., Phillips, S., D., and Basaran, O., A., “Computational and Experimental Analysis of Dynamics of Drop Formation,” Physics of Fluids, Vol. 11, No. 12, 1999, pp. 3577-3598. [29] Yildirim, O., E., Xu, Q., and Basaran, O., A., “Analysis of the Drop Weight Method,” Physics of Fluids, Vol. 17, 2005, pp. 1-5. [30] Zeng, J., Deshpande, M., Greiner, K., B., and Gilbert, J., R., “Fluidic Capacitance Model of Capillary-Driven Stop Valves,” Proceedings of ASME International Mechanical Engineering Congress and Exposition, 2000, pp. 1-7. [31] 黃柏鈞, “旋轉微流道閥門可視化及雷射偵測,” 中興大學碩士論文, 2005
摘要: 
本研究主要利用微噴嘴液滴之理論,分析毛細管噴口擴張角與突破壓力之間的關係。理論分析針對流體流經軸對稱漸闊管的三個區間:直流道、流道截面變化起點、及流道漸闊區域,分別利用液體與固體和氣體接觸表面能與濕潤體積的關係推導表面張力所造成壓力差,求出突破壓力與流道幾何及流體和壁面間接觸角的關係式,並且藉由這樣的關係式分析流體壓力和流體前端曲面高度的關係式。本研究以流場可視化實驗觀察流體壓力增加時,液滴形成的過程與突破壓力的關係。本文的研究結果發現,經由量測突破壓力值之實驗與理論結果之推導相當吻合。另外本文還透過流場可視化實驗觀察在平板微管流道和毛細微圓管中液滴的成長過程,分析在不同孔徑和流量下所造成的形狀體積差異。

This paper presents the analysis of the pressure that built up by surface tension in a liquid flowing through an axis-symmetric divergent micro tube. The pressure variation is determined in terms of energy change in the liquid-solid-gas interface. The interfacial energy is obtained for three regimes of the tube, namely, the uniform channel with constant cross section, the position where cross section abruptly enlarged, and the wedge region with increasing cross section. The maximum pressure barrier developing to stop the liquid flow is found as a function of the channel geometry and the contact properties of the liquid-channel interface. Flow visualization experiments were set up to demonstrate the liquid flow that leads to the formation of a drop as the external pressure increases to exceed the pressure barrier. We can calculate the size of drop through the way to examine of the image amount by visual experiment, and compare the different size of droplet between the plate channel and capillary tubes.
URI: http://hdl.handle.net/11455/1757
其他識別: U0005-2908200616205100
Appears in Collections:機械工程學系所

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