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標題: 微流道內兩相流之動態數值模擬
Simulation of Two-phase Flow in Rotating Microchannels
作者: 陳炯翰
Chen, Jyong-Han
關鍵字: two phase flow;兩相流;oval-disk shaped chamber:t-shaped channel;droplet;胃形槽;T形流道;液滴
出版社: 機械工程學系所
引用: Bui A., and Zhu Y., “Numerical Study of Droplet Generation in A Complex Micro-Channel,” Proceedings of 15th Australasian Fluid Mechanics Conference, December, 2-7, 2007, Crown Plaza, Gold Coast, Australia. Chen J. J., Liu W. Z., Lin J. D., Wu J. W., “Analysis of an Oval Disk-shaped Chamber with Microfluidic Flows,” Sensors and Actuators, Vol. 132, 2006, pp. 597-606. Cramer C., Fischer P., and Windhab E. J., “Drop formation in a Co-flowing Ambient Fluid,” Chemical Engineering Science,” Vol. 59, 2004, pp. 3045-3058. Cubaud T., Ulmanella U., Ho C. M., “Two-phase Flow in Microchannels with Surface Modifications,” Fluid Dynamics Research, Vol. 38, 2006, pp. 772-786. Danov K. D., Danova D. K., and Kralchevsky P. A., “Hydrodynamic Forces Acting on a Microscopic Emulsion Drop Growing at Capillary tip in Relation to the Process of membrane Emulsification,” Journal of Colloid and Interface Science, Vol. 316, 2007, pp.844-857. Garstecki P., Fuerstman M. J., Stone H. A., and Whitesides G. M., “Formation of Droplets and Bubbles in a Microfluidic T-junction,” Lab on a Chip, Vol. 6, 2006, pp. 437-446. Günther A., and Jensen K. F., “Multiphase Microfluidics: from Flow Characteristic to Chemical and Materials Synthesis,” Lab on a Chip, Vol. 6, 2006, pp. 1487-1503. Haeberle S., Zengerle R., and Ducrée J., “Centrifugal Generation and Manipulation of Droplet Emulsions,” Microfluid and Nanofluid, Vol. 3, 2007, pp. 65-75. Husny J., and White J. J., ”The Effect of Elasticity on Drop Creation in T-shaped Microchannels,” J. Non-Newtonian Fluid Mech, Vol. 137, 2006, pp. 121-136. Kang J. H., Kim Y. C., and Park J. K., “Analysis of Pressure Driven Air Bubble Elimination in a Microfluidic device,” Lab on a Chip, Vol. 8, 2008, pp. 176-178. Kim D. S., Lee K. C., and Kwon T. H., ”Micro-channel Filling Flow Considering Surface Tension Effect,” Journal of Micromechanics and Microengineering, Vol. 12, 2002, pp. 236-246. Link D. R., Anna S.L., Weitz D. A., and Stone H. A., “Geometrically Mediated Breakup of Drops in Microfluidic Devices,” Physical Review Letters, Vol. 92, No. 5, 2004, pp. 3247-3251. Liow J., “Numerical Simulation of Drop Formation in a T-shaped Microchannel,” Proceedings of 15th Australasian Fluid Mechanics Conference, December, 13-17, 2004, Sydney, Australia. Menech M., Garstecki P., and Jousse F., “Transition from Squeezing to Dripping in a Microfluidic T-shaped Junction.” J. Fluid Mech, Vol. 595, 2008, pp. 141-161. Miao J. M., Chen J. Y., Lih F. L., and Sheu T. S., “The Study of Generation and Control Mechanism in Two-phase Micro-droplet Formation,” WHAMPO-An Interdisciplinary Journal, Vol. 53, 2007, pp. 101-110. Nisisako T., Torii T., and Higuchi T., “Formation of Liquid Droplets in a Microchannel Network for Microreactor Applications,” Lab on a Chip, Vol. 2, No.1, 2002, pp. 24-26. Reddy S., Schunk P. R., and Bonnecaze R. T., “Dynamics of Low Capillary Number Interfaces Moving Through Sharp Features,” Physics of Fluids, Vol. 17, 2005, pp.17-23. Shui L. L., Eijkel C. T., and Berg V. D., “Multiphase Flow in Microfluidic System - Control and Applications of Droplets and Interfaces,” Advances in Colloid and Interface Science, Vol. 133, 2007, pp.35-49. Thorsen T., Roberts R. W., Arnoki F. H., and Quake S. R., “Dynamic Pattern Formation in a Vesicle-Generating Microfluidic Device,” Physical Review Letters, Vol. 86, No. 18, 2001, pp. 4163-4166. Wang A. B., Chen S. S., Sung P. F., Lin I. C., Chen C.C., and Fedorchenko A. I., “The Study of Drop-Surface Interactions,” Bulletin of the College of Engineering, N.T.U., No.91, 2004, pp. 103-115. Zheng Y., Fujioka H., and Grotberg J. B., “Effects of Gravity, Inertia, and Surfactant on Steay Plug Propagation in a Two-Dimensional Channel,” Physics of Fluids, Vol. 19, 2007.
本研究利用流體力學軟體Fluent 6.3為數值工具,模擬兩相流體在旋轉微流道內的動態界面現象。幾何構形分為胃型槽與T形流道。首先探討胃型槽在旋轉流場下的填充現象,模擬結果顯示轉速的差異不影響填充過程。增加轉速會加快填充的速度,而界面移動過程則受到親疏水性壁面的影響。再分別以十四烷與葵花油為連續相,水為消散相,模擬靜止T形流道的液滴產生現象。結果發現增加連續相速度可以使液滴體積變小,加快消散相速度則會使液滴體積變大。增加界面張力值可使界面足以承受較大的壓力,因此形成的液滴體積較大,若降低界面張力值則液滴體積較小。最後我們利用旋轉所產生的離心力驅動水與葵花油,配合不同的T形流道置放角度可以改變入口速度。轉速不影響水與葵花油的速度比,藉由速度差異改變截斷液滴的大小。

This study adopts the computational fluid dynamics software Fluent 6.3 as a tool to examine the interaction of two phase flow in rotating microchannels. The fabrication categorized two things, one is oval disk-shaped chamber another is T-shaped channel. In the simulations of the filling of oval disk-shaped chamber undergoing rotation, it is found that the rotation speed appears to have indiscernible influence on the filling process. However, the movement of the liquid-air interface varies for hydrophilic or hydrophobic channels. In the droplet generation simulations from the T-shaped channel, teradecane or sunflower oil was used as continuous phase and water as dispersed phase. It is found that an increase of the continuous phase velocity or a decrease of dispersed phase velocity produces droplets of smaller volume. It is also found that an increase of the interfacial tension leads to the generation of larger droplets. In the case of rotation, the inlet velocities of the continuous and dispersed phases can be varied by using different angle of T-shaped channel to the radial direction. For a fixed angle between the T-channel and the radial direction, the rotation speed does not change the ratio of the velocities of the two different phases.
其他識別: U0005-2608200816464500
Appears in Collections:機械工程學系所

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