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Simulation of Two-phase Flow in Rotating Microchannels
|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.||摘要:||
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.
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