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Visualization of forming droplet in micropipe
|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||引用:|| Admiak, K., “Capillary and Electrostatic Limitations to the Contact Angle in Electrowetting-on-Dielectric,” Microfluid Nanofluid, 2006  Ambravaneswaran, B., Phillips, S., D., and Basaran, O., A., “Theoretical Analysis of a Dripping Faucet,” The American Physical Society, Vol. 85, No. 25, December 18, 2000, pp. 5332-5335.  Ambravaneswaran, B., Wilkes, E., D., and Basaran O., A., “Drop Formation from a Capillary Tube: Comparison of One-Dimensional and Two-Dimensional Analyses and Occurrence of Satellite Drops,” Physics of Fluids, Vol. 14, No. 8, 2002, pp. 2606-2621.  Amon, C. H., Murthy, J., Yao, S. C., Narumanchi, S., Wu, C.-H., and Hsieh, C.-C., “MEMS-Enabled Thermal Management of High-Heat-Flux Devices Edifice: Embedded Droplet Impingement for Integrated Cooling of Electronics,” Experimental Thermal and Fluid Science, Vol. 25, 2001, pp. 231-242.  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Yildirim, O., E., Xu, Q., and Basaran, O., A., “Analysis of the Drop Weight Method,” Physics of Fluids, Vol. 17, 2005, pp. 1-5.  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.  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:||
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.
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