流體在喉口管內流動模擬

本文探討喉口型毛細管中液體流動現象之模擬，研究工具利用ESI-CFD套裝軟體，研究中利用四種不相同之流體（水、甲醇、丙酮、環己烷），尋找液體之密度、黏度、表面張力、與接觸角，作為參數，設定帶入模擬器中，在第一階段的研究中發現，可以有效的利用ESI-CFD模擬出四種不同的流體在毛細管中的流動行為與現象。在第二階段內，利用調整參數的方法，研究表面張力與黏度對於毛細現象的影響。結果結果指出，水的最大速度為 0.317 m/s ，若單獨把表面張力放大後，可以有效的提升毛細管中液體流動的速度，最快速度可以提升到1.120 m/s ，若將表面張力縮小，則最大速度將會減少到 0.072 m/s ，研究結果指出，表面張力對於毛細現象，是一重要參考因素。變更另一參數，黏度，將黏度放大後發現，最大速度只有 0.178 m/s ，當黏度縮小時，發現最大速度會變快到 0.385 m/s ，雖然黏度縮小，對於最大速不並沒有太多的幫助，但是在流體流動的過程與行為上，黏度依舊是重要的影響參數。在加速度的變化中，也發現到，在最小管徑處，會產生加速度，說明了，在結構上面的變化，會嚴重的影響流體的行為表現。

關鍵字

微機電系統； CFD ； VOF-model ；表面張力

並列摘要

We have studied the liquid flow phenomenon into the threat channel using theoretical computer simulation and actual experimental look four different liquids : water , methanol , acetone , cyclohexane were investigated with report to their density , viscosity , surface tension and contact angle . At part 1 : we find out that ESI-CFD software to be simulated by this four fluids have nice result . At part 2 : according to this report change parameters of viscosity and surface tension of fluid flow in the capillary .Water of maximum velocity is 0.317 m/s in the channel . Now we change the surface tension in increase . We can effective to increase the fluid velocity in this channel . The fluid of velocity can be increased to 1.120 m/s. The other way of this surface tension be weak , the maximum of velocity be reduced to 0.072 m/s .The parameter of surface tension is important in capillarity . When we to change the another parameter of viscosity . We can be result the velocity of change in this channel . when the viscosity be strong ,the velocity be reduced to 0.178 m/s . When the viscosity be weak the velocity would be increased to 0.385 m/s . This viscosity is important parameter even though it affects the maximum velocity be weak . Final we can see the acceleration of change in the channel . When the fluid through the minimum radius , the acceleration be a negative quantity . Result the structure of change affects the fluid flow phenomenon into the channel .

並列關鍵字

MEMS ； CFD ； VOF-model ； surface-tension

參考文獻

[1] J. Fortin, O. Millet, G. D Saxcé, ” Construction of an averaged stress tensor for a granular medium” European Journal of Mechanics, no 22,2003,pp 567–582.

[2] J.J Han, M. Dhanasekar, “Modelling cracks in arbitrarily shaped finite bodies by distribution of dislocation” International Journal of Solids and Structures, no 2004, pp 399–411.

[3] Frantisek, Stepanek, M. Soos, P. Rajniak, “Characterisation of porous media by the virtual capillary condensation method” Colloids and Surfaces A: Physicochem. Eng, 2006, pp 11-20

[4] A. Golpaygan, N. Ashgriz, “Effects of oxidant fluid properties on the mobility of water droplets in the channels of PEM fuel cell” International Journal of Energy Research, no 29, 2005,pp 1027-1040

[5] A. Ataki, H. J. Bart, “The Use of the VOF-model to study the wetting of solid surface” Chemical Engineering and Technology,no 27, 2004, pp. 1109-1114

國際替代計量

流體在喉口管內流動模擬

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