通入氣泡對掃流微過濾中粒子附著與過濾通量之影響

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Title:	通入氣泡對掃流微過濾中粒子附著與過濾通量之影響
Other Titles:	Effects of air-sparging on particle deposition and filtration flux in cross-flow microfiltration
Authors:	黃國楨;Hwang, K .J.;吳効峰;Wu, S .F.
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	掃流微過濾;通氣;多相流;粒徑分佈;Cross-flow microfiltration;air-sparging;multiple phase flow;wide size distribution range
Date:	2008-09
Issue Date:	2012-12-03 22:06:17 (UTC+8)
Publisher:	臺北市：行政院國家科學委員會
Abstract:	本研究在掃流微過港、中通入氣體，探討液體速度、氣體流量以及過濾壓差等操作條件對過濾通量、粒子附著機率、濾餅性質以及濾面上剪切力的影響。隨著氣體流量的提昇會形成不同的流態，在氣i包流動的範圍內，作用於朕面上的剪切力能有效抑制品昌、餅生成，並且可以提高濯速，但隨著流態由氣泡流動轉變為團狀流，剪切力迅速增加的結果，會造成粒徑5μm 以上的粒子之附著大幅減少，在小粒子填補空隙後導致孔隙度下降，與流體對濾、餅壓縮的雙重作用下，使得過是、比阻出現明顯的增加，濾、速反而比未通氣時的數值低。配合力分析的結果可以發現，氣體對粒子造成的作用力在過濾中扮演桂重要的角色。本研究所提出基於力分析的粒子附著機構，可以用來預測濾餅中之粒徑分佈，粒子之附著機率與濾餅性質。The effects of liquid velocities, gas velocities and filtration pressures on the filtration flux, particle deposition probability, cake properties and shear stress on the membrane surface in air-sparging cross-flow microfiltration are studied. The flow pattern plays an important role on the filtration performance. The shear stress on the membrane surface can efficiently reduce the cake mass and enhance filtration rates under bubble flow; however, the specific filtration resistance of cake will markedly increase, which results in a lower filtration rate than non-sparging gas condition, under a slug flow. It is because the rapid increase in the shear stress on the membrane surface leads the stability of larger particles to decrease in a slug flow and also leads more small particles to pack in the void in cake. The cake layer is compressed more seriously due to the gas-flow, this make the specific filtration resistance of cake to be significantly increased. According to the force analysis, the probability of particle deposition on the membrane surface can be understood. Therefore, the cake mass, the particle size distribution in cake can be also estimated.
Relation:	2008年輸送現象及其應用研討會論文摘要集 ( 2008 Symposium of transport phenomena and applications abstract book)
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Proceeding

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