The Wetness of a Rising Foam

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• 作者：Paul Stevenson
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：January 18, 2006
• 年：2006
• 卷：45
• 期：2
• 页码：803 - 807
• 全文大小：85K
• 年卷期：v.45,no.2(January 18, 2006)
• ISSN：1520-5045

文摘

A simple graphical method of calculating the liquid volume fraction, or wetness, of a rising pneumatic foamis presented that is deterministic, given system properties (such as the bubble size distribution and the rate atwhich gas is sparged to the column) and the kinematic viscosity of the interstitial fluid along with someinformation about the drainage behavior of the stationary foam analogue. Thus, it is shown that data for thewetness of rising columns of SDS foam (Stevenson, P.; Stevanov, C. Ind. Eng. Chem. Res. 2004, 43, 6187)can be well-predicted using an equation (Neethling, S. J.; Lee, H. T.; Cilliers, J. J. J. Phys.: CondensedMatter 2002, 14, 331) for the drainage of liquid through stationary columns of SDS foam. Further, the liquidoverflow rate can be well-predicted once the liquid volume fraction is calculated. The effects of washwateradded to the top of the column and bubble bursting on the equilibrium volumetric fraction have been consideredtheoretically. It is shown that the volumetric liquid fraction of the foam will be enhanced and the enhancementcan be determined graphically. However, the rate at which liquid will be recovered from the top of the columnis seen to be independent of washwater addition and bubble bursting.