A Survey of the Laws of Foam Formation and Its Applications in Separation Processes

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Abstract
This study summarizes various laws of foam formation, foam rheology, and foam drainage. It also discusses different forces—Laplace capillary suction, van der Waals interaction, electric double layer, and steric factor—acting in drainage of foams. In addition, recent work on phase equilibria and foam stability and the use of foam in fractionation and extraction processes is reviewed. Finally, it presents the possibility of using foam in gas cleaning and a theoretical model for gas cleaning by foam.

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