Hutzler S, Verbist G, Weaire D and Van der Steen J A, ‘Measurement of Foam Density Profiles Using AC Capacitance’ in Europhysics Letters, 31, (8), 1995, pp 497 - 502
Europhysics Letters 31 8
The dynamics of foam drainage (free, forced and pulsed) is monitored by the determination of local liquid density using a vertical array of capacitors. Liquid profiles are obtained for various drainage experiments. The merging of two solitary waves is in good agreement with theoretical predictions. Such capacitance measurements offer a convenient practical technique for characterising the more general properties of non-conducting foams.
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