Liquid flow through aqueous foams: The node-dominated foam drainage equation

Stephan A. Koehler, Sascha Hilgenfeldt, Howard A. Stone

Research output: Contribution to journalArticlepeer-review

198 Scopus citations


We present an experimental study of forced drainage through a soap foam, where a constant liquid flux at the top of a dry foam produces a downwards traveling wave with a constant velocity and uniform liquid content. The results are not consistent with existing models and we propose a new model, based upon relaxing the condition of wall rigidity throughout the network and emphasizing the importance of viscous damping in the nodes where Plateau borders meet. This model agrees well with the experimentally measured (power-law) scaling behavior of the drainage velocity, and the width of the propagating liquid front, on the imposed flow rate and bubble size.

Original languageEnglish (US)
Pages (from-to)4232-4235
Number of pages4
JournalPhysical review letters
Issue number21
StatePublished - 1999

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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