Chapter

Foams and Emulsions

Volume 354 of the series NATO ASI Series pp 237-258

Surfactants and Stress Conditions at Fluid Interfaces

  • Kathleen J. StebeAffiliated withThe Johns Hopkins University
  • , Charles D. EggletonAffiliated withThe Johns Hopkins University

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Abstract

Surfactants are amphiphilic molecules that adsorb on fluid interfaces, where they reduce the surface tension. If the interface is moving, surface convection can distribute surfactant non-uniformly, creating surface tension gradients or Marangoni stresses. These two phenomena are the keys to understanding the stress response of surfactant-laden interfaces in multiphase flows.