THE EVOLUTION OF LIQUID FOAMS

The problem of the evolution of a liquid foam is studied by regarding the surfaces separating the cells of the foam as 'particles' which hav e interactions with other such particles according to the well known l aws of foam dynamics, i.e. the T1 and T2 processes. This point of view naturally leads to transport equations and the familiar territory of the Boltzmann, Fokker-Planck and Smoluchowski equations. Certain well known results appear very simply from this approach such as Von Neuman n's law, but new results appear in that formalism gives transport coef ficients in particular shear viscosity.