Foam drainage equation in fractal dimensions: breaking and instabilities

Eur Phys J E Soft Matter. 2023 Nov 13;46(11):110. doi: 10.1140/epje/s10189-023-00368-6.

Abstract

This paper is concerned with the construction of a phenomenological model for drainage of a liquid in foam in fractal dimensions. Our model is based on the concepts of "product-like fractal measure" introduced to model dynamics in porous media and "complex fractional transform" which converts a fractal space on a small scale to a smooth space with a large scale. The solution of the fractal foam drainage equation has been approximated using the He's homotopy perturbation method. Qualitative analysis shows that the behavior of the solitonic wave in fractal dimensions differ from the behavior in integer dimensions. This deformation generates instabilities in the foam dynamics, dispersion and spontaneous breaking of the solitonic wave.