Bubble kinematics in a sheared foam

TL;DR

This study analyzes bubble movement in a sheared 2D foam using statistical methods, comparing experimental results with simulations to identify both consistencies and discrepancies in velocity distributions.

Contribution

It provides a detailed statistical characterization of bubble kinematics in sheared foam and highlights differences from existing models.

Findings

Experimental and simulation velocity distributions largely agree.

Notable differences in velocity distribution reveal limitations of current models.

Results enhance understanding of foam rheology under shear.

Abstract

We characterize the kinematics of bubbles in a sheared two-dimensional foam using statistical measures. We consider the distributions of both bubble velocities and displacements. The results are discussed in the context of the expected behavior for a thermal system and simulations of the bubble model. There is general agreement between the experiments and the simulation, but notable differences in the velocity distributions point to interesting elements of the sheared foam not captured by prevalent models.