Compression-thinning behavior of bubble suspensions
Abstract
Rheology of bubble suspensions is critical for the prediction and control of bubbly flows in a wide range of industrial processes. It is well-known that the bubble suspension exhibits a shear-thinning behavior due to the bubble shape deformation under pure shear, but how the shear rheology response to dilatation remains unexplored. Here, we report a compression-thinning behavior that the bubble suspension exhibits a decreasing shear viscosity upon compressing. This peculiar rheological behavior is microscopically due to that a shrinking bubble surface effectively weakens the flow resistance of the surrounding liquid. We theoretically propose a constitutive equation for dilute bubble suspensions considering both shear and dilatation effects, and demonstrate that the contribution of dilatation effect on the shear viscosity can be significant at a changing pressure.
Cite
@article{arxiv.2412.01327,
title = {Compression-thinning behavior of bubble suspensions},
author = {Hu Sun and Qingfei Fu and Chiyu Xie and Bingqiang Ji and Lijun Yang},
journal= {arXiv preprint arXiv:2412.01327},
year = {2024}
}