Rayleigh-Taylor Instability in Viscoelastic Fluids
Abstract
In this paper I analyze the onset of Rayleigh-Taylor instability between two linear viscoelastic fluids assuming that the perturbations at the interface are small. In the first half, the paper analyzes a stratified viscoelastic fluid in which I prove that the perturbations rise or fall exponentially without oscillating. The second half of the paper examines the effect of electric and magnetic fields on viscoelastic fluids. I show that it is possible to choose electric or magnetic field gradient such that the effective acceleration due to gravity is zero. If a heavy Newtonian fluid rests on top of a lighter Newtonian fluid such a choice of field gradient would have rendered the arrangement stable. If the fluids are viscoelastic, I show that a similar arrangement is unstable.
Cite
@article{arxiv.1308.0706,
title = {Rayleigh-Taylor Instability in Viscoelastic Fluids},
author = {Amey Joshi},
journal= {arXiv preprint arXiv:1308.0706},
year = {2013}
}