Influence of surface tension on two fluids shearing instability

  • Rahul Banerjee St. Paul's Cathedral Mission College. Kolkata-700009, India
  • S. Kanjilal St. Paul's Cathedral Mission College. Kolkata-700009, India
Keywords: Shear flow, Gravitational force, Surface tension, Rayleigh-Taylor instability, Kelvin- Helmholtz instability, Bubbles, Spikes


Using extended Layzer's potential flow model, we investigate the effects of surface tension on the growth of the bubble and spike in combined Rayleigh-Taylor and Kelvin-Helmholtz instability. The nonlinear asymptotic solutions are obtained analytically for the velocity and curvature of the bubble and spike tip. We find that the surface tension decreases the velocity but does not affect the curvature, provided surface tension is greater than a critical value. For a certain condition, we observe that surface tension stabilizes the motion. Any perturbation, whatever its magnitude, results stable with nonlinear oscillations. The nonlinear oscillations depend on surface tension and relative velocity shear of the two fluids.


Received: 20 March 2014,  Accepted: 7 August 2014; Edited by: A. Marti; DOI:

Cite as: R Banerjee, S Kanjilal, Papers in Physics 6, 060006 (2014)