Hostname: page-component-89b8bd64d-mmrw7 Total loading time: 0 Render date: 2026-05-07T01:53:58.376Z Has data issue: false hasContentIssue false

Dynamic stabilisation of Rayleigh–Plateau modes on a liquid cylinder

Published online by Cambridge University Press:  02 August 2022

Sagar Patankar
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology, Bombay, Powai 400076, India
Saswata Basak
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology, Bombay, Powai 400076, India
Ratul Dasgupta*
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology, Bombay, Powai 400076, India
*
Email address for correspondence: dasgupta.ratul@iitb.ac.in

Abstract

We demonstrate dynamic stabilisation of axisymmetric Fourier modes susceptible to the classical Rayleigh–Plateau (RP) instability on a liquid cylinder by subjecting it to a radial oscillatory body force. Viscosity is found to play a crucial role in this stabilisation. Linear stability predictions are obtained via Floquet analysis demonstrating that RP unstable modes can be stabilised using radial forcing. We also solve the linearised, viscous initial-value problem for free-surface deformation obtaining an equation governing the amplitude of a three-dimensional Fourier mode. This equation generalizes the Mathieu equation governing Faraday waves on a cylinder derived earlier in Patankar et al. (J. Fluid Mech., vol. 857, 2018, pp. 80–110), is non-local in time and represents the cylindrical analogue of its Cartesian counterpart (Beyer & Friedrich, Phys. Rev. E, vol. 51, issue 2, 1995, p. 1162). The memory term in this equation is physically interpreted and it is shown that, for highly viscous fluids, its contribution can be sizeable. Predictions from the numerical solution to this equation demonstrate the predicted RP mode stabilisation and are in excellent agreement with simulations of the incompressible Navier–Stokes equations (up to the simulation time of several hundred forcing cycles).

Information

Type
JFM Papers
Copyright
© The Author(s), 2022. Published by Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

Supplementary material: File

Patankar et al. supplementary material

Patankar et al. supplementary material

Download Patankar et al. supplementary material(File)
File 6.5 MB