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Dynamics of deformation and pinch-off of a migrating compound droplet in a tube

Manash Pratim Borthakur1, Gautam Biswas1,*, and Dipankar Bandyopadhyay2

  • 1Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
  • 2Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India

  • *gtm@iitg.ernet.in
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Phys. Rev. E 97, 043112 – Published 19 April, 2018

DOI: https://doi.org/10.1103/PhysRevE.97.043112

Abstract

A computational fluid dynamic investigation has been carried out to study the dynamics of a moving compound droplet inside a tube. The motions associated with such a droplet is uncovered by solving the axisymmetric Navier-Stokes equations in which the spatiotemporal evolution of a pair of twin-deformable interfaces has been tracked employing the volume-of-fluid approach. The deformations at the interfaces and their subsequent dynamics are found to be stimulated by the subtle interplay between the capillary and viscous forces. The simulations uncover that when a compound drop composed of concentric inner and outer interfaces migrates inside a tube, initially in the unsteady domain of evolution, the inner drop shifts away from the concentric position to reach a morphology of constant eccentricity at the steady state. The coupled motions of the droplets in the unsteady regime causes a continuous deformation of the inner and outer interfaces to obtain a configuration with a (an) prolate (oblate) shaped outer (inner) interface. The magnitudes of capillary number and viscosity ratio are found to have significant influence on the temporal evolution of the interfacial deformations as well as the eccentricity of the droplets. Further, the simulations uncover that, following the asymmetric deformation of the interfaces, the migrating compound droplet can undergo an uncommon breakup stimulated by a rather irregular pinch-off of the outer shell. The breakup is found to initiate with the thinning of the outer shell followed by the pinch-off. Interestingly, the kinetics of the thinning of outer shell is found to follow two distinct power-law regimes—a swiftly thinning stage at the onset followed by a rate limiting stage before pinch-off, which eventually leads to the uncommon breakup of the migrating compound droplets.

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Outline

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Phys. Rev. E 97, 043112– Published 19 April, 2018
  • Received 19 November 2017
  • Revised 7 March 2018
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