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Analytical prediction for the steady-state behavior of a confined drop with interface viscosity under shear flow

F. Guglietta1,* and F. Pelusi2

  • *Contact author: fabio.guglietta@roma2.infn.it
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Phys. Rev. Fluids 9, 103603 – Published 30 October, 2024

DOI: https://doi.org/10.1103/PhysRevFluids.9.103603

Abstract

The steady-state behavior of a single drop under shear flow has been extensively investigated in the limit of small deformation and negligible inertia effects. In this work, we combine the calculations proposed by Flumerfelt [R. W. Flumerfelt, J. Colloid Interface Sci. 76, 330 (1980)] for unconfined drops with interface viscosity, with those by Shapira and Haber [M. Shapira and S. Haber, Int. J. Multiphase Flow 16, 305 (1990)] for confined drops without interface viscosity. By merging these two approaches, we provide comprehensive analytical predictions for steady-state drop deformation and inclination angle across a wide range of physical conditions, from confined to unconfined droplets, including or excluding the effect of interface viscosity. The proposed analytical predictions are also robust concerning variations in the viscosity ratio, making our model general enough to include any of the above conditions.

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Phys. Rev. Fluids 9, 103603– Published 30 October, 2024
  • Received 24 April 2024
  • Accepted 27 September 2024
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