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Laminar flow deformation of a droplet adhering to a wall in a channel

Authors
Journal
Chemical Engineering Science
0009-2509
Publisher
Elsevier
Publication Date
Volume
65
Issue
16
Identifiers
DOI: 10.1016/j.ces.2010.04.012
Keywords
  • Laminar Flow
  • Droplet Deformation
  • Flow Visualisation
  • Numerical Simulations
  • Diffuse-Interface Method
  • Moving Contact Lines

Abstract

Abstract We study the deformation of oil droplets of varying viscosity adhering to a solid, rigid wall in a rectangular channel induced by a pressure-driven, laminar flow of water. Our experimental investigation involves the systematic study of the effects of initial droplet volume, flow rate and viscosity ratio on the various modes of droplet motion and deformation; this is performed via direct visualisation of the flow in a glass cell using a high-speed camera. Our results are used to construct flow maps that delineate the critical conditions for droplet ‘sliding’, ‘crawling’ and detachment from the channel wall as a function of system parameters. Comparisons of our experimental results with numerical predictions obtained using a procedure based on the diffuse-interface method yield reasonably good agreement for certain flow regimes.

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