Contact angle effects on microdroplet deformation using CFD

Rosengarten, G, Harvie, D and Cooper-White, J 2006, 'Contact angle effects on microdroplet deformation using CFD', Applied Mathematical Modelling, vol. 30, pp. 1033-1042.


Document type: Journal Article
Collection: Journal Articles

Title Contact angle effects on microdroplet deformation using CFD
Author(s) Rosengarten, G
Harvie, D
Cooper-White, J
Year 2006
Journal name Applied Mathematical Modelling
Volume number 30
Start page 1033
End page 1042
Total pages 10
Publisher Elsevier Science
Abstract In this paper we use computational fluid dynamics (CFD) to study the effect of contact angle on droplet shape as it moves through a contraction. A new non-dimensional number is proposed in order to predict situations where the deformed droplet will form a slug in the contraction and thus have the opportunity to interact with the channel wall. It is proposed that droplet flow into a contraction is a useful method to ensure that a droplet will wet a channel surface without a trapped lubrication film, and thus help ensure that a slug will remain attached to the wall downstream of the contraction. We demonstrate that when a droplet is larger than a contraction, capillary and Reynolds numbers, and fluid properties may not be sufficient to fully describe the droplet dynamics through a contraction. We show that, with everything else constant, droplet shape and breakup can be controlled simply by changing the wetting properties of the channel wall. CFD simulations with contact angles ranging from 30 degrees to 150 degrees show that lower contact angles can induce droplet breakup while higher contact angles can form slugs with contact angle dependent shape.
Subject Fluidisation and Fluid Mechanics
Keyword(s) Solid-Surface
Shear-Flow
Drop
Dynamics
Detachment
Bubbles
Motion
Tube
DOI - identifier 10.1016/j.apm.2005.06.011
Copyright notice Crown copyright © 2005 Published by Elsevier Inc.
ISSN 0307-904X
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