Global geometry and the equilibrium shapes of liquid drops on fibers

MCHALE, G. and NEWTON, M.I., 2002. Global geometry and the equilibrium shapes of liquid drops on fibers. Colloids and Surfaces A - Physicochemical and Engineering Aspects, 206 (13), pp. 79-86. ISSN 0927-7757

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Abstract

The wetting of a planar surface depends upon both the chemical nature of the surface and the local geometry. On a chemically identical solid surface in the form of a fiber the wetting is significantly different due to the global geometry of the cylindrical shape. A fluid that fully wets a material in the form of a smooth planar surface may not wet the same material when presented as a smooth fiber surface. On a fiber, a vanishing contact angle is not a sufficient condition for the formation of a wetting film; a macroscopic barrel shaped droplet with a vanishing equilibrium contact angle can exist. Moreover, two distinctly different geometric shapes of droplet are possible: a barrel and a clam-shell. In this work, these two shapes are considered using an analytical result for the barrel shape and a finite element calculation for the clam-shell shape. The surface free energies for these two conformations are evaluated for contact angles between 14 and 70° and for a wide range of droplet volumes.

Item Type: Journal article
Publication Title: Colloids and Surfaces A - Physicochemical and Engineering Aspects
Creators: McHale, G. and Newton, M.I.
Publisher: Elsevier Science
Place of Publication: Amsterdam
Date: 2002
Volume: 206
Number: 13
ISSN: 0927-7757
Identifiers:
NumberType
10.1016/S0927-7757(02)00081-XDOI
Rights: © 2002 Elsevier Science B.V. All rights reserved.
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 10:15
Last Modified: 23 Aug 2016 09:09
URI: http://irep.ntu.ac.uk/id/eprint/10038

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