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Issue 37, 2013
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Momentum and mass transport over a bubble mattress: the influence of interface geometry

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Abstract

In this study we investigate numerically how a partially slippery bubble mattress can be employed to enhance momentum and mass transport. The bubble mattress, which is a superhydrophobic surface, consists of an array of slippery gas bubbles with no-slip walls in between. We consider a pressure-driven laminar flow over the bubble mattress, with a solute being supplied from the gas bubbles. The results show that, because of effective wall slip, solute transport can be enhanced significantly with respect to a fully saturated no-slip wall. The enhancement depends on the interface geometry of the bubble mattress, i.e. on the bubble size, protrusion angle, and surface porosity. In addition, we demonstrate that the mass transfer enhancement disappears below a critical bubble size. The effective slip vanishes for very small bubbles, wherefore interfacial transport becomes diffusion dominated. For large bubbles, solute transport near the interface is convection enhanced.

Graphical abstract: Momentum and mass transport over a bubble mattress: the influence of interface geometry

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Article information


Submitted
20 May 2013
Accepted
24 Jul 2013
First published
25 Jul 2013

Soft Matter, 2013,9, 8949-8957
Article type
Paper

Momentum and mass transport over a bubble mattress: the influence of interface geometry

A. S. Haase, E. Karatay, P. A. Tsai and R. G. H. Lammertink, Soft Matter, 2013, 9, 8949
DOI: 10.1039/C3SM51408K

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