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Issue 47, 2017
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Using evaporation to control capillary instabilities in micro-systems

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Abstract

The instabilities of fluid interfaces represent both a limitation and an opportunity for the fabrication of small-scale devices. Just as non-uniform capillary pressures can destroy micro-electrical mechanical systems (MEMS), so they can guide the assembly of novel solid and fluid structures. In many such applications the interface appears during an evaporation process and is therefore only present temporarily. It is commonly assumed that this evaporation simply guides the interface through a sequence of equilibrium configurations, and that the rate of evaporation only sets the timescale of this sequence. Here, we use Lattice-Boltzmann simulations and a theoretical analysis to show that, in fact, the rate of evaporation can be a factor in determining the onset and form of dynamical capillary instabilities. Our results shed light on the role of evaporation in previous experiments, and open the possibility of exploiting diffusive mass transfer to directly control capillary flows in MEMS applications.

Graphical abstract: Using evaporation to control capillary instabilities in micro-systems

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Publication details

The article was received on 18 Jul 2017, accepted on 06 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7SM01426K
Citation: Soft Matter, 2017,13, 8947-8956
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    Using evaporation to control capillary instabilities in micro-systems

    R. Ledesma-Aguilar, G. Laghezza, J. M. Yeomans and D. Vella, Soft Matter, 2017, 13, 8947
    DOI: 10.1039/C7SM01426K

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