Lattice Boltzmann simulations of multiphase dielectric fluids

Ruiz‑Gutiérrez, É., Edwards, A. ORCID: 0000-0003-3338-1287, McHale, G., Newton, M. ORCID: 0000-0003-4231-1002, Wells, G., Brown, C. ORCID: 0000-0002-1559-3238 and Ledesma‑Aguilar, R., 2021. Lattice Boltzmann simulations of multiphase dielectric fluids. Langmuir. ISSN 0743-7463 (Forthcoming)

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Abstract

The dynamic effect of an electric field on dielectric liquids is called liquid dielectrophoresis. It is widely used in several industrial and scientific applications, including inkjet printing, micro-fabrication and optical devices. Numerical simulations of liquid-dielectrophoresis are necessary to understand the fundamental physics of the phenomenon, but also to explore situations that might be difficult or expensive to implement experimentally. However, such modelling is challenging, as one needs to solve the electrostatic and fluid dynamics equations simultaneously. Here, we formulate a new lattice-Boltzmann method capable of modelling the dynamics of immiscible dielectric fluids coupled with electric fields within a single framework, thus eliminating the need of using separate algorithms to solve the electrostatic and fluid dynamics equations. We validate the numerical method by comparing it with analytical solutions and previously reported experimental results. Beyond the benchmarking of the method, we study the spreading of a droplet using a dielectrowetting setup and quantify the mechanism driving the variation of the apparent contact angle of the droplet with the applied voltage. Our method provides a useful tool to study liquid-dielectrophoresis and can be used to model dielectric fluids in general, such as liquid-liquid and liquid-gas systems.

Item Type: Journal article
Publication Title: Langmuir
Creators: Ruiz‑Gutiérrez, É., Edwards, A., McHale, G., Newton, M., Wells, G., Brown, C. and Ledesma‑Aguilar, R.
Publisher: American Chemical Society
Date: 19 May 2021
ISSN: 0743-7463
Identifiers:
NumberType
1440307Other
Divisions: Schools > School of Science and Technology
Record created by: Laura Ward
Date Added: 21 May 2021 09:05
Last Modified: 02 Jun 2021 12:18
URI: http://irep.ntu.ac.uk/id/eprint/42900

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