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Numerical simulations of sessile droplet evaporating on heated substrate

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Abstract

Motivated by the space project EFILE, a 2D axisymmetric numerical model in the framework of ALE method is developed to investigate the coupled physical mechanism during the evaporation of a pinned drop that partially wets on a heated substrate. The model accounts for mass transport in surrounding air, Marangoni convection inside the drop and heat conduction in the substrate as well as moving interface. Numerical results predict simple scaling laws for the evaporation rate which scales linearly with drop radius but follows a power-law with substrate temperature. It is highlighted that thermal effect of the substrate has a great impact on the temperature profile at the drop surface, which leads to a multicellular thermocapillary flow pattern. In particular, the structure of the multicellular flow behavior induced within a heated drop is mainly controlled by a geometric parameter (aspect ratio). A relationship between the number of thermal cells and the aspect ratio is proposed.

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Correspondence to Paul G. Chen.

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Chen, X., Chen, P.G., Ouazzani, J. et al. Numerical simulations of sessile droplet evaporating on heated substrate. Eur. Phys. J. Spec. Top. 226, 1325–1335 (2017). https://doi.org/10.1140/epjst/e2016-60203-y

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  • DOI: https://doi.org/10.1140/epjst/e2016-60203-y

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