Impact of internal flow and particle-substrate interaction on deposit patterns during evaporation of a colloidal sessile droplet

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Mokhtari, A., Saada, M. Ait, Chikh, S. and Tadrist, L. (2025) Impact of internal flow and particle-substrate interaction on deposit patterns during evaporation of a colloidal sessile droplet.

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Abstract

Our numerical study aims to investigate particle deposit patterns from the evaporation of a sessile colloidal droplet. An in house finite volume code is developed to simulate the coupled phenomena of flow and heat and mass transfer with phase change of the evaporating droplet. The numerical model takes into account evaporative cooling effect, surface tension gradient effect at the liquid-air interface, thermal buoyancy effect inside the droplet, thermosolutal buoyancy effect in the surrounding air and electrical double layer and Van der Waals interactions between substrate and colloidal particles. Three models are used in this study: (a) a model that takes into account only the strong evaporation near the pinned contact line (b) a model that takes into account in addition the thermo capillary effect and (c) a comprehensive model that takes into account all effects. The results show that without heating the thermal buoyancy has a negligible effect on the formation of particle deposit. In presence of substrate-particle interactions, dominant radial flow is the main responsible for the coffee ring effect giving a ring-like pattern with inner traces, while the Marangoni flow reduces the coffee ring effect giving a uniform deposit with a dark periphery

Item Type:	Article
Uncontrolled Keywords:	physics.flu-dyn
Faculty \ School:	Faculty of Science Faculty of Science > School of Engineering, Mathematics and Physics
UEA Research Groups:	Faculty of Science > Research Groups > Sustainable Energy
Related URLs:	http://arxiv.org/pdf/2507.02091v1
Depositing User:	LivePure Connector
Date Deposited:	11 Jul 2025 08:30
Last Modified:	11 Jul 2025 08:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/99883
DOI:	10.48550/arXiv.2507.02091

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