Particle deposit patterns from evaporation of a sessile colloidal droplet

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Mokhtari, A., AitSaada, M., Chikh, S. and Tadrist, L. (2025) Particle deposit patterns from evaporation of a sessile colloidal droplet.

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Abstract

The present work investigates numerically the transport of colloidal particles within an evaporating sessile droplet and their deposition on the substrate in unfavourable conditions. The coupled phenomena of fluid flow and heat and mass transfer with phase change are modelled by taking into account for the evaporative cooling effect, the surface tension gradient effect at liquid air interface and the particles-substrate interaction effect due to DLVO attractive forces.The results show that in presence of the particles-substrate interaction, the outward radial internal flow is the main responsible for the coffee ring effect giving rise a ring like pattern with inner traces, while the thermal Marangoni internal flow reduces this effect giving rise a uniform deposit with a dark periphery.

Item Type:	Article
Additional Information:	conference
Uncontrolled Keywords:	physics.flu-dyn,cond-mat.mes-hall
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/2507.02075v1
Depositing User:	LivePure Connector
Date Deposited:	11 Jul 2025 15:30
Last Modified:	11 Jul 2025 15:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/99893
DOI:	10.48550/arXiv.2507.02075

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