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Modeling porous shell formation in bidisperse suspension droplet drying.

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Bibliographic Details
Title:	Modeling porous shell formation in bidisperse suspension droplet drying.
Authors:	Krasovitov, Boris¹ (AUTHOR), Fominykh, Andrew¹ (AUTHOR), Wolf, Silas² (AUTHOR), Schilde, Carsten² (AUTHOR), Levy, Avi¹ (AUTHOR) avi@bgu.ac.il
Source:	Drying Technology. 2026, Vol. 44 Issue 9, p1303-1315. 13p.
Subjects:	Colloidal suspensions, Mass transfer, Colloids, Brownian motion, Capillarity
Abstract:	In this study, the self-organization of colloidal particles during drying of a bimodal suspension droplet over a constant evaporation rate was investigated using the continuous species transport model. The model considers the transport of particles of two sizes due to capillary-driven liquid flow through the porous medium, Brownian diffusion, and diffusiophoresis induced by the osmotic pressure gradient of small particles. It is shown that diffusiophoresis of large particles is an interconnected transport mechanism thermodynamically coupled to the flows of small particles and liquid. Comparison with the available experimental data showed good agreement: the model adequately reproduces the formation of a porous aggregate. At high evaporation rates ( ψ = 6.0 µm2/ms, d L / d s = 3 : 1), Brownian diffusion and capillary-driven hydrodynamic flow dominate, which leads to the accumulation of particles at the surface without pronounced radial stratification. At a lower speed ( ψ = 0.237 µm2/ms, d L / d s = 10 : 1) diffusiophoresis occurs, and clear stratification is observed: small particles at the surface, large ones in the center. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	In this study, the self-organization of colloidal particles during drying of a bimodal suspension droplet over a constant evaporation rate was investigated using the continuous species transport model. The model considers the transport of particles of two sizes due to capillary-driven liquid flow through the porous medium, Brownian diffusion, and diffusiophoresis induced by the osmotic pressure gradient of small particles. It is shown that diffusiophoresis of large particles is an interconnected transport mechanism thermodynamically coupled to the flows of small particles and liquid. Comparison with the available experimental data showed good agreement: the model adequately reproduces the formation of a porous aggregate. At high evaporation rates ( ψ = 6.0 µm2/ms, d L / d s = 3 : 1), Brownian diffusion and capillary-driven hydrodynamic flow dominate, which leads to the accumulation of particles at the surface without pronounced radial stratification. At a lower speed ( ψ = 0.237 µm2/ms, d L / d s = 10 : 1) diffusiophoresis occurs, and clear stratification is observed: small particles at the surface, large ones in the center. [ABSTRACT FROM AUTHOR]
ISSN:	07373937
DOI:	10.1080/07373937.2025.2608928