Hydrodynamic simulations of sedimenting dilute particle suspensions under repulsive DLVO interactions

Jung D, Uttinger M, Malgaretti P, Peukert W, Walter J, Harting J (2022)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2022

Journal

Soft Matter Royal Society of Chemistry

Publisher: ROYAL SOC CHEMISTRY

Book Volume: 18

Pages Range: 2157-2167

Journal Issue: 11

DOI: 10.1039/d1sm01294k

Abstract

We present guidelines to estimate the effect of electrostatic repulsion in sedimenting dilute particle suspensions. Our results are based on combined Langevin dynamics and lattice Boltzmann simulations for a range of particle radii, Debye lengths and particle concentrations. They show a simple relationship between the slope K of the concentration-dependent sedimentation velocity and the range chi of the electrostatic repulsion normalized by the average particle-particle distance. When chi -> 0, the particles are too far away from each other to interact electrostatically and K = 6.55 as predicted by the theory of Batchelor. As chi increases, K likewise increases as if the particle radius increased in proportion to chi up to a maximum around chi = 0.4. Over the range chi = 0.4-1, K relaxes exponentially to a concentration-dependent constant consistent with known results for ordered particle distributions. Meanwhile the radial distribution function transitions from a disordered gas-like to a liquid-like form. Power law fits to the concentration-dependent sedimentation velocity similarly yield a simple master curve for the exponent as a function of chi, with a step-like transition from 1 to 1/3 centered around chi = 0.6.

Authors with CRIS profile

Maximilian Uttinger Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Wolfgang Peukert Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Johannes Walter Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Jung, D., Uttinger, M., Malgaretti, P., Peukert, W., Walter, J., & Harting, J. (2022). Hydrodynamic simulations of sedimenting dilute particle suspensions under repulsive DLVO interactions. Soft Matter, 18(11), 2157-2167. https://dx.doi.org/10.1039/d1sm01294k

MLA:

Jung, David, et al. "Hydrodynamic simulations of sedimenting dilute particle suspensions under repulsive DLVO interactions." Soft Matter 18.11 (2022): 2157-2167.

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