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Volume 33, Issue 1
Dynamical Demixing of a Binary Mixture Under Sedimentation

André S. Nunes, Rodrigo C. V. Coelho, Vasco C. Braz, Margarida M. Telo da Gama & Nuno A. M. Araújo

DOI: 10.4208/cicp.OA-2021-0244

Commun. Comput. Phys., 33 (2023), pp. 1-21.

Published online: 2023-02

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  • Abstract

We investigate the sedimentation dynamics of a binary mixture, the species of which differ by their Stokes coefficients but are identical otherwise. We analyze the sedimentation dynamics and the morphology of the final deposits using Brownian dynamics simulations for mixtures with a range of sedimentation velocities of both species. In addition, we use the lattice Boltzmann method to study hydrodynamic effects. We found a threshold in the difference of the sedimentation velocities above which the species in the final deposit are segregated. The degree of segregation increases with the difference in the Stokes coefficients or the sedimentation velocities above the threshold. We propose a simple analytical model that captures the main features of the simulated deposits.

  • Keywords

Sedimentation, Brownian dynamics, lattice Boltzmann method.

  • AMS Subject Headings

82-08, 76Dxx, 76Txx

  • Copyright

COPYRIGHT: © Global Science Press

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  • TXT
@Article{CiCP-33-1, author = {Nunes , André S.Coelho , Rodrigo C. V.Braz , Vasco C.Gama , Margarida M. Telo da and Araújo , Nuno A. M.}, title = {Dynamical Demixing of a Binary Mixture Under Sedimentation}, journal = {Communications in Computational Physics}, year = {2023}, volume = {33}, number = {1}, pages = {1--21}, abstract = {

We investigate the sedimentation dynamics of a binary mixture, the species of which differ by their Stokes coefficients but are identical otherwise. We analyze the sedimentation dynamics and the morphology of the final deposits using Brownian dynamics simulations for mixtures with a range of sedimentation velocities of both species. In addition, we use the lattice Boltzmann method to study hydrodynamic effects. We found a threshold in the difference of the sedimentation velocities above which the species in the final deposit are segregated. The degree of segregation increases with the difference in the Stokes coefficients or the sedimentation velocities above the threshold. We propose a simple analytical model that captures the main features of the simulated deposits.

}, issn = {1991-7120}, doi = {https://doi.org/10.4208/cicp.OA-2021-0244}, url = {http://global-sci.org/intro/article_detail/cicp/21422.html} }
TY - JOUR T1 - Dynamical Demixing of a Binary Mixture Under Sedimentation AU - Nunes , André S. AU - Coelho , Rodrigo C. V. AU - Braz , Vasco C. AU - Gama , Margarida M. Telo da AU - Araújo , Nuno A. M. JO - Communications in Computational Physics VL - 1 SP - 1 EP - 21 PY - 2023 DA - 2023/02 SN - 33 DO - http://doi.org/10.4208/cicp.OA-2021-0244 UR - https://global-sci.org/intro/article_detail/cicp/21422.html KW - Sedimentation, Brownian dynamics, lattice Boltzmann method. AB -

We investigate the sedimentation dynamics of a binary mixture, the species of which differ by their Stokes coefficients but are identical otherwise. We analyze the sedimentation dynamics and the morphology of the final deposits using Brownian dynamics simulations for mixtures with a range of sedimentation velocities of both species. In addition, we use the lattice Boltzmann method to study hydrodynamic effects. We found a threshold in the difference of the sedimentation velocities above which the species in the final deposit are segregated. The degree of segregation increases with the difference in the Stokes coefficients or the sedimentation velocities above the threshold. We propose a simple analytical model that captures the main features of the simulated deposits.

André S. Nunes, Rodrigo C. V. Coelho, Vasco C. Braz, Margarida M. Telo da Gama & Nuno A. M. Araújo. (2023). Dynamical Demixing of a Binary Mixture Under Sedimentation. Communications in Computational Physics. 33 (1). 1-21. doi:10.4208/cicp.OA-2021-0244
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