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10.3390/ma15030855
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Article

The Migration and Deposition Behaviors of Montmorillonite and Kaolinite Particles in a Two-Dimensional Micromodel

by
Bate Bate
,
Chao Chen
,
Pengfei Liu
,
Chen Zhou
,
Xiao Chen
,
Shaokai Nie
,
Kexin Chen
*,
Yunmin Chen
and
Shuai Zhang
*
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Institute of Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
*
Authors to whom correspondence should be addressed.
Materials 2022, 15(3), 855; https://doi.org/10.3390/ma15030855
Submission received: 14 October 2021 / Revised: 2 December 2021 / Accepted: 3 December 2021 / Published: 23 January 2022
(This article belongs to the Special Issue Recent Advances in Soil as an Engineering Material)
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Abstract

The pick-up, migration, deposition, and clogging behaviors of fine particles are ubiquitous in many engineering applications, including contaminant remediation. Deposition and clogging are detrimental to the efficiency of environmental remediation, and their mechanisms are yet to be elucidated. Two-dimensional microfluidic models were developed to simulate the pore structure of porous media with unified particle sizes in this study. Kaolin and bentonite suspensions were introduced to microfluidic chips to observe their particle deposition and clogging behaviors. Interactions between interparticle forces and particle velocity profiles were investigated via computational fluid dynamics and discrete element method simulations. The results showed that (1) only the velocity vector toward the micropillars and drag forces in the reverse direction were prone to deposition; (2) due to the negligible weight of particles, the Stokes number implied that inertia was not the controlling factor causing deposition; and (3) the salinity of the carrying fluid increased the bentonite deposition because of the shrinkage of the diffused electrical double layer and an increase in aggregation force, whereas it had little effect on kaolin deposition.
Keywords: microfluidic model; bentonite aggregates; kaolinite aggregates; clogging; spatial distribution; salinity microfluidic model; bentonite aggregates; kaolinite aggregates; clogging; spatial distribution; salinity

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MDPI and ACS Style

Bate, B.; Chen, C.; Liu, P.; Zhou, C.; Chen, X.; Nie, S.; Chen, K.; Chen, Y.; Zhang, S. The Migration and Deposition Behaviors of Montmorillonite and Kaolinite Particles in a Two-Dimensional Micromodel. Materials 2022, 15, 855. https://doi.org/10.3390/ma15030855

AMA Style

Bate B, Chen C, Liu P, Zhou C, Chen X, Nie S, Chen K, Chen Y, Zhang S. The Migration and Deposition Behaviors of Montmorillonite and Kaolinite Particles in a Two-Dimensional Micromodel. Materials. 2022; 15(3):855. https://doi.org/10.3390/ma15030855

Chicago/Turabian Style

Bate, Bate, Chao Chen, Pengfei Liu, Chen Zhou, Xiao Chen, Shaokai Nie, Kexin Chen, Yunmin Chen, and Shuai Zhang. 2022. "The Migration and Deposition Behaviors of Montmorillonite and Kaolinite Particles in a Two-Dimensional Micromodel" Materials 15, no. 3: 855. https://doi.org/10.3390/ma15030855

APA Style

Bate, B., Chen, C., Liu, P., Zhou, C., Chen, X., Nie, S., Chen, K., Chen, Y., & Zhang, S. (2022). The Migration and Deposition Behaviors of Montmorillonite and Kaolinite Particles in a Two-Dimensional Micromodel. Materials, 15(3), 855. https://doi.org/10.3390/ma15030855

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