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Effect of long-range electrostatic repulsion on pore clogging during microfiltration.

Sheng Chen¹, Wenwei Liu¹, Shuiqing Li¹

¹Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China.

Physical Review. E

|January 14, 2017

Summary

Charged microparticle clogging is prevented by particle repulsion, which impacts pore-level flow and particle capture. A phase diagram shows the transition from clogging to non-clogging states based on pressure and charge.

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Area of Science:

Physics
Materials Science
Chemical Engineering

Background:

Clogging of pores by microparticles is a critical issue in filtration and fluid transport.
Understanding the interplay of interparticle forces is essential for controlling clogging dynamics.

Purpose of the Study:

To investigate the role of electrostatic repulsion in the clogging process of charged microparticles at the single-pore level.
To quantify the impact of Coulomb repulsion on bulk permeability, particle penetration, and capture efficiency.
To establish a clogging phase diagram and identify criteria for the clogging-nonclogging transition.

Main Methods:

Computer simulations utilizing adhesive contact mechanics.
Analysis of bulk permeability, number of penetrating particles, and particle capture efficiency.
Construction of a clogging phase diagram based on driving pressure and a charge parameter (κq).

Main Results:

Electrostatic repulsion between charged microparticles significantly delays or prevents clog formation.
A critical state, marked by minimum particle capture efficiency, serves as a non-clogging criterion for repulsive particles.
Clog structure is primarily governed by short-range adhesion, influencing particle penetration.

Conclusions:

Interparticle repulsion is a key factor in mitigating microparticle clogging.
The proposed clogging phase diagram and critical state provide valuable metrics for predicting and controlling clogging phenomena.
Both long-range repulsion and short-range adhesion dictate the overall clogging behavior and outcomes.