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Inducing Deep Sweeps and Vortex Ejections on Patterned Membrane Surfaces to Mitigate Surface Fouling.

August H Young^1,2, Nico Hotz², Brian T Hawkins^1,3

¹Duke Center for WaSH-AID, Durham, NC 27701, USA.

|January 22, 2024

Summary

Rapidly pulsed crossflow in patterned membranes prevents particle buildup. This hydrodynamic approach mitigates concentration polarization and fouling, reducing the need for chemical cleaning.

Keywords:

concentration polarization deep sweep filtration fouling mitigation pulsed flow surface pattern vortex ejection

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Area of Science:

Fluid dynamics
Membrane science
Surface engineering

Background:

Patterned membrane surfaces are used to reduce concentration polarization and fouling.
However, steady crossflow causes particle accumulation in patterned membrane surface cavities.
This accumulation exacerbates fouling and reduces membrane efficiency.

Purpose of the Study:

To investigate the use of rapidly pulsed crossflow to mitigate particle accumulation in patterned membrane surfaces.
To understand the fluid dynamics mechanisms responsible for particle removal.
To assess the potential for reducing fouling and the need for traditional cleaning methods.

Main Methods:

Numerical simulation of a two-dimensional patterned membrane surface.
Application of a rapidly pulsed crossflow.
Massless particle tracking to analyze particle movement and accumulation.
Analysis of fluid mixing mechanisms like deep sweep and vortex ejection.

Main Results:

A rapidly pulsed crossflow disrupts recirculation zones in patterned membrane cavities.
Mixing mechanisms (deep sweep, vortex ejection) effectively remove trapped particles.
Over 50% particle removal was achieved within four pulses.
The pulsed flow prevents particle accumulation that occurs under steady crossflow.

Conclusions:

Rapidly pulsed crossflow is an effective hydrodynamic strategy for patterned membranes.
This method mitigates concentration polarization and fouling by preventing particle accumulation.
It offers a potential alternative to conventional cleaning methods, minimizing downtime and chemical use.