By: Keka Rana and Debasish Sarkar
Haldia Institute of Technology, Haldia, India
Membrane-based separation has been in rigorous applications in health services since the last few
decennia. Dynamic Shear Enhanced Membrane Filtration Pilots (DSEMFPs) is a promising membrane
module. The first reported DSEMFPs was a Couette flow type module in 1985. It was used for collecting
plasma from donors. This module consists of two concentric cylinders. The outer one is fixed while the
inner one is rotating, having a membrane on the outer surface of it. High rotational velocities generate
Taylor vortices. These Taylor vortices and small annular spaces easily create high shear on the
membrane surface to efficiently control concentration polarization (CP), subsequent fouling and
maintain the minimum decline of permeate flux. The exhaustive analysis of this DSEMFP required for
large-scale applications. The absence of this instigates further detailed study of it. In particular, shear
stress distribution on the membrane surface with varying transmembrane pressure and rotational
velocity is vital. Moreover, for a clear understanding of the default interior, turbulent kinetic energy,
turbulent kinetic energy dissipation rate, velocity vector, strain rate and vortices are also studied. All
the analyses suggest the positive effect of the high rotational speed of the inner cylinder for maximum
permeate output.
Citation:
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