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Textbook (Source) : Membrane Technology and applications (Richard W. Baker, John Wiley & Sons, 2 nd Ed)

Membrane Processes

• Pressure-driven processes – MF, UF, NF, RO

• A simple model of liquid flow through membranes with

different pore diameters

 d 4
q   p Poiseuille’s law
128 l


where q is the liquid flow through a pore, Δp is the pressure
difference across the pore, μ is the liquid viscosity, and l is the pore
length

 d 4
J  N   p

128 l

where J is the flux (flow per unit membrane area) and N is the
number of pores per square centimeter of membrane