Encyclopedia of Membranes

2016 Edition
| Editors: Enrico Drioli, Lidietta Giorno

UF Transport (Ultrafiltration Transport)

Reference work entry
DOI: https://doi.org/10.1007/978-3-662-44324-8_1209

UF membranes are porous solids that selectively retain large solutes and pass liquid solvent and small solutes. The interconnected porous network is sometimes described as a percolating foam structure. It is commonly described by a lognormal distribution of parallel cylindrical pores. Laminar flow of pure solvent through an incompressible membrane follows Darcy’s law J = LmTMP where J is the flux or volumetric flow per unit membrane area, TMP is the transmembrane pressure difference across the membrane, and Lm is the constant membrane permeability. For parallel cylindrical pores of the same radius r, the permeability is \( {L}_m=\frac{\epsilon {r}^2}{8\mu l} \)

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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.EMD Millipore CorporationPlaya del ReyUSA