Modified analysis of permeate flux for ultrafiltration in a solid-rod tubular membrane

Resistance-in-series analysis of the permeate flux for ultrafiltration in a tubular membrane with a steel rod inserted concentrically was modified by momentum and mass balances with the consideration of declinations of flow rate and transmembrane pressure along the flow channel. The present theoretical predictions were improved as compared with those obtained in previous work and with the experimental results for the ultrafiltration of dextran T500 aqueous solution carried out in a solid-rod tubular ceramic membrane module made of ZrO2/CO2.