Predicting optimal back-shock times in ultrafiltration hollow fibre modules through path-lines

Frank Vinther, Manuel Pinelo, Morten Brøns, Gunnar Eigil Jonsson, Anne S. Meyer

Research output: Contribution to journalJournal articleResearchpeer-review


This paper presents a two dimensional mathematical model of back-shocking in ultrafiltration. The model investigates the effect of back-shocking on concentration polarization. The model shows a positive effect on both the volumetric flux and the observed rejection when back-shocking is applied as compared to the steady-state solution. Furthermore, the effect of changing different parameters such as inlet velocity, forward and backwards pressure on the back-shock time, the increase in volumetric flux and observed rejection, is presented. Moreover, two analytical estimates for the optimal back-shock time derived from calculating the path-lines during a back-shock cycle are presented. Both of these expressions are in good agreement with the results obtained from the mathematical model and data collected from the literature. Based on this, a simple expression for an optimal back-shock time in a multi-parameter problem is provided.
Original languageEnglish
JournalJournal of Membrane Science
Pages (from-to)275-293
Publication statusPublished - 2014


  • Back-shocking
  • Membrane separation
  • CFD
  • Mathematical modelling
  • Ultrafiltration


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