Title: counter-current flow Long Title: IUPAC Gold Book - counter-current flow DOI: 10.1351/goldbook.CT06864 Status: current Definition Flow through a membrane module in which the fluids on the upstream and downstream sides of the membrane move parallel to the membrane surface but in opposite directions. Related Term - membrane: https://goldbook.iupac.org//terms/view/MT06878 Source - PAC, 1996, 68, 1479. 'Terminology for membranes and membrane processes (IUPAC Recommendations 1996)' on page 1481 (https://doi.org/10.1351/pac199668071479) Other Outputs - html: https://goldbook.iupac.org/terms/view/CT06864/html - json: https://goldbook.iupac.org/terms/view/CT06864/json - xml: https://goldbook.iupac.org/terms/view/CT06864/xml Citation: Citation: 'counter-current flow' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.CT06864 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. Accessed: 2026-06-29T06:26:31+00:00