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oai:recercat.cat:2117/1139732026-01-21T04:14:42Zcom_2072_1033col_2072_452950

Marangoni stress induced by free-surface for pressure reduction in reverse osmosis Arias Montenegro, Francisco Javier Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids Saline water conversion--Reverse osmosis process Reverse osmosis Marangoni stress Concentration gradient Aigua salada--Dessalatge--Osmosi inversa © 2018. This version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ Marangoni hydrodynamic motion and its potential technological application in reverse osmosis (RO) process for seawater desalination is discussed. The fundamental core idea in this note is the possibility to take advantage of the inherent concentration gradient in a RO process. It is well known that to run a RO process, it is necessary to apply a hydrodynamic pressure to overcome the osmotic pressure, however, by inducing a free-surface, e.g., a Leidenfrost surface, on the membrane wall, an additional hydrodynamic Marangoni stress could be generated, which, likewise than the osmotic pressure is driven by the concentration gradient but acting in the opposite direction, i.e., reducing the external hydraulic pressure to be applied. Utilizing a simplified geometrical and physical model, an analytical expression for the pressure reduction was derived. One important preliminary result in this work, is that the Marangoni stress can provide pressure against the osmotic pressure for membrane porous that are less than micrometric size. Peer Reviewed Postprint (author's final draft) 2018-02-03 Article https://www.sciencedirect.com/science/article/pii/S0011916417310822 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain