Transport of soluble surfactant on and within a foam film in the context of a foam fractionation process

Tools

Rajabi, Hamed and Grassia, Paul (2023) Transport of soluble surfactant on and within a foam film in the context of a foam fractionation process. Chemical Engineering Science, 265. 118171. ISSN 0009-2509 (https://doi.org/10.1016/j.ces.2022.118171)

[thumbnail of Rajabi-Grassia-CES-2022-Transport-of-soluble-surfactant-on-and-within-a-foam-film]
Preview
 Text. Filename: Rajabi_Grassia_CES_2022_Transport_of_soluble_surfactant_on_and_within_a_foam_film.pdf
Final Published Version
License: Creative Commons Attribution 4.0 logo
Download (1MB)| Preview

Abstract

This study models soluble surfactant transport on and within a foam film during a foam fractionation process. Marangoni flow drives surfactant onto the film, and also surfactant concentration is assumed to be uniform across the thin foam film. Adsorption isotherms are used to couple mass transfer equations, so as to determine the evolution of the total amount of surfactant (surface plus bulk) at any film location. Surfactant transport is considered both in the absence and presence of film drainage. It is observed that having soluble surfactant slows down evolution of Marangoni driven flow compared to cases assuming insoluble surfactant. This is because in soluble surfactant cases, surfactants diffuse to the bulk even whilst being transferred by Marangoni flow onto the film surface. Furthermore, it is observed that a quasisteady state typically occurs after a long time, such that Marangoni flow and film drainage flow become comparable.

ORCID iDs

Rajabi, Hamed and Grassia, Paul ORCID logoORCID: https://orcid.org/0000-0001-5236-1850;
CORE (COnnecting REpositories)