Mass transfer in elongational laminar and turbulent flows of drag reducing solutions of quaternary ammonium surfactants. Influence of the counter-ion to surfactant concentrations ratio

Abstract : Electrochemical method was used to study in elongational laminar and turbulent flows the mass transfer toward a rotating disk in different drag reducing solutions of two cationic surfactants (Arquad 16-29, Arquad S50) together with counter ions (Para-chloro benzoate, Nasal) by varying the concentrations of their mixture. The mass transfer in laminar flow conditions displays a first order transition characterized by a significant drop accompanied by strong instabilities and a hysteresis cycle at a critical angular velocity which depends on the counter ion to surfactant concentrations ratio ζ. The local wall shear stress in turbulent flow was measured using a microelectrode inserted flush with the cross-section of the rotating disk. The ζ ratio influences the drag reduction onset: Arquad 16-29 was shown to be more efficient at lowest concentration values than the Arquad S50 for both the critical velocity transition in laminar flow and the onset of drag reduction in turbulent flow.
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Chemical Engineering and Processing: Process Intensification, Elsevier, 2015, 93, pp.34 - 43. 〈10.1016/j.cep.2015.04.006〉
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http://hal.upmc.fr/hal-01585090
Contributeur : Véronique Martin <>
Soumis le : lundi 11 septembre 2017 - 10:48:32
Dernière modification le : jeudi 11 janvier 2018 - 06:25:45

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M.S. Boutoudj, A. Ouibrahim, Claude Deslouis. Mass transfer in elongational laminar and turbulent flows of drag reducing solutions of quaternary ammonium surfactants. Influence of the counter-ion to surfactant concentrations ratio. Chemical Engineering and Processing: Process Intensification, Elsevier, 2015, 93, pp.34 - 43. 〈10.1016/j.cep.2015.04.006〉. 〈hal-01585090〉

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