Journal ArticleDOI
Transport of mass in ternary liquid‐liquid systems. Part II. Mass transfer and interfacial studies
Anil Sethy,Harry T. Cullinan +1 more
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TLDR
In this paper, the mass transfer coefficients for the partially miscible binary system and for those ternary experiments in which the slope of the operating line was negative are found to be independent of the driving force.Abstract:
The objective of this work is to experimentally examine mass transfer during liquid-liquid extraction in the system acetonitrile-benzene-n-heptane. The interfacial characteristics of the system are simultaneously investigated. (Part I deals with the diffusion properties of the system).
The mass transfer experiments are conducted in a stirred extraction cell of the Lewis type. The transfer between an unsaturated and nearly saturated phase is studied. The mass transfer coefficients for the partially miscible binary system, and for those ternary experiments in which the slope of the operating line was negative are found to be independent of the driving force. A photographic investigation, which employed the schlieren technique, indicates that Marangoni-type instabilities are absent in such experiments. However, in ternary experiments, in which the slope of the operating line is positive and above a certain critical value the mass transfer coefficients decreases as equilibrium approached. The schlieren results confirm the presence of interfacial turbulence for this case.
The driving-force dependence of the turbulent mass transfer coefficients is explaine using a surface renewal model. The model provides a correlation for the results of ternary experiments in which interfaical turbulence is present.read more
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Highly porous and macrovoid-free PVDF hollow fiber membranes for membrane distillation by a solvent-dope solution co-extrusion approach
Sina Bonyadi,Tai-Shung Chung +1 more
TL;DR: In this article, a two-phase flow consisting of a solvent and a dope solution in the air-gap region of spinning through a non-solvent induced phase separation process (NIPS) was introduced to increase the outer surface porosity of the PVDF fibers.
Journal ArticleDOI
On the contribution of the scales of mixing to the oxygen transfer in stirred tanks
TL;DR: In this article, two main scales of mixing can be considered inside a stirred tank: macromixing and micromicing, and empirical results and empirical equations are used to unveil the contribution of both mechanisms to the volumetric mass transfer coefficient.
Journal ArticleDOI
Mass transfer in a ternary liquid‐liquid system
Harry T. Cullinan,S. K. Ram +1 more
Development of numerical code for the study of marangoni convection
TL;DR: In this paper, a numerical code for solving the time-dependent incompressible 3D Navier-Stokes equations with finite volumes on overlapping staggered grids in cylindrical and rectangular geometry is developed.
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