Effects of surface active agents on mass transfer during droplet formation, fall, and coalescence

AIChE Journal ◽  
1972 ◽  
Vol 18 (6) ◽  
pp. 1154-1163 ◽  
Author(s):  
A. H. P. Skelland ◽  
C. L. Caenepeel
Keyword(s):  
Mass Transfer ◽  
Droplet Formation ◽  
Surface Active Agents ◽  
Surface Active

The effects of surface films in damping eddies at a free surface of a turbulent liquid

1966 ◽  
Vol 290 (1423) ◽  
pp. 515-526 ◽  
Keyword(s):  
Mass Transfer ◽  
Liquid Surface ◽  
Active Material ◽  
Surface Films ◽  
Surface Renewal ◽  
Elastic Stresses ◽  
Hydrodynamic Behaviour ◽  
Surface Active Agents ◽  
Surface Active ◽  
Surface Active Material

Mass-transfer rates across a gas liquid surface into a turbulent liquid depend markedly on the hydrodynamic behaviour of the liquid immediately subjacent to the interface. Though turbulence is always somewhat damped at a free liquid surface, there may remain significant movements of liquid into the plane of a clean surface. A very small amount of surface-active material, however, sets up gradients of surface tension between different parts of the surface, and the accompanying (elastic) stresses are shown to damp very strongly eddies approaching the surface, thus reducing the rate of ‘surface renewal’: mass-transfer of a solute across the liquid surface is correspondingly retarded. This paper treats these phenomena quantitatively, and includes five predictions of the effects of surface-active agents. Comparison is made with published experimental data.

Effects of surface-active agents on mass transfer inside drops

1979 ◽  
Vol 34 (2) ◽  
pp. 217-224 ◽  
Author(s):  
L. Mekasut ◽  
J. Molinier ◽  
H. Angelino
Keyword(s):  
Mass Transfer ◽  
Surface Active Agents ◽  
Surface Active

The effect of surface active agents on the mass transfer coefficient in vertical film flow of liquid over the surface of expanded metal sheet packing

1986 ◽  
Vol 51 (2) ◽  
pp. 302-313 ◽  
Author(s):  
Zdeněk Brož ◽  
Mirko Endršt
Keyword(s):  
Mass Transfer ◽  
Film Flow ◽  
Metal Sheet ◽  
Expanded Metal ◽  
Surface Active Agents ◽  
Interfacial Surface ◽  
Interfacial Mass Transfer ◽  
Poorly Soluble ◽  
Surface Active ◽  
Moving Liquid

Experimental data have been used on absorption of poorly soluble gases, helium, carbon dioxide, and propane, to study the mechanism of interfacial mass transfer in vertical gravitational film flow down the surface of the expanded metal sheet. It has been found that upon addition of surface active agents into water, the original almost freely moving liquid-gas interfacial surface behaves similarly as a liquid-solid surface. Two adjustable hydrodynamic parameters have been evaluated on the basis of the film penetration theory with the physical meaning of the dimensionless thickness of an unmixed region near the interface ϑ+ = 0.4 and the characteristic length < scale of the disturbance λ+ = 26.4.

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