Mass transfer into the liquid in turbulent flow at high Schmidt numbers. Theoretical solution

1981 ◽  
Vol 46 (6) ◽  
pp. 1445-1457
Author(s):  
František Vašák ◽  
Václav Kolář ◽  
Zdeněk Brož
Keyword(s):  
Mass Transfer ◽  
Velocity Profile ◽  
Turbulent Flow ◽  
Theoretical Solution ◽  
Theoretical Relation ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Entrance Section ◽  
Schmidt Numbers ◽  
Steady Velocity

Theoretical relation is derived describing the mass transfer into the liquid in turbulent flow with steady velocity profile, at high Schmidt numbers Sc ≥ 103 in the concentration entrance section. Graphical dependences describing the effect of parameters of the model on mass transfer coefficients are presented and discussed. It is demonstrated that for the limiting cases the derived theoretical solution transforms into familiar relations (asymptotes).

Analysis of Flow Field and Impingement Heat/Mass Transfer Due to a Nonuniform Slot Jet

1975 ◽  
Vol 97 (2) ◽  
pp. 191-197 ◽  
Author(s):  
E. M. Sparrow ◽  
L. Lee
Keyword(s):  
Mass Transfer ◽  
Velocity Profile ◽  
Inviscid Flow ◽  
Separation Distance ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Flow And Heat Transfer ◽  
Laminar Channel Flow ◽  
Inviscid Flow Model ◽  
Impingement Surface

An analysis is made of the fluid flow and heat transfer characteristics associated with the impingement of a slot jet which issues from a delivery duct with a nonuniform velocity profile. Consideration is given to velocity profiles similar to that for a fully developed laminar channel flow. The velocity field within the impinging jet is solved for within the framework of an inviscid flow model. Results from the inviscid solution are used as input for the analysis of the boundary layer heat or mass transfer on the impingement surface. The stagnation point heat (or mass) transfer coefficients corresponding to the initially nonuniform velocity profile are found to be almost twice as large as those for an initially flat velocity profile. Furthermore, the transfer coefficients are insensitive to the separation distance between the duct exit and the impingement surface, within the range investigated. The analytical results compared satisfactorily with experimentally determined mass transfer coefficients.

Henry's constants and mass transfer coefficients of halogenated organic pollutants in an air stripping packed column

1998 ◽  
Vol 38 (6) ◽  
pp. 287-294 ◽  
Author(s):  
Pen-C. Chiang ◽  
Chung-H. Hung ◽  
J. C. Mar ◽  
E. E. Chang
Keyword(s):  
Mass Transfer ◽  
Methylene Chloride ◽  
Packed Column ◽  
Transfer Coefficients ◽  
Chlorinated Organic Compounds ◽  
Air Stripping ◽  
Mass Transfer Coefficients ◽  
Equilibrium Partition ◽  
Henry's Constants ◽  
Chlorinated Organic

Both Henry's constants and volumetric mass transfer coefficients (KLa) of eight priority chlorinated organic compounds including 1,1-dichloroethene, methylene chloride, chloroform, carbon tetrachloride, 1,1,1-trichloroethane, trichloroethylene, tetrachloroethylene, and 1,4-dichlorobenzene in an air stripping packed column were investigated in this study. The liquid and gas phase EPICS (Equilibrium Partition in Closed System) and direct calculating methods were applied to determine the Henry's constants of VOCs. The interference of co-solute on Henry's constants was also investigated. Experimental results indicated that decrease in Henry's constants of VOCs was observed in the presence of humic acid but no apparent effect on Henry's constants was detected when there was NaCl and surfactant in solution. Four different configurations of packing media including Intalox Saddle, Super Intalox Saddle, Telleret, and Hedgehog made of polypropylene were respectively packed in the air stripping tower and investigated in the study. The dependence of hydraulic loading, air-water ratio, and configurations of packing media on mass transfer coefficients of VOCs was discussed.

Transport of chlorinated hydrocarbons between sewage and sewer atmosphere

1996 ◽  
Vol 34 (3-4) ◽  
pp. 557-564 ◽  
Author(s):  
Bettina S. Haas ◽  
Reimer Herrmann
Keyword(s):  
Mass Transfer ◽  
Aromatic Compounds ◽  
Chlorinated Hydrocarbons ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Sewerage System ◽  
Mass Fluxes ◽  
Single Compound

Sewage containing volatile contaminants is a potential VOC-source in cities. Thus we tried to evaluate volatilization out of the sewerage system by measurements of contaminants in sewer gas and sewage. Our results from a medium sized town with little industry showed that sewer gas is mainly contaminated with alkanes, small aromatic compounds and chlorinated hydrocarbons. For three chlorinated hydrocarbons (chloroform, trichloroethene, tetrachloroethene) we determined mass transfer coefficients out of sewage and used these data to estimate mass fluxes from sewage and emissions out of the sewerage system for two sewer stretches. Considerable emission of chlorinated hydrocarbons from sewage, i.e. fluxes of some 10 to 100 g per m2·d, occurred only when the contaminant input via sewage was between some g and mg per litre for a single compound. For concentrations that were about 3 orders of magnitude less, emissions were negligible.

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