The liquid side mass transfer coefficient in a film of liquid trickling down an expanded metal sheet packing

1980 ◽  
Vol 45 (5) ◽  
pp. 1343-1345
Author(s):  
Jan Lacina ◽  
Václav Kolář
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Metal Sheet ◽  
Expanded Metal

The paper presents experimentally obtained values of the liquid side mass transfer coefficient in a liquid film trickling down an expanded metal sheet packing and their analysis based on the model of unsteady absorption.

Liquid side mass transfer coefficient and interfacial area at vertical liquid flow on expended metal sheet packing

1980 ◽  
Vol 45 (11) ◽  
pp. 3089-3100 ◽  
Author(s):  
Zdeněk Brož ◽  
Mirko Endršt
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Liquid Flow ◽  
Empirical Relation ◽  
Interfacial Area ◽  
Expanded Metal ◽  
Wide Range ◽  
Predicted Values ◽  
Good Agreement

Prediction of the liquid side mass transfer coefficient k1 at vertical liquid flow on the expanded metal packing is based on the penetration model according to Higbie. The experimental value of mass transfer coefficient k1 at absorption of sparingly soluble gases with differing diffusivities in water (propane, carbon dioxide and helium) are in a good agreement with the predicted values in a wide range of linear wetting densities. Interfacial area is determined by the chemical method and is correlated by an empirical relation.

The gas side mass transfer coefficient in the turbulent flow in a packing with a significant dependence of the interfacial area on the density of irrigation

1984 ◽  
Vol 49 (12) ◽  
pp. 2756-2762
Author(s):  
Jan Červenka ◽  
Václav Kolář
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Flow ◽  
Interfacial Area ◽  
Two Phase ◽  
Expanded Metal ◽  
Significant Dependence ◽  
Experimental Values ◽  
Density Of Irrigation

A theoretically derived relationship has been applied for the gas-side mass transfer coefficient to experimental values of kG. The experimental data have been obtained under the two-phase flow of gas and liquid in a plane vertical packing manufactured of the expanded metal sheet. This packing exhibits a significant dependence of the extent of interfacial area, and hence the geometry of the channel available for gas flow, on the density of irrigation.

scholarly journals Influence of Groove Structure Parameters Based on Optimal Mass Transfer Coefficient on Vaporization Characteristics and Sealing Performance of Liquid Film Mechanical Seals

2021 ◽  
Vol 11 (19) ◽  
pp. 8941
Author(s):  
Xiaodong Xu ◽  
Chenbo Ma ◽  
Yuyan Zhang ◽  
Jianjun Sun ◽  
Qiuping Yu
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Vapor Phase ◽  
Volume Fraction ◽  
Helix Angle ◽  
Groove Depth ◽  
Phase Volume ◽  
Phase Volume Fraction

In this study, a spiral groove liquid film vaporization model based on the viscosity–temperature equation, fluid internal friction, saturation temperature, and pressure relationship equation was established. Using a multiphase flow model based on the finite volume method, the influence of the change in the mass transfer coefficient on the vaporization of the liquid film was studied. Moreover, the influence law of structural parameter changes in liquid film vaporization characteristics and sealing performance was analyzed. The results indicate that, with an increase in the mass transfer coefficient, the average vapor phase volume fraction first increases and then gradually stabilizes. When calculating the average vapor phase volume fraction, it is necessary to consider the influence of the mass transfer coefficient, whereas its effect on the opening force and leakage can usually be neglected. Under the optimal mass transfer coefficient conditions, the average vapor phase volume fraction increases with an increase in the helix angle, groove-weir ratio, and groove depth. By comparison, with an increase in the groove-diameter ratio, the average vapor phase volume fraction first increases and then decreases. The opening force decreases with an increase in the helix angle, groove-to-weir ratio, and groove depth. On the other hand, it first decreases and then increases with an increase in the groove-diameter ratio. The leakage rate increases first and then stabilizes with an increase in the helix angle. Moreover, it increases continuously with an increase in the groove-diameter ratio, groove-weir ratio, and groove depth.

Effect of liquid viscosity on liquid side mass transfer coefficient at vertical film flow on expanded metal sheets

1983 ◽  
Vol 48 (3) ◽  
pp. 861-876 ◽  
Author(s):  
Zdeněk Brož ◽  
Mirko Endršt
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Kinematic Viscosity ◽  
Film Flow ◽  
Vertical Surface ◽  
Liquid Viscosity ◽  
Expanded Metal ◽  
Metal Sheets ◽  
Good Agreement

Experimental results are presented on the effect of liquid viscosity on absorption rate of carbon dioxide into a liquid film flowing downward the vertical surface of expanded metal sheets. On basis of these results the conclusion has been reached that the Highbie model does not enable to predict the effect of kinematic viscosity on liquid side mass transfer coefficient k1. The film-penetration model has been proposed where the existence of non-mixed region is assumed at the interface with the thickness ϑ and to it periodically incoming disturbances with the length scale of disturbance λ and characteristic Reynolds number of disturbance equal to one. On basis of experimental data were evaluated the dimensionless thicknesses of the film and penetration regions ϑ+ = 0.04 and λ+ = 10.6. A good agreement of the measured and calculated values of the mass transfer coefficient k1 were obtained for three types of expanded metal sheets of vertical pitch diagonal 10, 16 and 28 mm and nine liquids with kinematic viscosities within the range from 0.6 to 15.1 μm2s-1.

Hydrodynamics and mass transfer in turbulent liquid film flow involving the inlet portion

1981 ◽  
Vol 46 (2) ◽  
pp. 467-477 ◽  
Author(s):  
L. P. Kholpanov ◽  
V. A. Malyusov ◽  
N. M. Zhavoronkov
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Film Flow ◽  
Experimental Results ◽  
Inlet Section ◽  
Liquid Film Flow

Relationship for mass transfer coefficient in turbulent liquid film flow involving the inlet section have been derived theoretically. It was found that previously published experimental results were well explained by this theory.

Improvement of oxygen transfer efficiency in aerated ponds using liquid-film-assisted approach

2007 ◽  
Vol 55 (11) ◽  
pp. 183-191 ◽  
Author(s):  
H. Zhu ◽  
T. Imai ◽  
K. Tani ◽  
M. Ukita ◽  
M. Sekine ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Oxygen Transfer ◽  
Structural Parameters ◽  
Volumetric Mass Transfer Coefficient ◽  
Aeration System ◽  
Film Forming ◽  
Oxygen Transfer Efficiency

In aerated ponds, oxygen is generally supplied through either diffused or mechanical aeration means. Surface transfer and bubble transfer both contribute significantly to oxygen transfer in a diffused aeration system. In the present study, a liquid-film-forming apparatus (LFFA) is successfully developed on a laboratory scale to improve considerably the surface transfer via the unique liquid film transfer technique. The experimental results show that the volumetric mass transfer coefficient for LFFA alone is found to be as much as 5.3 times higher than that for water surface and that the total volumetric mass transfer coefficient for the liquid film aeration system increases by 37% in comparison with a conventional aeration system. Additionally, by tuning finely the structural parameters of the LFFA, it can also lead to high dissolved oxygen (DO) water with the DO percent saturation greater than 90%. More importantly, this result is accomplished by simply offering a single-pass aeration at a depth as shallow as 26 cm. As a result, the objective of economical energy consumption in aerated ponds can be realized by lowering the aeration depth without sacrificing the aeration efficiency. It is noteworthy that the data presented in this study are acquired either numerically or experimentally.

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