Comparison between Random and Structured Packings for Dehumidification of Air by Lithium Chloride Solutions in a Packed Column and Their Heat and Mass Transfer Correlations

1996 ◽  
Vol 35 (1) ◽  
pp. 192-198 ◽  
Author(s):  
Tsair-Wang Chung ◽  
Tushar K. Ghosh ◽  
Anthony L. Hines
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Lithium Chloride ◽  
Packed Column ◽  
Chloride Solutions ◽  
Structured Packings

Simultaneous Heat and Mass Transfer in Film Absorption With the Presence of Non-Absorbable Gases

2000 ◽  
Vol 123 (5) ◽  
pp. 984-989 ◽  
Author(s):  
Hamza M. Habib ◽  
Byard D. Wood
Keyword(s):  
Mass Transfer ◽  
Water Vapor ◽  
Heat And Mass Transfer ◽  
Lithium Chloride ◽  
Numerical Solutions ◽  
Adiabatic Wall ◽  
Average Mass ◽  
Mass Fluxes ◽  
Wide Range ◽  
Aqueous Lithium Bromide

Numerical solutions are presented for the effect of a non-absorbable gas on the heat and mass transfer rates during the absorption of water vapor by a falling laminar smooth film of an aqueous lithium bromide or aqueous lithium chloride solution (absorbent). The geometry consists of a vertical channel with two walls, one of which is isothermal and the other adiabatic. The liquid film of an absorbent flows down over the isothermal wall, while a mixture of water vapor and air flows between the liquid free-surface and the adiabatic wall. The whole system is kept under vacuum pressure. Water vapor is absorbed by the film and air is the non-absorbable gas. The momentum, energy, and concentration equations are written with a set of interfacial and boundary conditions and solved numerically for the two phases. Variable property effects are included, as well as the interfacial shear. Heat and mass transfer results are presented over a wide range of inlet air concentrations. The average mass fluxes showed a continuous reduction with an increase in the amount of air for a concentration of air as high as 40 percent by weight. But the local mass fluxes showed a different behavior from the absorption of a pure vapor case. The decrease was much higher at the entrance than in a pure vapor case. The numerical results are in good agreement with the experimental data available for lithium chloride. The model has promise as means of predicting the heat and mass transfer characteristics of falling film absorber.

scholarly journals INDICATORS OF ENERGY AND SEPARATION EFFICIENCY OF GAS SEPARATORS INTENDED TO REMOVE AEROSOL DROPLETS

2019 ◽  
Vol 21 (1-2) ◽  
pp. 3-9
Author(s):  
A. G. Laptev ◽  
M. M. Basharov ◽  
E. A. Lapteva
Keyword(s):  
Mass Transfer ◽  
Energy Efficiency ◽  
Heat And Mass Transfer ◽  
Separation Efficiency ◽  
Energy Separation ◽  
Structured Packings ◽  
Random Packings ◽  
Spiral Wound

Abstract: Energy coefficients and energy efficiency criteria for heat and mass transfer devices are considered. With application of these coefficients and criteria, modified complexes for the energy separation efficiency of packed-type gas separators aimed to remove liquid aerosols are obtained. Technical characteristics of structured and random packings are given and calculations of energy complexes and of the power required for supplying gas to the purification are made. It is determined that the spiral-prismatic packing is most efficient among all considered random packings and the spiral wound packing RGN-5 (manufactured by LLC EPC “Inzhekhim”) is most efficient among all considered structured packings.

Comparative Heat and Mass Transfer Tests of Structured Packings with Film and Droplet Flow

2019 ◽  
pp. 4-21
Author(s):  
E.K. Aliev ◽  
V.V. Volodin ◽  
V.V. Golub ◽  
A.Yu. Mikushkin ◽  
G.G. Timerbaev ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Mass Exchange ◽  
Gas Flow ◽  
Packed Bed ◽  
Hydraulic Characteristics ◽  
Heat And Mass Exchange ◽  
Contact Devices ◽  
Structured Packings ◽  
Gas Volume

The paper focuses on comparative studies of heat and mass transfer and hydraulic characteristics of two structured packings which provide heat and mass transfer of contacting media in the film flow of liquid Mellapak 250.X and with fluid dispersion in the gas volume PVN.22. The experiments were carried out in a heat-mass exchange column of 400 mm in diameter and of 1 m in height of a packed bed. The method of evaporative cooling of water in the air flow was adapted to obtain heat and mass exchange characteristics of packed contact devices. Findings of research show the effect of irrigation density and gas flow on heat and mass transfer and hydraulic characteristics of packings which provide heat and mass transfer of contacting media in film and droplet flows. A criterion for estimating the efficiency of contact devices is proposed.

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