Effects of a Nonabsorbable Gas on Interfacial Heat and Mass Transfer for the Entrance Region of a Falling Film Absorber

[+] Author and Article Information
T. A. Ameel

Department of Mechanical and Industrial Engineering, Lousiana Tech University, Ruston, LA 71272

H. M. Habib

El-Menoufia University, Shebin, El-Kom, Egypt

B. D. Wood

Mechanical and Aerospace Engineering, Center for Energy Systems Research, College of Engineering and Applied Sciences, Arizona State University, Tempe, AZ 85287-5806

J. Sol. Energy Eng 118(1), 45-49 (Feb 01, 1996) (5 pages) doi:10.1115/1.2847928 History: Received November 01, 1994; Revised January 01, 1995; Online February 14, 2008


An analytical solution is presented for the effect of air (nonabsorbable gas) on the heat and mass transfer rates during the absorption of water vapor (absorbate) by a falling laminar film of aqueous lithium bromide (absorbent), an important process in a proposed open-cycle solar absorption cooling system. The analysis was restricted to the entrance region where an analytical solution is possible. The model consists of a falling film of aqueous lithium bromide flowing down a vertical wall which is kept at uniform temperature. The liquid film is in contact with a gas consisting of a mixture of water vapor and air. The gas phase is moving under the influence of the drag from the falling liquid film. The governing equations are written with a set of interfacial and boundary conditions and solved analytically for the two phases. Heat and mass transfer results are presented for a range of uniform inlet air concentrations. It was found that the concentration of the nonabsorbable gas increases sharply at the liquid gas interface. The absorption of the absorbate in the entrance region showed a continuous reduction with an increase in the amount of air.

Copyright © 1996 by The American Society of Mechanical Engineers
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