Effect of an Inert Gas on Heat and Mass Transfer in a Vertical Channel With Falling Films

[+] Author and Article Information
Wei Chen, G. C. Vliet

Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712

J. Sol. Energy Eng 119(1), 24-30 (Feb 01, 1997) (7 pages) doi:10.1115/1.2871803 History: Received September 15, 1995; Revised April 16, 1996; Online February 14, 2008


The effect of inert (noncondensable) gases on the heat and mass transfer (absorption) for channel flow of water vapor in conjunction with falling aqueous LiBr films is investigated. The hydrodynamic flow of the gas in the channel is approximated as fully developed. This is a “fair” assumption because of the low Reynolds numbers resulting from the low prevailing absorber pressures. The film flow is also assumed to be hydrodynamically developed. This greatly simplifies the problem, as the momentum equation need not be considered. Otherwise the continuity, species, and thermal energy equations govern the problem. Numerical results for a nominal case are presented for the velocity, temperature, and species distributions in the gas and liquid phase regions, and for the interface absorption rate. The effects of varying several parameters (including inerts concentration) on the above variables are also presented. Comparisons are also made with limited data in the literature.

Copyright © 1997 by The American Society of Mechanical Engineers
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