A numerical study of heat and mass transfer in falling film absorber

Journal Article · Mon Feb 01 04:00:00 EST 1999 · International Communications in Heat and Mass Transfer

DOI:https://doi.org/10.1016/S0735-1933(99)00013-5· OSTI ID:334087

Yigit, A ^[1]

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1. Univ. of Uludag, Bursa (Turkey). Dept. of Mechanical Engineering

This paper describes a model of the absorption process in a falling film Lithium Bromide-Water absorber. Absorption of a gas or vapor into a laminar falling film on the surface of a vertical tube is taken into account. Necessary boundary conditions are provided to solve simultaneous parabolic partial-differential equation which are obtained by diffusion and energy equations characterizing absorption process. To solve these partial differential equations Crank-Nichelson Method was used. Solutions for temperature and concentration distributions were obtained by applying these equations is discretized flow field. Nusselt and Sherwood numbers are calculated for absorber. The coolant-side heat transfer coefficient may be calculated using standard correlations. The effect of varying coolant flow rate, solution flow rate and coolant temperature are also studied. Results which are found out from the model are compared with experimental data and analytical results. Agreement is found to be good.

• OSTI ID: 334087
• Journal Information: International Communications in Heat and Mass Transfer, Journal Name: International Communications in Heat and Mass Transfer Journal Issue: 2 Vol. 26; ISSN 0735-1933; ISSN IHMTDL
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ABSORPTION REFRIGERATION CYCLE
FILM FLOW
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL MODELS
NUMERICAL ANALYSIS
TEMPERATURE DISTRIBUTION