An elliptic numerical analysis of water vapour absorption into a falling film in vertical parallel plate channels

•Two-phase numerical model of falling film absorption with co-current gas-phase.•Full elliptic governing equations with fundamental interface conditions.•Dynamically calculated precise phase interface tracking.•Implicitly coupled solution of both phases.•Applied to LiBr aqueous solution and water va...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2020-04, Vol.150, p.119266, Article 119266
Main Authors: Havestini, Robabeh Abbasi, Ormiston, Scott J.
Format: Article
Language:English
Subjects:
Boundary conditions
Diffusion coefficient
Elliptic equations
Falling
Falling film absorption
Film thickness
Finite element method
Heat of absorption
Heat transfer
Inlet pressure
Laminar flow
LiBr solution
Mass transfer
Mathematical models
Numerical analysis
Numerical model
Numerical models
Parallel plates
Pressure effects
Sharp interface
Two-phase
Water vapor
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Summary:•Two-phase numerical model of falling film absorption with co-current gas-phase.•Full elliptic governing equations with fundamental interface conditions.•Dynamically calculated precise phase interface tracking.•Implicitly coupled solution of both phases.•Applied to LiBr aqueous solution and water vapour.•Detailed results presented that can be suitable for model validation by others. An implicitly coupled elliptic numerical model is applied to study the two-phase falling film absorption inside a parallel plate vertical channel. A complete set of two-phase two-dimensional governing equations are solved for co-current laminar flows of LiBr solution and water vapour. A precise liquid-gas interface is determined dynamically during solution over a non-orthogonal structured moving mesh. Fundamental interface boundary conditions are implemented to model the heat and mass interchange between the two phases. The capability of this new model is demonstrated through detailed comparisons with two previous parabolic and elliptic models. The impacts of the interface heat of absorption and mass fraction condition and the liquid film diffusion coefficient are investigated. New results are presented to examine the channel inlet pressure effect on the liquid film thickness development over the cold wall and the heat and mass transfer at the interface.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2019.119266