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Turbulent liquid film evaporation in a partially heated wall along a vertical tube
Author(s) -
Alami Samy,
Feddaoui Mbarek,
Nait Alla Abderrahman,
Bammou Lahcen,
Souhar Khalid
Publication year - 2021
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.21975
Subject(s) - laminar flow , turbulence , mechanics , heat flux , evaporation , materials science , tube (container) , momentum (technical analysis) , thermodynamics , heat transfer , mass flux , work (physics) , physics , composite material , finance , economics
Abstract In this numerical study, the evaporative heat and mass transfer of a turbulent falling liquid film in a finite vertical tube are investigated. The liquid film flows in the tube's inner wall, whose outer wall is partially subject to thermal flux. Here, different configurations corresponding to thermal flux imposed on different external surface wall percentages are examined. External face zones where the heat flux is not applied are maintained insulated. The nonlinear set of parabolic mass, momentum, energy, and mass fraction conservation equations combined with boundary and interfacial conditions are treated numerically using implicit finite difference procedure. For falling liquid film analysis, an adapted Van Driest turbulence model is used. For the present work, it is supposed that gas flows in a laminar regime. We examine in this paper the impact of the percentage of heated surface area on flows as well as on heat and mass transfer. Obtained results for a partially heated wall are compared with those produced for an entirely heated wall.