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DNS and modeling of the turbulent boundary layer over an evaporating liquid film

Desoutter, Gaëtan and Habchi, Chawki and Cuenot, Bénédicte and Poinsot, Thierry DNS and modeling of the turbulent boundary layer over an evaporating liquid film. (2009) International Journal of Heat and Mass Transfer, 52 (25 - 26). 6028-6041. ISSN 0017-9310

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Official URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2009.06.039

Abstract

In this paper, Direct Numercial Simulation (DNS) is used to study the boundary layer above an evaporating liquid film in the fully developed turbulent channel flow configuration. First, the numerical results of an isothermal flow are compared to the reference results of Kim et al. [1] to check the validity and the accuracy of the present approach. Next, the calculations are repeated for an anisothermal case where hot gas is flowing between cold walls. The numerical results corroborate those of Nicoud [2] and Huang & Coleman [3], introducing modified dimensionless variables. Finally, an evaporating liquid film is added at the walls. The complexity of the interaction between the evaporation process and the boundary layer structure, as well as its strong dependence on the transient thermophysical properties of the mixture are highlighted. As in the anisothermal case, the classical wall units are no longer adapted to build wall functions and new dimensionless variables are proposed. In addition a wall function must be developed for the evaporating species mass fraction, using a new dimensionless wall variable. It is shown that using these new variables allows to derive new wall functions for momentum, temperature and mass that lead to a correct description of the boundary layer when compared to DNS. These new wall functions may be directly implemented in CFD codes to take into account the impact of an evaporating liquid film.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at International Journal of Heat and Mass Transfer website : http://www.journals.elsevier.com/international-journal-of-heat-and-mass-transfer
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > IFP Energies Nouvelles - IFPEN (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: imft imft
Deposited On:26 Oct 2009 16:06

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