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Journal Articles International Journal of Heat and Mass Transfer Year : 2009

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

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.
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Dates and versions

hal-03561309 , version 1 (08-02-2022)

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Gaëtan Desoutter, Chawki Habchi, Bénédicte Cuenot, Thierry Poinsot. DNS and modeling of the turbulent boundary layer over an evaporating liquid film. International Journal of Heat and Mass Transfer, 2009, 52 (25 - 26), pp.6028-6041. ⟨10.1016/j.ijheatmasstransfer.2009.06.039⟩. ⟨hal-03561309⟩
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