Natural Convection Effect On A Wetting Liquid Droplet In Square Cavity By Using The ShanChen LBM Model
[Full Text]
AUTHOR(S)
Salaheddine CHANNOUF, Mohammed JAMI, Ahmed MEZRHAB
KEYWORDS
Lattice Boltzmann method, ShanChen LBM model, natural thermal convection, wetting surface, wettability phenomenon.
ABSTRACT
The lattice Boltzmann method is used to simulate twophase flows by using the pseudopotential scheme proposed by ShanChen [1,2] which is also called ShanChen LBM model. Firstly, our code is tested for the wettability phenomenon of a liquid drop on the solid surface (Huang et al. [3]) and for the natural thermal convection in a square enclosure (Mezrhab et al. [4]), respectively. In the last case, the same value of the fluid densities (single phase) is considered. Results agree well with those of the references, give a good precision of this method and confirm that the proposed model can be reliably used to simulating the multiphase flows and the heat exchange. Secondly, we have studied the interaction between the liquid drop and natural convection inside a differentially heated square cavity by fixing the density of the solid surface and by varying the Rayleigh number from 10³ to 〖10〗^6. Results show that the liquid drop moves under the effect of gas flow caused by the convection and it evaporates by exchanging heat with gas. It will be said that the wettability "spreading of the drop phenomenon" is eliminated under the effect of natural convection and it is thus possible to avoid the deposition of droplets on the solids, this behavior can be very useful in the industry.
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