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Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 85, 2024 - Issue 1
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Research Articles

Combined effects of thermo-diffusion, diffusion-thermo and internal heat generation on the stabilization/destabilization of the flow in a cavity differentially heated and salted

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Pages 92-113 | Received 16 Aug 2022, Accepted 06 Feb 2023, Published online: 28 Feb 2023
 

Abstract

Lattice Boltzmann simulations of double-diffusive convection in a rectangular cavity differentially heated and salted are conducted in the presence of internal heat generation and Dufour and Soret effects. The study is performed for an aspect ratio A=2, an external Rayleigh number RaE=105, a Lewis number Le=2, a buoyancy ratio N=1, and a Prandtl number Pr=0.71. The study focuses mainly on the effect of Dufour number (Du=0 and 0.5) to measure its impact on the ranges of steady/unsteady solutions reported in a previous study for the Soret parameter ranging from −0.5 to 0.5 and internal to external Rayleigh numbers ratio ranging from 0 to 80. Compared to Du=0, the results obtained show that the presence of Dufour mechanism with a positive value leads to a destabilizing effect by widening the ranges of instability observed for the considered values of Sr. The combinations (Sr, Du) the most stabilizing/destabilizing are identified and discussed in this study.

Disclosure statement

No potential conflict of interest was reported by the author(s).

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