Lattice Boltzmann method is adopted to investigate the characteristics of double-diffusive natural convection around a heated cylinder in square enclosure with coupled Soret and Dufour effects. The inner heated cylinder is located at the center of the enclosure and four surrounding walls are assumed to be low temperature and concentration. With different parameters of buoyancy ratio
Br
(-5 ≤
Br
≤ 5)
Soret number
Sr
(-0.4 ≤
Sr
≤ 0.4) and Dufour number
Df
(-0.4 ≤
Df
≤ 0.4)
the double-diffusive natural convective characteristics in the enclosure are analyzed.
The results show that
at the same
Br
and with the simultaneously increasing
Sr
and
Df
both the heat and mass transfer capacities are weaken. At the same
Sr
and
Df
the heat and mass transfer capacities are first weakened and then enhanced as
Br
increases. The simulation study of this physical model can provide the theoretical support for the analysis of indoor fire and pollutant diffusion.
关键词
Keywords
references
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