Free Convection in a Vertical Duct: Numerical Study
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Date
2011
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Abstract
The subject of this paper is a direct numerical study of laminar and
laminar-to-turbulent transient natural convection in a vertical duct,
with a constant wall temperature, that exceeds the ambient fluid temperature. The governing equations are solved without modeling of the
turbulence effect using a finite volume method. We presented the
fields of velocity, temperature, and pressure as well as variation of
the mean Nusselt number as a function of the Rayleigh number. The
numerical simulation has been made for the Rayleigh number in the
range from 1 to 105 for aspect ratios 3, 5, 8, and 12. The obtained
results are compared with those given in the literature and a good
agreement has been found.