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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i1-3.250
pages 285-294

Mixed Convection in a Rectangular Duct Heated from below

Uichiro Narusawa
Department of Mechanical, Industrial & Manufacturing Engineering, Northeastern University, Boston, MA 02115, USA

SINOPSIS

A thermally-developing nitrogen gas flow at the entrance region of a rectangular duct is studied numerically when the bottom is heated isothermally with adiabatic sidewalls. Flow patterns are analyzed over a range of a Rayleigh number, in which steady convective rolls are induced by buoyancy. Effects of buoyancy on heat transfer are also examined for ducts with the aspect ratio of 2-6. Both the Nusselt number and the entrance length for full development of mixed convection are shown to exhibit irregular variations as the number of longitudinal rolls changes with the aspect ratio.


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