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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Numerical analysis of laminar and turbulent flow regimes in developing mixed convection

Get access (open in a dialog) DOI: 10.1615/IHTC12.3740
6 pages

Sinopsis

Mixed convection upward flow in a vertical uniformly heated tube has been studied numerically. The three dimensional elliptic conservation equations and the Launder & Sharma low Reynolds k-ε turbulent model were used to study developing flow for Re=1000 and Re=1500 over a wide range of Grashof numbers. The results show that for both these Reynolds numbers two transitions occur in the fully developed region: at a first critical Grashof number the flow changes from laminar to turbulent and then, at a second higher critical Grashof number the flow changes from turbulent to laminar. The axial evolution of the turbulent kinetic energy and of the Nusselt number as well as the fully developed axial velocity profiles are presented for different Re, Gr combinations.