Laminar‐turbulent transition for low Reynolds number mixed convection in a uniformly heated vertical tube
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 1 November 2002
Abstract
Upward mixed convection flow of air in a uniformly heated vertical tube was studied numerically using the three‐dimensional elliptic conservation equations and the Launder and Sharma low Reynolds number k–ε turbulence model. For Re=1,000 the fully developed flow field undergoes two transitions as the Grashof number increases: thus, this flow field is laminar for Gr<8×106, turbulent for 8×106<Gr<5×107 and again laminar for Gr>5×107. In the entry region, turbulent kinetic energy decays monotonically for Gr≤3×106 and Gr≥7.1×107. For Gr between these two values it initially increases from the imposed inlet condition and then decreases towards its calculated fully developed value. The mean velocity profiles as well as the axial evolution of the skin friction coefficient are presented for representative values of Gr.
Keywords
Citation
Behzadmehr, A., Galanis, N. and Laneville, A. (2002), "Laminar‐turbulent transition for low Reynolds number mixed convection in a uniformly heated vertical tube", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 12 No. 7, pp. 839-854. https://doi.org/10.1108/09615530210443052
Publisher
:MCB UP Ltd
Copyright © 2002, MCB UP Limited