Natural Convection From a Horizontal Cylinder—Turbulent Regime

[+] Author and Article Information
B. Farouk

Mechanical Engineering and Mechanics Department, Drexel University, Philadelphia, Penn. 19104

S. I. Güçeri

Mechanical and Aerospace Engineering Department, University of Delaware, Newark, Del. 19711

J. Heat Transfer 104(2), 228-235 (May 01, 1982) (8 pages) doi:10.1115/1.3245077 History: Received March 16, 1981; Online October 20, 2009


A two-equation model has been adopted in obtaining numerical solutions of turbulent natural convection from an isothermal horizontal circular cylinder. The k-ε model employed in this study characterizes turbulence through the kinetic energy and its volumetric rate of dissipation. The transport equations for these two variables, along with those for time-averaged stream function, vorticity, and temperature, form a closed set of five coupled partial differential equations. These equations are solved for the entire flow domain, without boundary layer approximations. Buoyancy effects on the turbulence structure are also accounted for. Results are presented for a Rayleigh number range of 5×107 to 1010 and the average Nusselt numbers are compared with existing correlations and limited available experimental data.

Copyright © 1982 by ASME
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