Correlations for Laminar Mixed Convection Flows on Vertical, Inclined, and Horizontal Flat Plates

[+] Author and Article Information
T. S. Chen, B. F. Armaly, N. Ramachandran

Department of Mechanical and Aerospace Engineering, University of Missouri—Rolla, Rolla, MO 65401

J. Heat Transfer 108(4), 835-840 (Nov 01, 1986) (6 pages) doi:10.1115/1.3247020 History: Received August 01, 1985; Online October 20, 2009


Local Nusselt numbers for laminar mixed convection flows along isothermal vertical, inclined, and horizontal flat plates are presented for the entire mixed convection regime for a wide range of Prandtl numbers, 0.1 ≤ Pr ≤ 100. Simple correlation equations for the local and average mixed convection Nusselt numbers are developed, which are found to agree well with the numerically predicted values and available experimental data for both buoyancy assisting and opposing flow conditions. The threshold values of significant buoyancy effects on forced convection and forced flow effects on free convection, as well as the maximum increase in the local mixed convection Nusselt number from the respective pure convection limits, are also presented for all flow configurations. It is found that the buoyancy or forced flow effect can increase the surface heat transfer rate from pure forced or pure free convection by about 20 percent.

Copyright © 1986 by ASME
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