Combined Forced and Free Convection in the Entrance Region of an Isothermally Heated Horizontal Pipe

[+] Author and Article Information
Mikio Hishida, Yasutaka Nagano

Department of Mechanical Engineering, Nagoya Institute of Technology, Showa-ku, Nagoya, Japan

M. S. Montesclaros

Cebu Institute of Technology, Cebu, Philippines

J. Heat Transfer 104(1), 153-159 (Feb 01, 1982) (7 pages) doi:10.1115/1.3245043 History: Received March 09, 1981; Online October 20, 2009


Numerical solutions are given without the aid of a large Prandtl number assumption for combined forced and free laminar convection in the entrance region of a horizontal pipe with uniform wall temperature. The steady-state solutions have been obtained from the asymptotic time solutions of the time-dependent equations of momentum and energy with the Poisson equation for pressure. Results are presented for the developing primary and secondary velocity profiles, developing temperature fields, local wall shear stress, and local and average Nusselt numbers, which reveal how the developing flow and heat transfer in the entrance region are affected by the secondary flow due to buoyancy forces.

Copyright © 1982 by ASME
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