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International Heat Transfer Conference 6

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

A PREDICTION PROCEDURE FOR FULLY DEVELOPED TURBULENT FLOW AND HEAT TRANSFER IN TUBE BANKS

T. H. Massey
Central Electricity Research Laboratories Leatherhead, Surrey, England

J. A. Hitchcock
Central Electricity Research Laboratories, Kelvin Avenue, Leatherhead, Surrey, England

Brian E. Launder
School of Mechanical, Aerospace & Civil Engineering, The University of Manchester, PO Box 88, Manchester M60 1QD, UK

DOI: 10.1615/IHTC6.1680
pages 261-266

Résumé

A prediction procedure for the pressure drop and heat transfer characteristics of tube banks during turbulent flow has been developed. The Navier-Stokes and energy equations for fully developed, steady, uniform property flows are solved by finite difference techniques. Examples of the procedure are given for several geometries and Reynolds numbers up to 106.
The finite difference solution procedure was executed upon a grid of nodes which accurately mapped a symmetry unit of the bank. To achieve this accurate coverage with awkward boundaries a grid which combined polar and cartesian sections was developed. The fully developed nature of the flow was modelled by using periodic boundary conditions.
A two equation model of turbulence, solving equations for the kinetic energy of turbulence, and its dissipation, was used. For the pre-transition Reynolds number regime in tube banks, where the boundary layer remains laminar until separation, despite the turbulent free stream, the fully turbulent form of this model was found to be unsatisfactory. To overcome this a modified form was developed which simulates the existence of a laminar boundary layer. Predictions were obtained using the two forms of the model in an overlapping mode.

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