Abonnement à la biblothèque: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

A CORRELATION FOR BOUNDARY LAYER HEAT TRANSFER ACCOUNTING FOR FREE STREAM TURBULENCE

Get access (open in a dialog) DOI: 10.1615/IHTC9.2580
pages 303-308

Résumé

This paper presents a new correlation for the heat transfer rate through a turbulent boundary layer as free stream turbulence varies from 0% to 65%. The correlation is based on the finding of Maciejewski and Moffat (1989) that for very high free stream turbulence the heat transfer coefficient is linearly related to the level of the turbulent fluctuations in the free stream. A new Stanton number, St', based on u'max, the maximum standard deviation in the streamwise velocity found in the wall affected region, is used to characterize turbulent boundary layer heat transfer. The correlation has the functional form St'=St'(Pr, Tu) and was developed using the experimental data of Maciejewski and Moffat (1989, flat plate, turbulent free jet), Vogel (1984, reattaching flow behind a backward facing step), Blair (1983, flat plate, grid turbulence), Pedisius et.al. (1983, flat plate, grid turbulence), Hollingsworth et.al. (1989, flat and concave surfaces, grid turbulence), and MacArthur (1986, flat plate, circular tangential wall jet). Despite the differences in flow geometry and Reynolds number found in these experiments, all these heat transfer data collapse onto a single correlation to within ± 15%. The correlation presented is restricted to Reθ ≥ 1000 and Pr ≥ 0.7.