EXPERIMENTAL DETERMINATION OF THE TURBULENT PRANDTL NUMBER IN A DEVELOPING TEMPERATURE BOUNDARY LAYER

1 January 1970

proceedings article
Published by Begell House

p. 1-11
https://doi.org/10.1615/ihtc4.1900

Abstract

Measurements of Pr_t were performed at five stations in a turbulent temperature boundary layer developing along a flat plate with a stepwise wall-temperature variation. The Pr_t values were calculated from the measured mean quantities as well as from the direct measurements of uv and vθ. The results agree reasonably well. A variation of Pr _t across the boundary layer is found, clearly showing the invalidity of the usually assumed Reynolds analogy (Pr_t = 1). For a developing temperature boundary layer it is impossible, except very close to the wall (y⁺ < 30), to indicate a universal Pr_t profile, which throws some doubt on the usefulness of Pr_t as a parameter to describe turbulent heat transfer.

Keywords

This publication has 0 references indexed in Scilit: