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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

PROFILE ANALYSIS OF HEAT/MASS TRANSFER ACROSS THE PLANE WALL-JET

Get access (open in a dialog) DOI: 10.1615/IHTC7.1960
pages 349-355

Abstract

temperature profile extending from the wall to the free edge of a heated (or cooled) turbulent plane wall-jet in 'stagnant' surroundings is derived. This is obtained by coupling the thermal analogue of Spalding's inner layer formula with a quartic for the 'wake component'. The coefficients of the quartic wake function are derived from the wall-jet boundary conditions, which correspond to equal, uniform wall and free edge temperatures. An 'optimum log-law' for heat transfer is also derived, in the form of a complicated relation for the Reynolds analogy factor, by transforming the profile expression at it's maxima. The analysis is valid for heat transfer at small temperature differences and over two orders of magnitude of the Prandtl number. It is shown to be insensitive to the choice of the flow-specific parameters adopted. Analogous formulae for mass transfer at small concentrations may be readily obtained.