ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
PROFILE ANALYSIS OF HEAT/MASS TRANSFER ACROSS THE PLANE WALL-JET
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.