ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
HEAT TRANSFER IN TURBULENT FLOWS
Sinopsis
This paper reviews recent progress in the turbulent
heat transfer under forced convection with
an emphasis on the new experimental findings useful
for future turbulence models. Among the models
currently existing, the Two-Equation models have
been well tested in many turbulent flows and evaluated
as a powerful tool for prediction. But to increase
the capability and universality, the models
still need further study and refinement by the comparison
with the experimental data. Hence this paper
contains a survey of the modeling of a wall effects
and also of the Reynolds stress and turbulent
heat flux equations. In contrast to the time-averaged
analysis, the knowledge on coherent structures
of turbulent boundary layers has been accumulated
in the last decade. They have been brought out
through advances in instrumentations with the aid
of computers. The flow visualizations played an
important role in improving our physical understanding
of complicated turbulent flow structures.
They are still a potent tool for reducing complex
flow process to simple pictures and for developing
a model of turbulence. This paper also integrates
some attempts of structural modeling to take into
account the coherent structures of turbulence.