Affiliations: Laboratoire des Ecoulements Géophysiques
et Industriels (LEGI), B.P. 53 X 38041 Grenoble, Cédex France.
E-mail: [email protected]
Abstract: The effect of blowing through a localized slot on the wall
turbulence dynamics and heat transfer process is analyzed by direct numerical
simulations in a fully developed turbulent channel flow. The severity parameter
is mild and there is no flow separation induced by the blowing. The shear
stress transport and temperature energy budget is discussed in detail. The wall
shear and flux decreases immediately downstream the slot in a similar manner
but the Reynolds analogy does not hold over the slot. The physical process is
governed by the production and pressure redistribution over the slot in a
complex manner. The turbulent transport and especially the advection play an
essential role in the heat transfer mechanism.
Keywords: Localized blowing, Control of Wall turbulence, Direct Numerical Simulations, Heat transfer