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Journal of Applied Mechanics and Technical Physics

2017 year, number 2

Effect of Surface Permeability on the Structure of a Separated Turbulent Flow and Heat Transfer behind a Backward-Facing Step

V. V. Terekhov, V. I. Terekhov
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
Keywords: турбулентный поток, теплообмен, отрывное течение, обратный уступ, пористая стенка, вдув, отсос, теплообмен, turbulent flow, heat transfer, separated flow, backward-facing step, porous wall, injection, suction, heat transfer

Abstract

The structure and heat transfer in a turbulent separated flow in a suddenly expanding channel with injection (suction) through a porous wall are numerically simulated with the use of two-dimensional averaged Navier-Stokes equations, energy equations, and v2-f turbulence model. It is shown that enhancement of the intensity of the transverse mass flux on the wall reduces the separation region length in the case of suction and increases the separation region length in the case of injection up to boundary layer displacement. The maximum heat transfer coefficient as a function of permeability is accurately described by the asymptotic theory of a turbulent boundary layer.