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EFFECTS OF PRANDTL NUMBER ON CURVED WALL SHEAR FLOWS

Hirofumi Hattori
Information and Analysis Technologies Division, Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showaku, Nagoya 466-8555, JAPAN

Yasutaka Nagano
Nagoya Industrial Science Research Institute; Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Resumo

Direct numerical simulation (DNS) of fully-developed turbulent curved channel flows with heat transfer at various Prandtl numbers has been performed using the finite difference method, where we show how both curvature and Prandtl number affect velocity and thermal fields. In a curved channel flow, turbulence energy is transported from the concave wall side to the convex wall side by the action of pairs of streamwise vortices generated in the center of a channel by the curved effect. In a thermal field, however, temperature variance decreases on the concave wall side and increases on the convex wall side in the case of different wall temperature conditions. Moreover, a profile of the mean temperature becomes more and more asymmetric with increasing Prandtl numbers and curvature. The DNS for a channel of various curvatures with different Prandtl number flows indicates in detail the turbulent statistics and turbulent structures in both the velocity and thermal fields.