Three-dimensional simulations of laminar separated and reattached flow and heat transfer over a blunt flat plate in a square channel are presented. Numerical calculations of Navier-Stokes equations and energy equation are carried out using the finite difference method. Results of three-dimensional calculation are compared with two-dimensional ones and effects of the side walls are described. It is clarified from the present results that the reattachment length increases with an increase of Reynolds number and the flow in the recirculation region becomes three-dimensional. The reattachment line is curved by the side wall effects. Two-dimensionality of the flow is reduced as Reynolds number increases. The horseshoe-vortex formed near the side walls has great effects upon the heat transfer in the redeveloping flow region. The separated shear layer around the center of plate becomes unstable with a further increase of Reynolds number and the vortices are periodically shed from the reattachment flow region. Such vortices exhibit a hairpin-like structure and greatly influence the heat transfer.
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Numerical Simulation of Laminar Flow and Heat Transfer Over a Blunt Flat Plate in Square Channel
Hideki Yanaoka, Research Associate,
Hideki Yanaoka, Research Associate
Department of Machine Intelligence and Systems Engineering, Tohoku University, Aramaki-Aoba 01, Aoba-ku, Sendai 980-8579, Japan
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Hiroyuki Yoshikawa,
Hiroyuki Yoshikawa
Department of Machine Intelligence and Systems Engineering, Tohoku University, Aramaki-Aoba 01, Aoba-ku, Sendai 980-8579, Japan
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Terukazu Ota, Professor
Terukazu Ota, Professor
Department of Machine Intelligence and Systems Engineering, Tohoku University, Aramaki-Aoba 01, Aoba-ku, Sendai 980-8579, Japan
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Hideki Yanaoka, Research Associate
Department of Machine Intelligence and Systems Engineering, Tohoku University, Aramaki-Aoba 01, Aoba-ku, Sendai 980-8579, Japan
Hiroyuki Yoshikawa
Department of Machine Intelligence and Systems Engineering, Tohoku University, Aramaki-Aoba 01, Aoba-ku, Sendai 980-8579, Japan
Terukazu Ota, Professor
Department of Machine Intelligence and Systems Engineering, Tohoku University, Aramaki-Aoba 01, Aoba-ku, Sendai 980-8579, Japan
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division November 15, 1999; revision received August 21, 2001. Associate Editor: R. Douglass.
J. Heat Transfer. Feb 2002, 124(1): 8-16 (9 pages)
Published Online: August 21, 2001
Article history
Received:
November 15, 1999
Revised:
August 21, 2001
Citation
Yanaoka, H., Yoshikawa, H., and Ota, T. (August 21, 2001). "Numerical Simulation of Laminar Flow and Heat Transfer Over a Blunt Flat Plate in Square Channel ." ASME. J. Heat Transfer. February 2002; 124(1): 8–16. https://doi.org/10.1115/1.1420715
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