Numerical simulations of laminar stagnation-region heat transfer in the presence of freestream disturbances are performed. The sensitivity of heat transfer in stagnation-region to freestream vorticity is scrutinized by varying the length scale, amplitude, and Reynolds number. As an organized inflow disturbance, a spanwise sinusoidal variation is superimposed on the velocity component normal to the wall. An accurate numerical scheme is employed to integrate the compressible Navier-Stokes equations and energy equation. The main emphasis is placed on the length scale of laminar inflow disturbances, which maximizes the heat transfer enhancement. Computational results are presented to disclose the detailed behavior of streamwise vortices. Three regimes of the behavior are found depending on the length scale: these are the “damping,” “attached amplifying,” and “detached amplifying” regimes, respectively. The simulation data are analyzed with an experimental correlation. It is found that the present laminar results follow a general trend of the correlation. [S0022-1481(00)01102-6]
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Influence of Inflow Disturbances on Stagnation-Region Heat Transfer
S. Bae,
S. Bae
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
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S. K. Lele,
S. K. Lele
Department of Mechanical Engineering, Stanford University, Stanford, CA 94309
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H. J. Sung
H. J. Sung
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
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S. Bae
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
S. K. Lele
Department of Mechanical Engineering, Stanford University, Stanford, CA 94309
H. J. Sung
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division, February 27, 1999; revision received, November 29, 1999. Associate Technical Editor: R. Douglass.
J. Heat Transfer. May 2000, 122(2): 258-265 (8 pages)
Published Online: November 29, 1999
Article history
Received:
February 27, 1999
Revised:
November 29, 1999
Citation
Bae, S., Lele, S. K., and Sung, H. J. (November 29, 1999). "Influence of Inflow Disturbances on Stagnation-Region Heat Transfer ." ASME. J. Heat Transfer. May 2000; 122(2): 258–265. https://doi.org/10.1115/1.521486
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