The Direct Numerical Simulation (DNS) of the fully developed velocity and temperature fields in the two-dimensional turbulent channel flow coupled with the unsteady conduction in the heated walls was carried out. Simulations were performed at constant friction Reynolds number 150 and Prandtl numbers between 0.71 and 7 considering the fluid temperature as a passive scalar. The obtained statistical quantities like root-mean-square temperature fluctuations and turbulent heat fluxes were verified with existing DNS studies obtained with ideal thermal boundary conditions. Results of the present study were compared to the findings of Polyakov (1974), who made a similar study with linearization of the fluid equations in the viscous sublayer that allowed analytical approach and results of Kasagi et al. (1989), who performed similar calculation with deterministic near-wall turbulence model and numerical approach. The present DNS results pointed to the main weakness of the previous studies, which underestimated the values of the wall temperature fluctuations for the limiting cases of the ideal-isoflux boundary conditions. With the results of the present DNS it can be decided, which behavior has to be expected in a real fluid-solid system and which one of the limiting boundary conditions is valid for calculation, or whether more expensive conjugate heat transfer calculation is required.
DNS of Turbulent Heat Transfer in Channel Flow With Heat Conduction in the Solid Wall
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division September 9, 2000; revision received March 16, 2001. Associate Editor: D. Poulikakos.
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Tiselj, I., Bergant, R., Mavko, B., Bajsic´, I., and Hetsroni, G. (March 16, 2001). "DNS of Turbulent Heat Transfer in Channel Flow With Heat Conduction in the Solid Wall ." ASME. J. Heat Transfer. October 2001; 123(5): 849–857. https://doi.org/10.1115/1.1389060
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