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Role of the Sub-Kolmogorov Scales in the Near-Wall Turbulent Passive Scalar Transfer at High Prandtl Numbers

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.620
pages 327-330

Iztok Tiselj
Reactor Engineering Division, Institut Jozef Stefan, Slovenia


Role of the sub-Kolmogorov scales in high Prandtl number fluids is analyzed in the turbulent channel and flume flow. Temperature is assumed to be a passive scalar at Prandl numbers 100 and 200 and friction Reynolds numbers 150 and 395. Velocity field is resolved with DNS accuracy, while the temperature field is treated with LES-like approach. The present results confirm conclusions of the previous studies of Campbell and Hanratty [AIChE J. 29, 215 (1983)] and Calmet and Magnaudet [Phys. Fluids 9, 438 (1997)] and show that the near-wall heat transfer is governed by the large scale near-wall structures. Namely, the results point to the very negligible role of the sub-Kolmogorov temperature scales.

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