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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Spatio-temporal measurements of convective heat transfer for a backward-facing step flow

page 12
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.2080
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ABSTRAKT

Spatio-temporal distribution of convective heat transfer behind a backward-facing step was measured in order to explore the mechanisms of the heat transfer caused by flow separation and reattachment. This measurement was achieved by using a high-speed infrared thermograph which measured temperature fluctuation on a thin foil heated electrically. The attenuation due to both the heat capacity and the lateral conduction of the foil was restored by solving heat conduction equations inside the test surface. As a result, it was clarified that the heat transfer enhancement in the flow reattaching region had a spot-like feature. The spots appeared and disappeared almost randomly but had some periodicity in time and spanwise direction. The spanwise wavelength of this structure was approximately 1.2 − 1.3 times the step height for Reynolds number of ReH > 2000, regardless of the step height. This wavelength corresponded well to that of streamwise vortices formed in the flow reattachment region, and thus, it is fairly certain that the heat transfer in the reattachment region is dominated by the behavior of the streamwise vortices.

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