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Spatio-Temporal Characteristics of Heat Transfer for a Backward-Facing Step Flow

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2320
pages 2258-2268

Hajime Nakamura
Department of Mechanical Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa, 239-8686, Japan

S. Takaki
Graduate School of Science and Engineering, National Defense Academy, Yokosuka, Kanagawa, 239-8686, Japan

Shunsuke Yamada
Department of Mechanical Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan

Sinopsis

Spatio-temporal characteristic of heat transfer accompanied by the flow separation and reattachment was investigated using a high-speed infrared thermograph that recorded the temperature fluctuation on a heated thin-foil. In the flow reattaching region behind a backward-facing step, there appeared spot-like feature in the heat transfer, which was likely to be reflected by the spot-like flow reattachment. Many spots of high heat transfer appeared in the reattaching region almost randomly with time and space, which moved with the flow while spreading, and then overlapped with others to form a complex feature in terms of spatio-temporal characteristics. The instantaneous distribution of the heat transfer around the reattaching region had a typical spanwise wavelength of approximately the step height. In contrast, the characteristic fluctuating frequency of the local heat transfer, at which the fluctuating energy was most concentrated, was likely to be formulated by the Strouhal number based on the momentum thickness upstream of the step.

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