A Study of Wall-Turbulence Phenomena Using Hot-Film Sensors

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Abstract
Flush-mounted hot-film sensors were used to study local turbulence-induced fluctuations in the rate of heat transfer in pipe flow of water for a Reynolds number range of 11,000 to 170,000. Determinations were made of power spectral density, characteristic frequency (obtained from the rate at which the signal crossed its zero level), amplitude density, and intensity of the heat-transfer fluctuations. Studies of the relationship between the heat-transfer fluctuations in the vicinity of the wall indicated that a significant correlation existed which systematically decreased as the anemometer was moved from moderate distances upstream to moderate distances downstream of the wall sensor. Evidences of a periodic component were observed in the autocorrelation curves of velocity fluctuations in the vicinity of the wall for a Reynolds number of 52,000. The period determined was of the same order of magnitude as that predicted by Einstein and Li [10]2 and Black [11] sublayer flow models.

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