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P. Alfredsson, A. Johansson, J. Haritonidis, H. Eckelmann (1988)
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Experiments were carried out to study the effects of imperfect spatial resolution on turbulence measurements in the very near-wall region using hot wires of different lengths, l + (in wall units). Previous works have indicated that the distributions of the longitudinal velocity rms value, skewness and flatness factors are independent of l + in the buffer region and beyond provided l +<20–25. Our results obtained using l +=3, 6, and 22 in the viscous sublayer region show that generally the said distributions are dependent on l + and attentuate in magnitude with increasing l +. Further experiments were also carried out at different Reynolds numbers (Re c , based on centerline velocity and channel’s height) but with measurements made using hot wire of the same l +. The latter shows that the rms value and other higher order moments of longitudinal velocity fluctuations are independent of Re c , thereby extending similar findings by Johansson and Alfredsson (1983), valid in the buffer region into the viscous sublayer region.
Experiments in Fluids – Springer Journals
Published: Feb 14, 1997
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