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NEAR-WALL HOT-WIRE MEASUREMENTS: CONVECTIVE VELOCITY AND SPECTRA IN THE VISCOUS SUBLAYER

Y. T. Chew
Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260

B. C. Khoo
Department of Mechanical Engineering National University of Singapore, Singapore 117576

C. J. Teo
Department of Mechanical & Production Engineering National University of Singapore Kent Ridge, Singapore 119260

要約

The convective velocity Uc of streamwise velocity fluctuations in the very near-wall region was obtained using a two-point correlation technique. It was found that in the viscous sublayer, Uc is approximately 13uτ and 15uτ respectively for the channel and boundary layer flows under investigation. Spectra data for the wall shear stress and streamwise velocity fluctuations in the viscous sublayer are also presented, and the normalized spectral plots for different flow conditions collapse at high frequencies or wavenumbers, thus indicating the possible presence of small scale universality at different Reynolds numbers even within the viscous sublayer.