LOW REYNOLDS NUMBER TURBULENT BOUNDARY LAYERS ON A SMOOTH FLAT SURFACE IN A ZERO PRESSURE GRADIENT.

L. P. Erm, Alexander Smits, P. N. Joubert

Research output: Contribution to conferencePaper

10 Scopus citations

Abstract

An experimental investigation of low Reynolds number turbulent boundary layers (R// theta less than 5000) on a smooth flat surface in a nominally zero pressure gradient is described. Stimulator pins of three different heights were used to trip the boundary layer. Mean flow velocity profile measurements were analysed using the method of Coles. This method involved fitting the data to a log-law line having constants kappa equals 0. 41 and C equals 5. 0 and inferring values of E and u// tau . Acceptable low Reynolds number turbulent boundary layers were shown to exist. Broadband turbulence and spectral measurements for R// theta equals 5010, the highest Reynolds number obtainable in these experiments, were compared, where possible, with other data and the agreement was good. Both mean flow and turbulence results were shown to be dependent on Reynolds number and apparently dependent on the size of the tripping device.

Original languageEnglish (US)
StatePublished - Dec 1 1985

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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