Mean-speed measurements in two-dimensional, incompressible, fully-developed turbulent channel flow

TL;DRAbstract

Mean velocity profiles were measured in the 5” x 60” wind channel of the turbulence laboratory at the GALCIT, by the use of a hot-wire anemometer. The repeatability of results was established, and the accuracy of the instrumentation estimated. Scatter of experimental results is a little, if any, beyond this limit, although some effects might be expected to arise from variations in atmospheric humidity, no account of this factor having been taken in the present work. Also, slight unsteadiness in flow conditions will be responsible for some scatter. Irregularities of a hot-wire in close proximity to a solid boundary at low speeds were observed, as have already been found by others. That Kármán’s logarithmic law holds reasonably well over the main part of a fully developed turbulent flow was checked, the equation u/ut = 6.0 + 6.25 log10 yut/v being obtained, and, as has been previously the case, the experimental points do not quite form one straight line in the region where viscosity effe

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