Abstract
In order to measure the local wall friction force exerted by a skewed turbulent boundary layer on a smooth surface, an improved Preston tube has been developed. A semi-circular shroud is applied to a conventional Preston tube to make it insensitive to direction of flow, just like a Kiel total-pressure probe. The improved Preston tube is used to measure the wall friction force on the flat end wall of a curved channel with 180 degree turning angle, and the results are compared with those deduced from the Clauser chart method.
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