Author(s): Giselher Gust; Theo Loy

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Abstract: Friction velocity vector probes have been designed for two-dimensional fluid flow based on a flush-mounted hot film operated in constant temperature mode. The magnitude of , was obtained with steady-state calibration curves in the reversing (separating) flow tested. The direction is determined from the result of an anti-coincidence correlation program with forward-backward discrimination of the thermal wake. Probe performance is evaluated for flow in an open channel with a submerged block at Re = 11,000 by measuring time-averaged vector values (x) in the longitudinal centerline. The reattachment position was found at x/h = 7.0. From the energy gradient of the channel flow and integration of the friction velocities along the transect the C D value of the block with a length/height ratio of 3.57 is found to be 3.1.

DOI: https://doi.org/10.1080/00221688909499168

Year: 1989