A facility for PIV measurements of water hammer in pipe flow
Gosse Oldenziel (Deltares, TU Delft - Fluid Mechanics)
Francois Clemens (Norwegian University of Science and Technology (NTNU))
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Abstract
We present a facility for measurements of transient flow behavior due to rapid valve closure at initial Reynolds numbers up to Re τ = 1237. The facility allows the deployment of non-intrusive laser based diagnostic techniques such as Particle Image Velocimetry, Stereo Particle Image Velocimetry and Laser Doppler Anemometry. Steady state planar PIV and pressure drop measurements have been performed as well as planar PIV and absolute pressure measurements of the flow following rapid valve closure. The steady state measurements indicate that a clear logarithmic layer is present for the measured conditions at Re τ > 344 with a von-Kármán constant of k = 0.40. Resulting velocity and vorticity fields for an example transient case show the rich flow physics, including generation and advection of vorticity.