9600+ Pulse Generator Featured in New Research Paper by Tsukuba Japan
Quantum Composers is proud to share the new research from the University of Tsukuba, Japan featuring the 9600+ series Digital Delay Pulse Generator. The instrument was used by the department of engineering and mechanics in a particle image Velocimetry system for the synchronization of the various instruments.
Measurement of Turbulent Flow Upstream and Downstream of a Bend in a Round Pipe
Jun Sakakibara1, Nobuteru Machida1
Department of Engineering Mechanics and Energy, University of Tsukuba, Tsukuba, Japan
Abstract We measured velocity distribution in cross sections of a fully developed turbulent pipe flow upstream and downstream of a 90-degree bend by synchronizing two sets of a particle image velocimetry (PIV) system. Unsteady undulation of Dean vortices formed downstream from the bend was characterized by the azimuthal position of the stagnation point found on the inner and outer sides of the bend. Linear stochastic estimation (LSE) was applied to capture the upstream flow field conditioned by the azimuthal
location of the stagnation point downstream from the bend. When the inner-side stagnation point stayed below (above) the symmetry plane, the conditional streamwise velocity upstream from the bend exhibited high-speed streaks extended in a quasi-streamwise direction on the outer side of the curvature above (below) the symmetry plane.