Measurement of turbulent flow upstream and downstream of a circular pipe bend
- Department of Engineering Mechanics and Energy, University of Tsukuba, Tsukuba 305-8573 (Japan)
We measured velocity distribution in cross sections of a fully developed turbulent pipe flow upstream and downstream of a 90 degree sign 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 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.
- OSTI ID:
- 22038943
- Journal Information:
- Physics of Fluids (1994), Vol. 24, Issue 4; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-6631
- Country of Publication:
- United States
- Language:
- English
Similar Records
LDA investigation of the flow development through rotating U-ducts
Crossed Beam Energy Transfer in the NIF ICF Target Design