Abo Bibliothek: Guest
Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

DETECTION OF THE LAMINAR SUPERLAYER FROM TPIV MEASUREMENTS IN A TURBULENT JET

pages 1-5
DOI: 10.1615/TSFP7.260
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ABSTRAKT

We study experimentally the entrainment mechanism in a turbulent round submerged liquid jet at Re = 3.5×103. This is an extension of several previous works. The main difference is that we detect the turbulent/non-turbulent interface directly from the vorticity. For that, we set up a careful experiment, zooming in at the fluctuating boundary of the jet. With the Tomographic Particle Image Velocimetry, we measure the full velocity gradient tensor in multiple points with a sufficient spacial resolution. We can identify the laminar superlayer and obtain conditional flow statistics relative to it. The results allow us to reexamine the assumptions validity used in previous experimental studies with conclusions derived from them.

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