Description: Bubble-turbulence interaction in a two dimension free shear layer is analyzed experimentally, investigating the influence of the large coherent structures present in the mixing region. A dilute, dispersed system of micro-bubbles is added to one side of a horizontal two stream water tunnel. Phase Doppler anemometry and other optical flow diagnostics were used to provide size and velocity information which was conditionally averaged with respect to the Kelvin-Helmholtz rollers in the shear layer. Measurement of the kinetic energy budget associated with these large scales of the underlying flowfield show it to be significantly inhomogeneous (ranging from KE generation to destruction) near the region of maximum velocity RMS. Issues associated with the use of optical flow diagnostics applied to such a flowfield are discussed.
Date: December 1, 1995
Creator: Rightley, P.M. & Lasheras, J.C.
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