Measurements of turbulent diffusion from a point source in uniformly sheared flow

Vanderwel, Christina and Tavoularis, Stavros (2013) Measurements of turbulent diffusion from a point source in uniformly sheared flow. 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, , Poitiers, France. 28 - 30 Aug 2013.

Record type: Conference or Workshop Item (Paper)

Abstract

Turbulent diffusion of a plume of fluorescent dye with a very high Schmidt number and released from a point source in uniformly sheared flow was investigated in a water tunnel using stereoscopic particle image velocimetry and planar laser-induced fluorescence. Cross-sectional maps of the mean concentration and all three components of the turbulent mass flux vector are presented. A first-order gradient transport model relating each component of the turbulent mass flux vector to all components of the mean concentration gradient was applied successfully and all components of the associated turbulent diffusivity tensor were determined. The measured apparent diffusivities were comparable to the corresponding diffusivities. Predictions of three theoretical models were found to be in partial qualitative agreement with the measured diffusivities.

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