The next speaker in our student seminar series will be Christina Vanderwel. Christina will be giving a talk titled “Measurements of the turbulent dispersion of a passive scalar plume in turbulent shear flow”.
Where: CBY B205
Date: Wednesday April 16th, 2014
The seminar of the talk is given below. Hope to see you all there!
Measurements of the turbulent dispersion of a passive scalar plume in turbulent shear flow
Candidate: Christina Vanderwel
Supervisor: Dr. Stavros Tavoularis
The dispersion of pollutants in oceanic and atmospheric flows is of significant interest in environmental applications, however, dispersion in such highly turbulent flows is still not well understood. The objective of this work is to further the understanding of turbulent dispersion by experimentally studying the turbulent dispersion of a plume of dye released in turbulent shear flow generated in the controlled environment of a laboratory water tunnel. Maps of the turbulent velocity and dye concentration were measured simultaneously using stereoscopic particle image velocimetry and planar laser-induced fluorescence. The results were compared with fundamental models of absolute and relative turbulent dispersion and, for the first time in an experimental flow, all components of the eddy diffusivity tensor were directly measured. We were also able to demonstrate that coherent vortices present in the turbulence are directly correlated with turbulent transport and are a dominant mechanism of the turbulent dispersion.