Abstract
Distributions of velocity and concentration of turbulent gas jets with various densities from helium to carbon dioxide against ambient air are measured by using particle image velocimetry and laser induced fluorescence methods. The turbulent transport of the jet fluid is directly investigated to analyzing the distributions of jet-fluid concentration and its vortex motion. The result shows that the self-similarity exists between profiles of scalar flux and Reynolds stress along the radial direction. Furthermore, several subgrid scale scalar-flux models for large eddy simulation are discussed. Based on the scattering plots of model values of subgrid scale scalar-flux against the measured values, the characteristics of each model are basically similar for every density conditions. Also, the Favre-averaged scale similarity model performs well for wide various densities.
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