Turbulent mass and momentum transport of a circular offset dense jet

Turbulence characteristics of a circular dense jet offset by a small distance from a parallel horizontal boundary have been studied using the combined particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) method. The cross-sectional profiles of the turbulence intensity, Reynolds shear stress and Reynolds flux reveal the characteristics of the flow transition from a dense-jet regime to a wall-dense-jet regime. In the dense-jet regime, the profiles at different downstream locations collapse after normalization, and the turbulent. Self-similarity has not been reached in the covered transitional regime. Turbulent mass and momentum transport are found to be weaker than in the unbounded vertical buoyant jet, but are growing with the transition to the wall jet. In the transitional regime, the turbulence characteristics grow stronger but self-similarity was not observed. The associated turbulent viscosity, ν t , turbulent diffusivity, D t as well as the turbulent Schmidt number, Sc t , have been derived from the presented experimental data.