An experimental study of the mixing of a jet into a cross flow using heat as a passive scalar

Spectral analysis results and conditional averages of various turbulent quantities are presented for various velocity ratios and Reynolds numbers. A unique conditional sampling technique has been used which separates contributions from the turbulent-jet flow, the irrotational jet-flow, the turbulent cross-flow and the irrotational cross-flow. The intermittency factor profiles indicate that irrotational cross-flow intrudes the pipe but does not contribute to the average turbulent quantities while the jet-pipe irrotational flow contributes significantly to them in the region above the exit where the interaction between the boundary layer eddies and those of the pipe starts to take place. Further downstream the contributions of the oncoming boundary layer eddies to the statistical average reduce significantly. The downstream development depends mainly on the relative eddy size of the interacting turbulent fields.