EXPERIMENTAL-STUDY ON THE MIXING OF ONE-LINE AND DUAL-LINE HEATED JETS WITH A COLD CROSS-FLOW IN A CONFINED CHANNEL

An experimental study is presented for the mixing of one- and dual-line heated jets injected normally into a cold crossflow in a rectangular channel. Measurements of the mean temperature, velocity, and turbulence intensity together with the flow visualization were performed. Self-similar forms for the dimensionless vertical temperature profiles were found. Parametric variations characterizing the mixing processes of the temperature and velocity fields were examined and correlated in terms of the momentum flux ratio and downstream distance. Results show that both the thermal and velocity penetration depths increase with increasing momentum flux ratio and downstream distance. The turbulence intensity is strong within the region of jet half-width, and the maximum value occurs at a point close to the jet velocity trajectory.