An Experimental Study of Heated Circular and Rectangular Jets Emitting into a Crossflow

Thermocouple measurements are performed in the spanwise–wall-normal plane at four measurement locations downstream of raised circular and rectangular stacks with the latter oriented with its major axis aligned both parallel and perpendicular to the crossflow. Exit velocity at the jet centerline is 50 m/s, exit temperature is either 425 K or 600 K, and the crossflow velocity is 10 m/s or 30 m/s. This parameter space yields blowing ratios in the range 0.89–4.14. The thermal centroid is used to characterize the plume trajectory and the spreading of the jet is determined based on a threshold temperature. The plume trajectory using this definition does not collapse cleanly to a common curve as in published studies of isothermal jets in crossflow wherein plume trajectory is defined using the velocity field, though the range of blowing ratios investigated here is relatively low compared to many other studies for which this scaling breaks down for blowing ratios less than about 4. The downstream spreading of the plumes, quantified by the core heated area versus downstream distance, shows consistent power-law behavior regardless of geometry, orientation and initial velocity and temperature conditions.