Computational study of mass and heat transport in a counterflowing turbulent round jet

• Round water jet flowing into a uniform counterflow water stream is investigated.
• Presence of a counterflow enhances heat and mass transport of the jet effluent.
• Concentration and temperature profiles are self-similar in the inner region.
• Temperature effect on the concentration decay is presented.

This paper investigates the aspect of a hydraulic round jet issuing into a uniform counterflow under a range of jet-to-current velocity ratios. The prediction of the centerline dilution of jet effluent at velocity ratios ranging from 3 to 15 is performed using the Reynolds Stress Model (RSM). The penetration length is determined by considering the 5% contour of the centerline concentration and compared with empirical relationships suggested by previous researches. A similarity analysis is conducted on the radial profiles of both mean concentration and temperature at successive streamwise stations. The heat transport between the jet fluid and the opposed stream is also investigated with emphasis on the temperature effect on characteristics of the concentration field.