Abstract
Round jets impinging at multiple impingement angles were considered for this study to gain better understanding of the parameters affecting resultant jet growth and velocity distribution. Work done by the authors previously on single jet has helped to establish that the SST (Shear Stress Transport) k-ω model is the ideal turbulence model for predicting flow characteristics of jets exiting a fully developed pipe at low Reynolds number. Hence, for the study of impinging jets, SST k-ω turbulence model was used to study the velocity and jet growth characteristics. Based on the mesh obtained from the grid sensitivity study, jets impinging at 30, 45 and 60 degrees at Reynolds number of 7500 were numerically analyzed. It was observed that the profile of the resultant jet closely matched with the prediction of elliptical profile predicted by past researchers. In addition, it was seen that higher jet growth was predicted in the case of jets impinging at a higher impingement angle.
Highlights
Impinging jets have many industrial applications since they can enhance fluid mixing and increasing the spread rate of the resultant jet
From the current study of jet impingement at multiple angle and constant Reynolds number, it was concluded that the SST k-ω model can predict velocity characteristics of impinging jets with reasonable accuracy
While generating the mesh for the current study, it was noted that false diffusion will play an important aspect in the analysis since the flow direction vectors is at an angle to the mesh elements
Summary
Impinging jets have many industrial applications since they can enhance fluid mixing and increasing the spread rate of the resultant jet. Rajaratnam and Khan [10] studied impinging jets at four different angles (30, 60, 90 and 120 degrees) at Reynolds number of 30,000 They established the physics of the flow based on two regions: a zone from nozzle exit to impingement point and a zone beyond impingement point. Rajaratnam and Wu [11] performed ab experimental study on impinging jets at 60-degree angle with unequal momentum They considered incompressible flows with different velocities exiting each nozzle. They observed that the near field flow physics was strongly dependent on the impingement angle, and that the resultant flow field downstream of combining point resembled elliptic profile They observed the axis-switching characteristics, which is considered a phenomenon closely associated with non-circular jets. It was considered very significant to establish one of the initial works on impinging jets at low Reynolds number involving both computational and experimental analysis
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