Numerical and experimental investigation of impinging turbulent flow of twin jets against a wall

In the present study, impinging of vertical twin jet against a horizontal plate is investigated numerically and experimentally. Four two-equation RANS based turbulence models are used and their capabilities to simulate such complicated turbulent flow are examined. The inlet jet hydraulic diameters are the same, and the Reynolds number of external flows of jets is 13500. The ratio of the width of nozzles (e) to nozzle-to-plate distance (H) is considered as 1:10. The obtained results were compared with each other and two-dimensional experimental data to evaluate the capabilities of such models for this kind of flows. By comparing the numerical and experimental results, it was concluded that all of the models could predict acceptable results in the free jet area; however, in the near wall region, none of the models can predict flow characteristics with reasonable accuracy. According to the observations, at low nozzle-to-plate distances, the results of the turbulence models were approximately in accordance with the experimental data. Furthermore, maximum and minimum of the turbulent kinetic energy occurred in the shear layers and potential cores of the jets, respectively. (C) 2019 Sharif University of Technology. All rights reserved.