A New Correlation for the Penetration Length of Plane Turbulent Wall Jets

Studying wall jets can provide further understanding of the fundamental nature of the flow, leading to improvements in the various practical applications such as heating and film cooling, drag reduction, momentum and mass transfer, etc. Although considerable research has been done on wall jets in past years, there is still little information about the penetration length of these jets. In the present work, the wall jet half-penetration length is defined and a new correlation for the prediction of this parameter is suggested using curve-fits to the computational fluid dynamics (CFD) results. CFD results are validated against the available experimental data and reasonable agreement is observed. By the use of dimensional analysis dimensionless groups influencing the jet penetration are determined. CFD simulations are then made to find out how these dimensionless groups affect the wall jet penetration. The new correlation predictions are in very good agreement with the CFD results and the maximum deviation is only 1.4%.

کلیدواژه ها:

Plane wall jet ، penetration length ، curve-fit ، velocity decay ، CFD