Effects of pulsation on the flow field of turbulent impinging jets

The current study examines the effect of pulsation on the flow field of turbulent impinging jets. Previous work identified significant differences in the transitional and turbulent jet responses to pulsation, and this study considers the effect of the Strouhal number on the structure of turbulent impinging jets. This is of particular interest due to the wide-spread use of jets (for instance, in heat and mass transfer applications), and there is an interest in the utilisation of pulsating jets as alternative to steady jets to increase heat and mass transfer rates. Preliminary findings suggest that in order to achieve improvements in heat and mass transfer rates, a turbulent jet is preferable to an equivalent transitional jet as their behaviour is easier to predict, and for a number of frequencies, they exhibit favourable flow conditions when compared to the equivalent steady jet case. The similariry in the observed turbulence characteristics between the steady and pulsating cases also suggests that a steady jet model could be a viable baseline for computational modelling of a turbulent pulsating jet.