Flow field of impinging sweeping jets


  • Gerardo Paolillo Università degli Studi di Napoli Federico II, Italy
  • Carlo Salvatore Greco Università degli Studi di Napoli Federico II, Italy
  • Gennaro Cardone Università degli Studi di Napoli Federico II, Italy
  • Tommaso Astarita Università degli Studi di Napoli Federico II, Italy




Sweeping jets are oscillating jets generated by fluidic oscillators, i.e., devices designed to produce an oscillation of the flow without the use of any moving parts (Raghu, 2013). A typical configuration of such devices consists of an expansion chamber connected to a high-pressure supply via a converging nozzle and provided with feedback channels. The oscillating motion in the expansion chamber is triggered by an inherent flow instability and sustained by the flow rate across the feedback channels. Recently, sweeping jets have been studied in flow control applications for noise reduction, separation and circulation control over airfoils, control of resonant cavity oscillations and deflection of jets. The advantageous features of fluidic actuators, among which are the wide range of operating frequencies (up to kHz with meso-scale) and the distributed momentum addition, have also stimulated an increasing interest in their application to electronics cooling. Several recent studies on the convective heat transfer from impinging sweeping jets (e.g., Hossain et al., 2018; Park et al., 2018) have shown that, compared to conventional round jets, they offer higher cooling rates with better uniformity at least for small jet-to-plate spacings.

Author Biography

Gerardo Paolillo, Università degli Studi di Napoli Federico II, Italy

Gerardo Paolillo received a Master's degree in Aerospace Engineering and a PhD degree in Industrial Engineering from Università di Napoli "Federico II" in 2015 and 2018, respectively. He is currently a Post-doctoral Fellow in the Department of Industrial Engineering at Università di Napoli "Federico II". His research interests lie in the area of experimental fluid mechanics, with focus on applications of unsteady jets to flow control and electronics cooling, investigation into dynamics of turbulent Rayleigh-Bènard convection and development of 3D optical velocimetry techniques.






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