What is it about?
In our latest publication, we investigated the three-dimensional wake dynamics generated by a turbulent circular jet normally impinging on baseline, vertical-slit, and horizontal-slit circular cylinders using time-resolved particle image velocimetry (TR-PIV) in two orthogonal planes. Our main findings demonstrate that slit orientation acts as a dominant parameter governing wake development through passive momentum injection: the vertical slit introduces additional streamwise momentum into the near wake that suppresses shear-layer instability, reduces turbulent transport, and promotes rapid wake recovery with a predominantly single-mode frequency response. In contrast, the horizontal slit induces a passive blowing-suction interaction that enhances lateral and spanwise momentum redistribution, leading to complex three-dimensional mixing, quasi-periodic oscillations from multiple energetic modes, and substantially lower Strouhal numbers than canonical cylinder wakes due to continuous jet-induced momentum forcing.
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Photo by Dani Adkins on Unsplash
Why is it important?
Jet impingement onto circular cylinders is motivated by applications in thermal management, surface cooling, and flow control.
Perspectives
Future experiments combining time-resolved pressure measurements within the cavity with velocity measurements through the slit would be required to quantify this potential coupling and its influence on frequency selection.
Dr. Lorenzo Martínez-Suástegui
Instituto Politecnico Nacional
Read the Original
This page is a summary of: Three-dimensional wake dynamics of a normally impinging turbulent circular jet interacting with slitted circular cylinders, International Journal of Heat and Fluid Flow, December 2026, Elsevier,
DOI: 10.1016/j.ijheatfluidflow.2026.110740.
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