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jet impingement is one of the more effective solutions for cooling electronic devices, as it can create a very  high heat transfer rate on the impacting surface.  as the power density of modern chips keeps increasing, using fluid jets as a thermal management method shows great potential.  in most air jet cooled electronic systems, continuous jets are created by using fans, blowers or a high pressure air jet source. 

for the continuous jets, parameters such as jet configuration (free -surface jet, submerged jet or confined jet), the spacing between the jet outlet and the impingement surface, the magnitude of the jet velocities, the angle of impingement, etc. are major factors affecting the jets cooling performance. 

to enhance jet impingement heat transfer, a pulsed air jet impingement configuration was investigated by some researchers who are looking for exciting the coherent structures in the jet flow and breaking the boundary layer on the impingement plate.  however, creating pulsed jet impingement by traditional methods requires complicated mechanical design and flow routing arrangement.

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