Effects of the stroke length and nozzle-to-plate distance on synthetic jet impingement heat transfer

•At high L0/Ds, Nu distribution is similar to that of a continuous impinging jet.•Maximum stagnation Nusselt number is attained at lower H/Ds as L0/D decreases.•Inner ring-shaped regions of maximum Nu are due to the trailing jet.•Outer ring-shaped regions of maximum Nu are due to vortex rings.•Nu fl...

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