The flow behavior of a jet impinging on a ribbed surface has an obvious effect on the impingement heat transfer. It has been observed experimentally in a special smoke wind tunnel with rectangular section. This is an interesting problem in the impingement cooling midchord region of the gas turbine aerofoils with ribbed surface, and also in the electronic component cooling. The effect of the structural parameters, such as rib height (e), pitch-to-height ratio (p/e), nondimensional jet-to-surface spacing (Z/d) and the relative position of the jet hole to the ribs etc., and the crossflow rate on the flow behavior have been investigated by the flow visualization on a variety of configuration models. The experimental results reveal the mechanism of flow behavior and explain the flow and heat transfer characteristics of the impingement cooling from ribbed surface with crossflow.

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