Flow structure between the tubes and heat transfer of a tube bundle in pulsating flow

Experimental results on the flow structure and heat transfer of the pulsating cross-flow past the in-line and staggered tube bundles have been obtained. The effect of forced flow pulsations on the statistical characteristics of flow in the gap between the inner-row tubes was analyzed for different pitch values. Average heat transfer in steady and pulsating flow past the bundle has been measured. Correlation between heat transfer and the variation of flow pattern in the gap between the tubes has been determined. The opportunity to enhance heat transfer in the tube bundle by forced freestream pulsations has been shown.