Experimental investigation on flow resistance through cross-flow over tube bundles with high air speed

In order to use air/air tube heat exchanger in bypass of aero-engine in which air flow speed was very high, experiments were carried out to determine the flow resistance characteristics of the cross-flow through elliptical and circular tube bundles under the condition of high air flow speed. The compression effect was included. It shows that with the same geometrical arrangements, the flow resistance coefficients of two kinds of bundles show relatively similar trends with the increasing of Reynolds number. However, the coefficient of flow resistance over the elliptical tube bundles is remarkably lower than that of circular bundles.