In order to study the influence of a transverse jet on heat transfer performance of a flat plate

an experimental setup was built up.Different jet-to-cross flow ratios(0≤r≤6.69)were explored.The temperature distributions on the heated flat plate were measured to analyze the change trend of the convective heat transfer coefficient

aiming to reveal the physical mechanism of heat transfer enhancement by a transverse jet.The results show that

the heat transfer from the flat plate was enhanced by the transverse jet when the jet-to-cross flow ratio was relatively small(the enhancing heat transfer ratioΦreached 8.85%when r was 0.57).Increasing the jet-to-cross flow ratio resulted in lower enhancing heat transfer ratio(Φreached 5.14% when r was 1.12

andΦ was 2.34% when r was 2.23).Further increasing the jet-to-cross flow ratio will downgrade the heat transfer effect(Φ was-1.97% when r was 4.46).On the other hand

the location of the highest temperature point shifted to the downstream side

then shifted back to upstream side as the jet-to-cross flow ratio increased.