An experimental investigation was conducted to assess the heat transfer and pressure drop distribution of a two-pass channel with a round turn.The Reynolds numbers investigated varied from 30000 to 55000.This demonstrates that the secondary flow induced by ribs is the main factor to enhance the heat transfer before turn region.Under different Reynolds numbers

the trend of heat transfer and pressure drop distribution in the duct is consistent.However

the heat transfer in the after turn region is different.Moreover

the largest pressure drop occurs in the turn region.As the Reynolds number increases

the loss coefficient of the turn and the whole duct will decrease.Compared with two-pass channel with a sharp turn

the heat transfer in the turn region and after turn region in this study is lower

because the acceleration effect in the round turn region is not as strong as that in sharp turn.