The present study is concerned with the flow and heat transfer for turbulent flow in the developing region for ribbed duct The study is based on both experimental and numerical simulations of intercooling passages of blade turbine with three different intake shapes. The effects of the different investigated parameters (Reynolds number, rib pitch, and intake shape) on the friction factor, local temperature, and local heat transfer coefficient are studied. A commercial ANSYS code [1] based on a finite element technique is used to support the experimental results. The experiments are carried out by using a wind tunnel with a suction blower and a roughened rectangular duct. It was found that the Nusselt number ratio was larger for abrupt and plenum box compared with that for bellmouth near the contraction inlet. This is due to the effect of the high turbulence at the sudden contraction inlet. The effect of intake shape on heat transfer coefficient for ribbed duct was significant for the case of rib pitch to height ratio of 20 more than that in the case of 10. Correlations were obtained for the average Nusselt number ratio in the developing region of the test duct for different intake shapes.
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