Developing heat transfer in rectangular channels with rib turbulators Academic Article

The combined effects of the rib angle-of-attack and the channel aspect ratio on the distributions of the local heat transfer coefficient for developing flow in short rectangular channels (L/D = 10 and 15) with a pair of opposite rib-roughened walls were determined for Reynolds numbers from 10 000 to 60 000. The rib angle-of-attack was varied from 90 to 60, to 45, and to 30, whereas the corresponding channel width-to-height ratio was varied from 1 to 2 and to 4, respectively. Semi-empirical heat transfer and friction correlations were obtained to account for rib angle, rib spacing, channel aspect ratio, rib height and Reynolds number. The results can be used in the design of turbine blade cooling channels. 1988.

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