The present study investigates the effects of bleed flow on heat/mass transfer and pressure drop in a rotating channel with transverse rib turbulators. The hydraulic diameter of the square channel is . 20 bleed holes are midway between the rib turburators on the leading surface and the hole diameter is . The square rib turbulators are installed on both leading and trailing surfaces. The rib-to-rib pitch is 10.0 times of the rib height and the rib height-to-hydraulic diameter ratio is 0.055. The tests were conducted at various rotation numbers (0, 0.2, 0.4), while the Reynolds number and the rate of bleed flow to main flow were fixed at 10,000 and 10%, respectively. A naphthalene sublimation method was employed to determine the detailed local heat transfer coefficients using the heat/mass transfer analogy. The results suggest that for a rotating ribbed passage with the bleed flow of , the heat/mass transfer on the leading surface is dominantly affected by rib turbulators and the secondary flow induced by rotation rather than bleed flow. The heat/mass transfer on the trailing surface decreases due to the diminution of main flow. The results also show that the friction factor decreases with bleed flow.
Effects of Bleed Flow on Heat/Mass Transfer in a Rotating Rib-Roughened Channel
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Jeon, Y. H., Park, S. H., Kim, K. M., Lee, D. H., and Cho, H. H. (July 25, 2006). "Effects of Bleed Flow on Heat/Mass Transfer in a Rotating Rib-Roughened Channel." ASME. J. Turbomach. July 2007; 129(3): 636–642. https://doi.org/10.1115/1.2720495
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