Heat (mass) transfer and friction loss in two-pass ducts with various parallel rib arrangements |
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Authors: | Kyung Min Kim Sei Young Lee Dong Hyun Lee Hyung Hee Cho |
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Institution: | (1) Department of Mechanical Engineering, Yonsei University, Seoul, 120-749, South Korea;(2) Mechanical Engineering Department, University of Texas at Austin, Austin, TX 78712, USA |
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Abstract: | The present study investigated the effects of four parallel rib arrangements on heat/mass transfer and pressure drop characteristics
in rotating two-pass ducts. The experiments of mass transfer and pressure measurement are performed to obtain heat transfer
distributions and friction losses. The highest averaged heat (mass) transfer and friction loss in each region appeared in
the turning region in the stationary cases, but appeared in the upstream region of the second pass in the rotating cases.
Among the tested rib arrangements, the averaged heat (mass) transfer and the friction factor in the second pass in the stationary
ducts were high in the cases with the NN- and PP-type ribs; however, in the rotating ducts, they were high in the cases with
the NN- and PN-type ribs. The thermal performance in the four different rib arrangements was almost the same. |
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