High performance heat transfer ducts with parallel broken and V-shaped broken ribs
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The effect of the broken rib orientation on the local heat transfer distributions and pressure drop in a square channel with two opposite in-line ribbed walls is investigated for Reynolds numbers from 15 000 to 90 000. The square channel is composed of ten isolated copper sections and has a length-to-hydraulic diameter ratio of 20. The rib height-to-hydraulic diameter ratio is 0.0625, and the rib pitch-to-height ratio equals 10. The results show that the 60 parallel broken rib or 60 V-shaped broken rib provides a higher heat transfer augmentation than the 45 parallel broken rib or 45 V-shaped broken rib and, subsequently, higher than the 90 broken rib. The parallel 'broken rib' or V-shaped 'broken rib' has 2.5-4 times heat transfer augmentation compared with the previous parallel 'continuous rib' or V-shaped 'continuous rib' with 2-3 times heat transfer augmentation for the same amount of 7-8 times pressure drop penalty. 1992.
International Journal of Heat and Mass Transfer
author list (cited authors)
Han, J. C., & Zhang, Y. M.
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