Abstract
The local heat transfer of developed turbulent flows in the stationary ribbed divergent rectangular channels has been experimentally checked out. The rectangular divergent channels with the outlet hydraulic diameter(Dho) to inlet hydraulic diameter(Dhi) ratio of 1.49 have one-sided ribbed wall or two-sided ribbed walls, at which the ribbed walls with the flow attack angle of 60o are manufactured with a fixed rib height(e)=10 mm and the ratio of rib spacing(P) to rib height(e)=10. The measurements of heat transfer for V-shaped continuous ribs(case A), parallel broken ribs(case B), and V-shaped broken ribs(case C) have been conducted within the range of Re from 22,000 to 72,000.BR The comparison indicates that among the three different rib arrangements of case A, case B, and case C with two ribbed walls, the case A has the greatest Nusselt number, at which case A and case C produce 158% and 122 higher than case B at Re of 54,000.
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