Abstract
Experimental heat transfer data for single-phase water flow in the annuli with corrugated inner tubes are presented. In the annuli with parallel flow, ten different annular arrangements are considered. For water flow rate in the range of 1,700 < Re< 13,000 , data for Nusselt numbers are presented. The results show significant effects of both the pitch to trough height ratio (P/e) and radius ratio (r*). As P/e becomes closer to 8 in the range below the radius ratio (r*) of 0.5, Nusselt numbers increase. However, Nusselt numbers decrease in the range above the radius ratio (r*) of 0.5 because flow reattachment position becomes farther in the narrower clearance.
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