Turbulator Effects on Heat Transfer in Fan-Driven Flows

摘要

This paper presents effects of 45- and 90-deg delta-wing turbula-tors on heat transfer in inherently swirling fan flow and uniform flow for Reynolds numbers of 6900 and 8900. Results show that a delta-wing turbulator in fan flow is effective in heat transfer augmentation, persisting to X/H = 10 and 8 under constant average flow velocity and constant fan power input conditions, respectively. However, the delta-wing turbulator effect on heat transfer augmentation in fan flow is not as effective as that in uniform flow. Also, the 45-deg delta-wing turbulator has better heat transfer performance than the 90-deg delta-wing turbulator in uniform flow, although they generally have the same effect on heat transfer augmentation in fan flow.