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Augmented heat transfer in rectangular duct with angled Z-shaped ribs
Author(s)
Date Issued
January 1, 2010
Type
Conference Paper
Abstract
An experiment is focused on the design of the suitable ribs used for enhancing heat transfer in a rectangular duct heat exchanger by using wall heat transfer (Nusselt number), friction loss (friction factor) and thermal performance (thermal enhancement factor) data. The Z-shaped ribs were set on the rectangular duct at 30°, 45° and 60° and flat rib was set at 90° relative to the air flow direction. Reynolds numbers studied ranging from 5000 to 25,000 in the test section. The rectangular duct has aspect ratio, AR = 10 and height, H = 30 mm with the Z-rib height (e), e/H = 0.2 and the rib pitch (P), P/H = 3. The ribs were fitted in Z-shape (Z-rib) aligned in series on the whole area of the upper plate. The results of the Z-ribs show the significant increase in heat transfer rate and friction loss over the smooth channel. The 45° Z-rib provides the highest increase in the heat transfer rate and the best thermal performance.
Citation
Proceedings of the International Conference on Energy and Sustainable Development Issues and Strategies Esd 2010, 2010