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This article presents an experimental study of the heat transfer characteristics and the pressure drop of the circular tube fitted with multiple short-length taper twisted tape in convergent and divergent mode with the pitch ratios of 3, 4 and 5 and full-length twisted tape of two different pitch length such as 10 and 14 cm. Tapered twisted tapes have a larger effect on the enhancement of heat transfer with the lower pressure drop compared with the short-length uniform width twisted tape. Based on constant pumping power and constant heat duty, short-length taper twisted tapes are performed better than full-length twisted tape. Based on the experimental data, correlations are developed by using the statistical analysis and the arrived results are within the acceptable limit.

Energy-efficient heat exchanger equipped with multiple short-length taper twisted tapes