Title: Experimental study on condensation heat transfer in vertical helically coiled tubes

Authors: Rashed Ali; Nitin P. Gulhane

Addresses: Department of Mechanical Engineering, Veermata Jijabai Technological Institute, Matunga, Mumbai, India; Pillai College of Engineering, Plot No. 10, Sector 16, New Panvel, Navi Mumbai, Maharashtra 410206, India ' Department of Mechanical Engineering, Veermata Jijabai Technological Institute, Matunga, Mumbai, India

Abstract: In the present experimental study, condensation of steam inside helically coiled tubes was investigated. Three helical coils of coil diameter 110, 135 and 160 mm were tested. The effect of mass flux, coil curvature ratio and temperature difference between steam and tube inner wall on the condensation heat transfer coefficient were analysed. The condensation heat transfer coefficient increases with the increase in the value of mass flux. Temperature difference has substantial effect on the heat transfer coefficient. For the first time, the effect of coil curvature ratio on condensation heat transfer is studied and discussed in the paper. It is found that helical coil having greater coil curvature ratio has high values of condensation heat transfer coefficient in comparison to a low curvature ratio. Experimental results are compared with the work of earlier investigators. A new empirical correlation is developed to predict the condensation heat transfer coefficient.

Keywords: condensation; heat transfer coefficient; helically coiled tube; heat exchanger; experimental; steam.

DOI: 10.1504/IJPSE.2018.093719

International Journal of Process Systems Engineering, 2018 Vol.4 No.4, pp.257 - 274

Available online: 12 Jul 2018 *

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