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Home Archives Officers Future meetings Indian Society for Heat and Mass Transfer

ISBN : 978-1-56700-478-6

Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)
2017, December 27-30 , BITS Pilani, Hyderabad, India


DOI: 10.1615/IHMTC-2017.2370
pages 1705-1712


Heat transfer in helical coils under laminar regime is investigated in depth using CFD simulation with relevance to condenser applications. The study includes elaborate analysis of flow and temperature fields in helical tube vis-à-vis a straight tube of the same length. Results reveal the presence of secondary flow that drives the flow from inner to the outer wall of the tube. The temperature profiles are flatter in case of a helical tube compared to a straight tube, which indicates faster penetration of wall effects into the domain. The heat extracted along the length of tube is estimated from enthalpy balance. A significantly high heat duty cycle is observed, establishing a superior cooling potential of helical tube. Furthermore, a parametric study, to check the effects of radius of curvature (centrifugal force) and pitch (torsion) on heat transfer, is conducted. Finally, correlations, for the prediction of Nusselt number, are developed exclusively for the laminar flow regime. The analysis provides comprehensive theoretical insights of flow inside helical tube in laminar region along with design optimization methods.