Numerical investigation of heat transfer and fluid flow of water through a circular tube induced with divers' tape inserts

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Oni, Taiwo O. ; Paul, Manosh C. (2016)

An investigation was carried out to analyse numerically heat transfer and flow characteristics of water through a circular tube induced with different twisted tapes. The aim is to know which of the tube designs gives the best performance when compared with a plain tube. Turbulent flow was considered, the walls of the tubes were under uniform wall heat flux, Reynolds number was between 5000 and 20,000, and RNG κ-ε model was selected for the simulations. The shape of cuts on the tapes has effects on the performance of the induced tubes. The tube fitted with alternate-axis triangular cut twisted tape has the best performance as its Nusselt number and friction factor are 1.63–2.18 and 2.60–3.15 times, respectively, that of the tube fitted with plain twisted tape while its thermal performance factor is 1.35–1.43 times that of the tube with plain twisted tape. New correlations were developed for the Nusselt number and friction factors, and reveal that the Nusselt number obtained from the new correlation agrees well with the correlation proposed by Thianpong et al. with a discrepancy of 2.21%. For the friction factor, the discrepancy is 3.01%.
  • References (9)

    [1] A. G. Patil, Laminar flow heat transfer and pressure drop characteristics of power-law fluids inside tubes with varying width twisted tape inserts, ASME Trans. J. Heat Transf. 122 (2000) 143-149.

    [2] S. K. Saha, A. Dutta, S. K. Dhal, Friction and heat transfer characteristics of laminar swirl flow through a circular tube fitted with regularly spaced twisted-tape elements, Int. J. Heat and Mass Transf. 44 (2001) 4211-4223.

    [3] H. J. Lane, P. J. Heggs, Extended surface heat transfer - the dovetail fin, Appl. Therm. Eng. 25 (2005) 2555- 2565, http://dx.doi.org/10.1016/j.applthermaleng.2004.11.031.

    [4] K. M. Lunsford, Increasing heat exchanger performance, Bryan Research & Engineering Inc., Texas, 1998.

    [5] A. E. Bergles, The imperative to enhance heat transfer, in: S. Kakac, A.E. Bergles, F. Mayinger and H. Yuncii, (Eds.), Heat transfer enhancement of heat exchangers, Kluwer, Dordrecht, 1999, pp. 13-29.

    [6] D. G. Kumbhar, N. K. Sane, Heat transfer enhancement in a circular tube twisted with swirl flow generator: A review. in: Proc. of the Third Int. Conference on Adv. in Mech. Eng.,Gujarat, India, 2010, pp. 188-192.

    [7] L. Wang, B. Sunden, Performance comparison of some tube inserts, Int. Commun. Heat and Mass Transf. 29 (1) (2002) 45-56.

    [8] A. Dewan, P. Mahanta, K. S. Raju, P. S. Kumar, Review of passive heat transfer augmentation techniques, Proc. Inst. Mech. Eng. Part A: J. Power and Energy 218 (2004) 509-527, http://dx.doi.org/10.1243/0957650042456953.

    [9] Q. Liao, M. D. Xin, Augmentation of convective heat transfer inside tubes with three-dimensional internal extended surfaces and twisted-tape inserts, Chem. Eng. J. 78 (2000) 95-105. 19

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