THERMAL SCIENCE

International Scientific Journal

NUMERICAL STUDY ON THE INFLUENCING MECHANISM OF TWISTED RATIO IN OUTWARD CONVEX CORRUGATED TUBES WITH A TWISTED TAPE INSERT

ABSTRACT
Numerical investigations were conducted on flow and heat transfer in an outward convex corrugated tube with various structural twisted tape inserts. The study investigated the influence of twisted ratio on thermodynamic regulation and mechanism in the corrugated tube. The results indicate that Nusselt number in the corrugated tube (Nuc) exceeds those in the corrugated tube and smooth tube by 120-136% and 171-317%, respectively. Meanwhile, the friction factor increases by 148-153% and 476-514%, respectively. The best overall thermal performance (h = 1.97) is obtained with a high twist ratio (y/w = 5). However, the highest thermal performance (Nuc/Nus = 4.78) is obtained with the lowest twist ratio (y/w = 1.25).
KEYWORDS
PAPER SUBMITTED: 2017-06-14
PAPER REVISED: 2017-10-08
PAPER ACCEPTED: 2017-10-09
PUBLISHED ONLINE: 2018-02-18
DOI REFERENCE: https://doi.org/10.2298/TSCI170614042H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Supplement 2, PAGES [S577 - S584]
REFERENCES
  1. Wen M.Y., Flow structures and heat transfer of swirling jet impinging on a flat surface with micro-vibrations, International Journal of Heat and Mass Transfer, 48 (2005), pp. 545-560.
  2. Das S.S., et al., Mass transfer effects on MHD flow and heat transfer past a vertical porous plate through a porous medium under oscillatory suction and heat source, International Journal of Heat and Mass Transfer, 52 (2009), pp. 5962-5969.
  3. Fujii K., Yamada M., Enhancement of melting heat transfer of ice slurries by an injection flow in a rectangular cross sectional horizontal duct, Applied Thermal Engineering, 60 (2013), pp. 72-78.
  4. Lu J. F., et al., Convective heat transfer of high temperature molten salt in transversely grooved tube, Applied Thermal Engineering, 61 (2013), pp. 157-162.
  5. Zheng N. B., et al., Heat transfer enhancement in a novel internally grooved tube by generating longitudinal swirl flows with multi-vortexes, Applied Thermal Engineering, 95 (2016), pp. 421-432.
  6. Han H. Z., et al., Numerical study of flow and heat transfer characteristics in outward convex corrugated tubes, International Journal of Heat and Mass Transfer, 55 (2012), pp. 7782-7802.
  7. Van Rooyen R. S., Kroeger D. G., Laminar flow heat transfer in internally finned tubes with twisted-tape inserts, 6th IHTC, 2(1978), pp. 577-581.
  8. Pramanik D., Saha S.K., Thermohydraulics of laminar flow through rectangular and square ducts with transverse ribs and twisted tapes, ASME Journal of Heat transfer, 128 (2006), pp. 1070-1080.
  9. Bharadwaj P., et al., Heat transfer and pressure drop in a spirally grooved tube with twisted tape insert, International Journal of Heat Mass Transfer, 52 (2009), pp. 1938-1944.
  10. Liao Q., Xin M., Augmentation of convective heat transfer inside tubes with three-dimensional internal extended surfaces and twisted-tape inserts, Chemical Engineering Journal, 78 (2000), pp. 95-105.
  11. Promvonge P., Eiamsa-ard S., Heat transfer behaviors in a tube with combined conical-ring and twisted-tape insert, International Communication in Heat and Mass Transfer, 34 (2007), pp. 849-859.
  12. Hong M.N., et al, Compound heat transfer enhancement of a converging-diverging tube with evenly spaced twisted-tapes, Chinese Journal of Chemical Engineering, 15 (2007), pp. 814-820.
  13. Thianpong C., et al., Compound heat transfer enhancement of a dimpled tube with a twisted tape swirl generator, International Communication in Heat and Mass Transfer, 36 (2009), pp. 698-704

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence