THERMAL SCIENCE

International Scientific Journal

Ventsislav D. Zimparov

,

Plamen Bonev

,

Milcho Angelov

,

Jordan Y. Hristov

BENEFITS FROM THE USE OF WIRE-COIL INSERTS IN WATER TRANSITIONAL AND LOW TURBULENT FLOW: THE INFLUENCE OF THE WIRE-COIL PITCH

ABSTRACT
Five wire-coil inserts with fixed wire diameter and different pitches, fitted inside a round tube have been experimentally studied in a transitional and low turbulent flow. Water was used as a working fluid at a wide range of flow conditions: 103 < Re < 104 and 3.9 < Pr < 10.0. The geometrical parameters of the inserts are: e/Di = 0.070, and p/e = 6.7, 9.0, 10.0, 12.5, and 15.0. The variation of the friction factor and heat transfer coefficients have been obtained and compared with those of the smooth pipe. Performance evaluation criteria for the cases FG-1a, FG-2a, and VG-2a have been used to evaluate the maximum and real benefit that can be obtained. The greatest benefit can be achieved with the pitch of the wire-coil insert p/e = 10.0.
KEYWORDS
Heat Transfer Enhancement, transitional and low turbulent flow, pitch of wire-coil insert, benefits
PAPER SUBMITTED: 2021-12-06
PAPER REVISED: 2022-04-02
PAPER ACCEPTED: 2022-04-08
PUBLISHED ONLINE: 2022-05-22
DOI REFERENCE: https://doi.org/10.2298/TSCI211206060Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 4, PAGES [3597 - 3604]
REFERENCES
  1. Webb, R., Kim N., Principles of Enhanced Heat Transfer, 2nd ed., Taylor & Francis Group, New York, USA, 2005.
  2. García, A, et al., Experimental Study of Heat Transfer Enhancement with Wire Coil Inserts in Laminar-Transitional-Turbulent Regimes at Different Prandtl numbers, Int. J. Heat Mass Transfer, 48 (2005), 21-22, pp. 4640-4651.
  3. García, A., et al., Enhancement of laminar and transitional flow heat transfer in tubes by means of wire coil inserts, Int. J. Heat Mass Transfer, 50 (2007), 15-16, pp. 3176-3189.
  4. Martínez, D.S., et al., Heat Transfer Enhancement of Laminar and Transitional Newtonian and non-Newtonian Flows in Tubes with Wire Coil Inserts, Int. J. Heat Mass Transfer, 76 (2014), Sept 2014, pp. 540-548.
  5. Kumar A., Prasad, B.N., Investigation of Twisted Tape Inserted Solar Water Heaters - Heat Transfer, Friction Factor and Thermal Performance Results, Ren. Energy, 19 (2000), 3, pp. 379-398.
  6. Jaisankar, S., et al., Experimental Studies on Heat Transfer and Friction Factor Characteristics of Forced Circulation Solar Water Heater System Fitted with Helical Twisted Tapes, Solar Energy, 83 (2009), 11, pp. 1943-1952.
  7. Jaisankar, S., et al., Studies on Heat Transfer and Friction Factor Characteristics of Thermosiphon Solar Water Heating System with Helical Twisted Tapes, Energy, 34 (2009), 9, pp. 1054-1064.
  8. Jaisankar, S., et al., Experimental Investigation of Heat Transfer and Friction Factor Characteristics of Thermosiphon Solar Water Heater System Fitted with Spacer at the Trailing Edge of Left-Right Twisted Tapes, Energy Conv. Mang., 50 (2009),10, pp. 2638-2649.
  9. Ananth, J., Jaisankar, S., Experimental Studies on Heat Transfer and Friction Factor Characteristics of Thermosiphon Solar Water Heating System Fitted with Regularly Spaced Twisted Tape with Rod and Spacer, Energy Conv. Mang., 73 (2013), Sept 2013, pp. 207-213.
  10. Duffie, J.A., Beckman, W.A., Solar Engineering of Thermal Processes, 3rd ed., John Wiley & Sons, Hoboken, New Jersy, 2006.
  11. García, A., et al., Experimental Study of Heat Ttransfer Enhancement in Flat-Plate Solar Water Collector with Wire-Coil Inserts, App. Therm. Eng., 61 (2013), 2, pp. 461-468.
  12. Zimparov, V.D., et al., Transitional Heat Transfer and Pressure Drop in Plain Horizontal Tubes, Int. Rev. Chem. Eng., 7 (2015), 2, pp. 37-44.
  13. Zimparov, V.D., et al., Transitional Heat Transfer and Pressure Drop in Plain Horizontal Tubes - Revised Study, Int. Rev. Chem. Eng., 9 (2017), 1, pp. 1-7.
  14. Zimparov, V.D., et al., Benefits from the Use of Enhanced Heat Transfer Surfaces in Heat Exchanger Design: A Critical Review of Performance Evaluation, J. Enh. Heat Transfer., 23 (5) (2016), 5, pp. 371-393.
  15. Vicente, P.G., et al., Heat Transfer and Pressure Drop for Low Reynolds Turbulent Flow in Helically Dimpled Tubes, Int. J. Heat Mass Transfer, 45 (2002), 3, pp.543-553.
  16. Olivier, J.A., Single-phase heat transfer and pressure drop of water inside horizontal circular smooth and enhanced tubes with different inlet configurations flow regime, Ph.D. thesis, University of Pretoria, South Africa, 2009.
  17. Yilmaz, M., et al, Performance Evaluation Criteria for Heat Exchangers Based on First Law Analysis, J. Enh. Heat Transfer, 12 (2005), 2, pp. 121-157.
  18. Yilmaz, M., et al, Performance Evaluation Criteria for Heat Exchangers Based on Second Law Analysis, Exergy Int. J., 1 (2001), 4, pp. 278-294.
  19. Webb, R.L., Performance Evaluation Criteria for Use of Enhanced Heat Exchanger Surfaces in Heat Exchanger Design, Int. J. Heat Mass Transfer, 24 (1981), 4, pp. 715-726.
  20. Bejan, A., Entropy Generation through Heat and Fluid Flow, Wiley, New York, USA, 1982.
  21. Zimparov, V., Extended Performance Evaluation Criteria for Enhanced Heat Transfer Surfaces: Heat Transfer Through Ducts with Constant Wall Temperature, Int. J. Heat Mass Transfer, 43 (2000), 1, pp. 3137-3155.
  22. Zimparov, V., Extended Performance Evaluation Criteria for Enhanced Heat Transfer Surfaces: Heat Transfer through Ducts with Constant Heat Flux, Int. J. Heat Mass Transfer, 43 (2001),1, pp. 3137-3155.
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Benefits from the use of wire-coil inserts in water transitional and low turbulent flow: The influence of the wire-coil pitch

© 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