THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

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Numerical simulation study of enhanced convective heat transfer in the tube based on winglet vortex generator

ABSTRACT
In order to enhance the heat transfer effect and improve the energy utilization efficiency of the circular tube under turbulent flow, rhombic and triangular winglet vortex generators are proposed on the basis of rectangular winglet vortex generator. The effects of three vortex generators on flow and heat transfer in the tube are investigated by numerical simulations. The results indicate that, the rectangular and triangular winglets generate two pairs of longitudinal vortices and the triangular winglets generate four pairs of longitudinal vortices due to additional shrinkage regions. The multiple longitudinal vortices increase the mixing between the fluids, raise the temperature in the central region of the tube, and enhance the heat transfer effect. Furthermore, the triangular winglet enhanced tube has the largest direct flow area and the least effect on resistance. The triangular winglet enhanced tube had the best comprehensive performance, followed by the rhombic winglet enhanced tube, and finally, the rectangular winglet enhanced tube. The performance evaluation criterion (PEC) reached 1.04-1.13, 1.05-1.15, and 1.08-1.21 for the three enhanced tubes in the given flow rate interval. In addition, the effect of inclination angle on the triangular winglet enhanced tube was further investigated, and the results show that the best comprehensive performance of enhanced heat transfer is achieved at an inclination angle of 45°, with a maximum PEC of 1.25.
KEYWORDS
PAPER SUBMITTED: 2023-09-10
PAPER REVISED: 2023-10-18
PAPER ACCEPTED: 2023-10-22
PUBLISHED ONLINE: 2023-12-10
DOI REFERENCE: https://doi.org/10.2298/TSCI230910265Z
REFERENCES
  1. Mousa, M.H., et al., Review of heat transfer enhancement techniques for single phase flows, Renewable & Sustainable Energy Reviews, 137(2021), pp. 110566
  2. Alam, T., Kim, M., A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications, Renewable & Sustainable Energy Reviews, 81(2018), pp. 813-839
  3. Akermann, K., et al., Large-Eddy Simulation of turbulent heat transfer in a multiple-started helically rib-roughened pipe, International Journal of Heat and Mass Transfer, 154(2020), pp. 119667
  4. Hasan, M.J., Bhuiyan,A.A. Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries, South African Journal of Chemical Engineering, 45(2023), pp. 305-314
  5. Hu, Q.X., et al., A numerical study of heat transfer enhancement by helically corrugated tubes in the intermediate heat exchanger of a very-high-temperature gas-cooled reactor, Nuclear Engineering and Design, 380(2021), pp. 111275
  6. Kaood, A., et al., Numerical investigation of the thermal-hydraulic characteristics of turbulent flow in conical tubes with dimples, Case Studies in Thermal Engineering, 36(2022), pp. 102166
  7. Yu, J., et al., A simulation study on the condensation flow and thermal control characteristics of mixed refrigerant in a dimpled tube, Applied Thermal Engineering, 231(2023), pp.120889
  8. Mashayekhi, R., et al., Hydrothermal performance of twisted elliptical tube equipped with twisted tape insert, International Journal of Thermal Sciences, 172(2022), pp. 107233
  9. Liaw, K.L., et al., Enhanced turbulent convective heat transfer in helical twisted Multilobe tubes, International Journal of Heat and Mass Transfer, 202(2023), pp.123687
  10. Kurnia, J.C., et al., Laminar convective heat transfer in helical tube with twisted tape insert, International Journal of Heat and Mass Transfer, 150(2020), pp. 119309
  11. Chuwattanakul, V., et al., Aerothermal performance evaluation of a tube mounted with broken V-ribbed twisted tape: Effect of forward/ backward arrangement, Case Studies in Thermal Engineering, 41(2023), pp. 102642
  12. Hong, Y.X., et al., Heat transfer and fluid flow behaviors in a tube with modified wire coils, International Journal of Heat and Mass Transfer, 124(2018), pp. 1347-1360
  13. Yang, Y., Numerical study on heat transfer characteristics of molten salt in a flat tube with circular helical wire, Applied Thermal Engineering, 227(2023), pp.120373
  14. Wu, X., et al., A comparative study of fluid flow and heat transfer in the tube with multi-V-winglets vortex generators, Applied Thermal Engineering, 236(2024), pp.121448
  15. Xu, Y., et al., Experimental study of thermal performance and flow behaviour with winglet vortex generators in a circular tube, Applied Thermal Engineering, 135(2018), pp. 257-268
  16. Zheng, N.B., et al., Novel self-join winglet vortex generators for enhanced heat transfer of turbulent airflow in round tubes, International Communications in Heat and Mass Transfer, 130(2022), pp. 105806
  17. Sun, Z.Q., et al., Experimental and numerical studies of intensified turbulent heat transfer in round pipes with curved wing vortex generators, International Journal of Heat and Mass Transfer, 180(2021), pp.121823
  18. Sun, Z.Q., et al., Investigations of the turbulent thermal-hydraulic performance in circular heat exchanger tubes with multiple rectangular winglet vortex generators, Applied Thermal Engineering, 168(2020), pp. 114838
  19. Zhang, K., et al., Effects of the configuration of winglet vortex generators on turbulent heat transfer enhancement in circular tubes, International Journal of Heat and Mass Transfer, 157(2020), pp. 119928
  20. Aridi, R., et al., CFD analysis on the spatial effect of vortex generators in concentric tube heat exchangers-A comparative study, International Journal of Thermofluids, 16(2022), pp.100247
  21. Gnielinski, V., On heat transfer in tubes, International Journal of Heat and Mass Transfer, 63(2013), pp. 134-140
  22. Petukhov, B.S., Heat transfer and friction in turbulent pipe flow with variable physical properties, Advances in Heat Transfer, 6(1970), pp. 503-564
  23. Nakhchi, M.E., Esfahani J.A., Numerical investigation of different geometrical parameters of perforated conical rings on flow structure and heat transfer in heat exchangers, Applied Thermal Engineering, 156(2019), pp. 494-505
  24. Eiamsa-ard, S., et al., Parametric study on thermal enhancement and flow characteristics in a heat exchanger tube installed with protruded baffle bundles, International Journal of Thermal Sciences, 145(2019), pp. 106016
  25. Zhai, C., et al., Heat transfer augmentation in a circular tube with delta winglet vortex generator pairs, International Journal of Thermal Sciences, 140(2019), pp. 480-490