THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Xichao Di

,

Ping Tao

,

Meihui Zhou

,

Jianqiu Zhou

NUMERICAL SIMULATION OF HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS IN TWISTED OVAL TUBES

ABSTRACT
The numerical research aims to investigate the heat transfer performance difference between the twisted tube and the smooth tube at the same hydraulic diameter. The effect of the major/minor axis ratios on the fluid-flow inside the twisted oval tube is studied in the Reynolds number range of 3000-11000, and the integral thermal-hydraulic effectiveness of twisted oval tubes is evaluated. The results show that the twisted wall induces secondary flow perpendicular to the mainstream direction. The vortices are rapidly generated in the pipe-line when the fluid enters the twisted tube section from the upstream section. As the fluid develops further, the vortices converge to form a spiral flow. Numerical simulations indicate that the average Nusselt number of twisted oval tube with a major/minor axes ratio of 1.70 increases by 18.7-35.5%, while the pressure drop increases by 59.9-61.3% compared to smooth oval tube. Furthermore, as the major/minor axes ratio increases from 1.18-2.48, the average Nusselt number experiences an increase of 26.7-38.2%. The twisted tubes within the major/minor axes ratio range of 1.40-1.96 demonstrate superior integral thermal-hydraulic performance compared to other pipes.
KEYWORDS
Twisted oval tube, heat transfer, pressure drop, Integral thermal-hydraulic effectiveness
PAPER SUBMITTED: 2023-07-14
PAPER REVISED: 2023-10-31
PAPER ACCEPTED: 2023-11-14
PUBLISHED ONLINE: 2024-01-20
DOI REFERENCE: https://doi.org/10.2298/TSCI230925281D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 4, PAGES [2817 - 2830]
REFERENCES
  1. Liu, Y., et al., Process Modelling, Optimisation and Analysis of Heat Recovery Energy System for Petrochemical Industry, Journal of Cleaner Production, 381 (2022), 135133
  2. Sadeghianjahromi, A., Wang, C.-C., Heat Transfer Enhancement in Fin-and-Tube Heat Exchangers - A Review on Different Mechanisms, Renewable and Sustainable Energy Reviews, 137 (2021), 110470
  3. Hosseini, A. M., Khorasani, A. F., Experimental and Numerical Study of The Rib Effect in a Gas-Gas Heat Exchanger Performance Used in a Sponge Iron Production Plant (MIDREX), Proceedings of the Institution of Mechanical Engineers - Part A: Journal of Power and Energy, 235 (2021), 7, pp. 1747-1758
  4. Walraven, D., et al., Comparison of Shell-and-Tube with Plate Heat Exchangers for the Use in Low-Temperature Organic Rankine Cycles, Energy Conversion and Management, 87 (2014), Nov., pp. 227-237
  5. Manjunath, K., Kaushik, S. C., Second Law Thermodynamic Study of Heat Exchangers: A Review, Renewable and Sustainable Energy Reviews, 40 (2014), Dec., pp. 348-374
  6. Hajmohammadi, M. R., et al., Heat Transfer Improvement Due to The Imposition of Non-Uniform Wall Heating for in-Tube Laminar Forced Convection, Applied Thermal Engineering, 61 (2013), 2, pp. 268-277
  7. Zhang, L., et al., Experimental Study on Condensation Heat Transfer Characteristics of Steam on Horizontal Twisted Elliptical Tubes, Applied Energy, 97 (2012), Sept., pp. 881-887
  8. Li, X., et al., Research Progress and Application of Heat Transfer Enhancement of Twisted Oval Tubes, The Chinese Journal of Process Engineering, 22 (2022), 5, pp. 561-572
  9. Man, C., et al., The Experimental Study on the Heat Transfer and Friction Factor Characteristics in Tube with a New Kind of Twisted Tape Insert, International Communications in Heat and Mass Transfer, 75 (2016), July, pp. 124-129
  10. Yang, S., et al., Experimental Study on Convective Heat Transfer and Flow Resistance Characteristics of Water Flow in Twisted Elliptical Tubes, Applied Thermal Engineering, 31 (2011), 14-15, pp. 2981-2991
  11. Tan, X.-H., et al., Experimental and Numerical Study of Convective Heat Transfer and Fluid-Flow in Twisted Oval Tubes, International Journal of Heat and Mass Transfer, 55 (2012), 17-18, pp. 4701-4710
  12. Cheng, J., et al., Analysis of Heat Transfer and Flow Resistance of Twisted Oval Tube in Low Reynolds Number Flow, International Journal of Heat and Mass Transfer, 109 (2017), June, pp. 761-777
  13. Guo, A.-N., Wang, L.-B., Parametrization of Secondary Flow Intensity for Laminar Forced Convection in Twisted Elliptical Tube and Derivation of Loss Coefficient and Nusselt Number Correlations by Numerical Analysis, International Journal of Thermal Sciences, 155 (2020), 106425
  14. Guo, A.-N., Wang, L.-B., The Mechanism of Laminar Convective Heat Transfer Enhancement Enforced by Twisting of Elliptical Tube, International Journal of Heat and Mass Transfer, 157 (2020), 119961
  15. Wu, C.-C., et al., Numerical Simulation of Turbulent Flow Forced Convection in a Twisted Elliptical Tube, International Journal of Thermal Sciences, 132 (2018), Oct., pp. 199-208
  16. Gu, H., et al., Performance Investigation on Twisted Elliptical Tube Heat Exchangers with Coupling-Vortex Square Tube Lay-Out, International Journal of Heat and Mass Transfer, 151 (2020), 119473
  17. Gu, H., et al., Influence of Alternating V-Rows Tube Lay-out on Thermal-Hydraulic Characteristics of Twisted Elliptical Tube Heat Exchangers, International Journal of Heat and Mass Transfer, 159 (2020), 120070
  18. Li, X., et al., Study on Shell Side Heat Transport Enhancement of Double Tube Heat Exchangers by Twisted Oval Tubes, International Communications in Heat and Mass Transfer, 124 (2021), 105273
  19. Li, X., et al., Experimental Study on Heat Transfer and Pressure Drop of Twisted Oval Tube Bundle in Cross-Flow, Experimental Thermal and Fluid Science, 99 (2018), Dec., pp. 251-258
  20. Gu, X., et al., Heat Transfer and Flow Resistance Characteristics of Helical Baffle Heat Exchangers with Twisted Oval Tube, Journal of Thermal Science, 31 (2022), 2, pp. 370-378
  21. Luo, C., Song, K., Thermal Performance Enhancement of a Double-Tube Heat Exchanger with Novel Twisted Annulus Formed by Counter-Twisted Oval Tubes, International Journal of Thermal Sciences, 164 (2021), 106892
  22. Jing, D., et al., Size Dependences of Hydraulic Resistance and Heat Transfer of Fluid-Flow in Elliptical Micro-Channel Heat Sinks with Boundary Slip, International Journal of Heat and Mass Transfer, 119 (2018), Apr., pp. 647-653
PDF VERSION [DOWNLOAD]
Numerical simulation of heat transfer and pressure drop characteristics in twisted oval tubes

© 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