International Scientific Journal


At present, most numerical methods consider the tube walls as the same constant temperature in the simulations of the heat exchanger, and only the external fluid outside the tubes is considered. To investigate the heat transfer performance of the heat exchanger in the real running state, a conjugate heat transfer simulation is performed for a heat exchanger equipped with cross-combined ellipsoidal dimple tubes in this paper. The k-ε standard turbulence model is selected to simulate the heating process of tube bank. The distributions of the temperature field and flow field are analyzed carefully. The results indicate that the temperature distribution and the heat flux on the tube wall are uneven, which is different from the case regarding the wall boundaries as a constant temperature. The heat transfer performance of the dimpled tube is higher than that of the smooth tube in the heat exchanger, and the heat transfer performance for aligned arrangement is better than that for staggered arrangement. In addition, the influences of geometric and flowing parameters on heat transfer are discussed.
PAPER REVISED: 2023-07-12
PAPER ACCEPTED: 2023-10-05
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 2, PAGES [1849 - 1863]
  1. Kim, J., Choi, H., Aerodynamics of a Golf Ball with Grooves, P I. Mech. Eng. P-J. Spo, 228 (2014), 4, pp. 233-241
  2. Ceren, H, Gulsah, C., Heat Transfer Analysis of Double Tube Heat Exchanger with Wavy Inner Tube, Thermal Science, 26 (2022), 4B, pp. 3455-3462
  3. Mahmood, Gazi, I., et al., Local Heat Transfer and Flow Structure on and Above a Dimpled Surface in a Channel, Trans. ASME, J. Turbomach, 123 (2001), 1, pp. 115-123
  4. Xie, G., et al., Numerical Analysis of Flow Structure and Heat Transfer Characteristics in Square Channels with Different Internal-Protruded Dimple Geometrics, Int. J. Heat Mass Trans, 67 (2013), Dec., pp. 81-97
  5. 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), 102166
  6. Sinaga, N., et al. Second Law Efficiency Analysis of Air Injection Into Inner Tube of Double Tube Heat Exchanger, Alexandria Engineering Journal, 60 (2021), 1, pp. 1465-1476
  7. Wang, Y., et al., Heat Transfer and Hydrodynamics Analysis of a Novel Dimpled Tube, Exp. Therm. Fluid Sci, 34 (2010), 8, pp. 1273-1281
  8. Wang, Y., et al., Heat Transfer and Friction Characteristics for Turbulent Flow of Dimpled Tubes, Chem. Eng. Technol, 32 (2009), 6, pp. 956-963
  9. Park, J., et al., Numerical Predictions of Flow Structure Above a Dimpled Surface in a Channel, Numer. Heat Transfer, Part A, 45 (2004), 1, pp. 1-20
  10. Won, S. Y., et al., Numerical Analysis of Flow Structure Above Dimpled Surfaces with Different Depths in a Channel, Numer. Heat Transfer, Part A, 67 (2015), 8, pp. 827-838
  11. Li, M., et al., Single Phase Heat Transfer and Pressure Drop Analysis of a Dimpled Enhanced Tube, Appl. Therm. Eng, 101 (2016), 1, pp. 38-46
  12. Lee, D., et al., Uneven Longitudinal Pitch Effect on Tube Bank Heat Transfer in Cross-Flow. Appl. Therm. Eng, 51 (2013), 1-2, pp. 937-947
  13. Zhao, L. P., et al., Parametric Study on Rectangular Finned Elliptical Tube Heat Exchangers with the Increase of Number of Rows, Int. J. Heat Mass Trans, 126 (2018), Part A, pp. 871-893
  14. Ibrahim, T. A., Gomaa, A., Thermal Performance Criteria of Elliptic Tube Bundle in Crossflow, Int. J. Heat Mass Transfer, 48 (2009), 11, pp. 2148-2158
  15. Lavasani, A. M., et al., Experimental Study of Convective Heat Transfer from In-Line Cam Shaped Tube Bank in Crossflow, Appl. Therm. Eng, 65 (2014), 1, pp. 85-93
  16. Bayat, H., et al., Experimental Study of Thermal-Hydraulic Performance of Cam-Shaped Tube Bundle with Staggered Arrangement, Energy Convers. Manage, 85 (2014), Sept., pp. 470-476
  17. Alawadhi, E. M., Laminar Forced Convection Flow Past an In-Line Elliptical Cylinder Array with Incli-nation, Int. J. Heat Mass Trans, 132 (2010), 7, 071701
  18. Stanislaw, L., et al., Heat Transfer Coefficient in Elliptical Tube at the Constant Heat Flux, Thermal Sci-ence, 23 (2019), Suppl. 4, pp. S1323-S1332
  19. Li, Z., et al., Numerical Simulation of Flow Field and Heat Transfer of Streamlined Cylinders in Cross-Flow, J. Heat Transfer, 128 (2006), 6, pp. 564-570
  20. Razzaghi, H., et al., Numerical Analysis of the Effects of Changeable Transverse and Longitudinal Pitches and Porous Media Inserts on Heat Transfer from an Elliptic Tube Bundle, J Theor App Mech-Pol, 52 (2014), 3, pp. 767-780
  21. Kong, Y. Q., et al., Air-Side Flow and Heat Transfer Characteristics of Flat and Slotted Finned Tube Bundles with Various Tube Pitches, Int. J. Heat Mass Trans, 99 (2016), Aug., pp. 357-371
  22. Mangrulkar, C. K., et al., Experimental and CFD Prediction of Heat Transfer and Friction Factor Charac-teristics in Cross-Flow Tube Bank with Integral Splitter Plate, Int. J. Heat Mass Trans, 104 (2017), Jan., pp. 964-978
  23. Zhang, L., et al., Numerical Analysis of Heat Transfer Enhancement and Flow Characteristics Inside Cross-Combined Ellipsoidal Dimple Tubes, Case Studies in Thermal Engineering, 25 (2021), 100937
  24. Hassan, M, A., et al., Hydrothermal Characteristics of Turbulent Flow in a Tube with Solid and Perforated Conical Rings, International Communications in Heat and Mass Transfer, 134 (2022), 106000
  25. Kaood, A., Hassan, M, A., Thermo-Hydraulic Performance of Nanofluids Flow in Various Internally Cor-rugated Tubes, Chemical Engineering and Processing - Process Intensification, 154 (2020), 108043
  26. Gnielinski, V., New Equations for Heat and Mass Transfer in Turbulent Pipe and Channel Flow, Int. Chem. Eng, 16 (1976), 2, pp. 359-368.
  27. B. Petukhov, Heat Transfer and Friction in Turbulent Pipe Flow with Variable Physical Properties, Ad-vances in Heat Transfer, 6 (1970), pp. 503-564

© 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