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VERIFICATION OF APPLICABILITY OF THE TWO-EQUATION TURBULENCE MODELS FOR TEMPERATURE DISTRIBUTION IN TRANSITIONAL FLOW IN AN ELLIPTICAL TUBE

ABSTRACT
To increase the efficiency, elliptical tubes are often used in cross-flow heat exchangers. For these kinds of heat exchangers the flow field in the tubes exhibits irregularities. Therefore, various flow regimes can be observed: the turbulent, the transitional, and even the laminar one. Therefore, applying typical turbulence models for numerical calculations may cause significant errors, when flow in the heat exchanger tubes is in the transitional or laminar regime. Hence, the average values of flow velocities and temperature in heat exchanger tubes can be calculated incorrectly. The paper presents empirical verification of applying the basic two-equation turbulence models for a transitional flow of water in an elliptical pipe of a heat exchanger.
KEYWORDS
PAPER SUBMITTED: 2018-12-03
PAPER REVISED: 2018-12-28
PAPER ACCEPTED: 2019-01-24
PUBLISHED ONLINE: 2019-09-22
DOI REFERENCE: https://doi.org/10.2298/TSCI19S4113L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 4, PAGES [S1113 - S1121]
REFERENCES
  1. Oclon, P., Lopata, S., Modeling of the Flow Distribution Inside the Collectors of the high Performance Heat Exchanger, Technical Transactions, Mechanics, 4-M/2011/B (2011), 7, pp. 391-400
  2. Lopata, S., Oclon, P., Investigation of the Flow Conditions in a High-Performance Heat Exchanger, Archives of Thermodynamics, 31 (2010), 3, pp. 37-50
  3. Lopata, S., Oclon, P., Modelling and Optimizing Operating Conditions of Heat Exchanger with Finned Elliptical Tubes, in.: Fluid Dynamics, Computational Modeling and Applications (Ed. L. H. Juarez), InTech, Rijeka, Croatia, 2012, pp. 327-356
  4. Lopata, S., Oclon, P., Analysis of Operating Conditions for High Performance Heat Exchanger with the Finned Elliptical Tube, Rynek Energii, 102 (2012), 5, pp. 112-124
  5. Oclon, P., et al., Numerical Study on the Effect of Inner Tube Fouling on the Thermal Performance of High-Temperature Fin-and-Tube Heat Exchanger, Progress in Computational Fluid Dynamics - An International Journal, 15 (2014), 5, pp. 290-306
  6. Lopata, S., Oclon, P., Numerical Study of the Effect of Fouling on Local Heat Transfer Conditions in a High-Temperature Fin-and-Tube Heat Exchanger, Energy, 92 (2015), Part 1, pp. 100-116
  7. Taler, D., Mathematical Modeling and Experimental Study of Heat Transfer in a low-Duty Air-Cooled Heat Exchanger, Energy Conversion and Management, 159 (2018), Mar., pp. 232-243
  8. Zhang, P., et al., Design and Optimization of a Novel High Temperature Heat Exchanger for Waste Heat Cascade Recovery from Exhaust Flue Gases, Energy, 160 (2018), Oct., pp. 3-18
  9. Zhao, L., et al., Parametric Study on Rectangular Finned Elliptical Tube Heat Exchangers with the Increase of Number of Rows, International Journal of Heat and Mass Transfer, 126 (2018), Part A, pp. 871-893
  10. Taler, D., Oclon, P., Determination of Heat Transfer Formulas for Gas Flow in Fin-and-tube Heat Exchanger with Oval Tubes Using CFD Simulations, Chemical Engineering and Processing: Process Intensification, 83 (2014), Sept., pp. 1-11
  11. Taler, D., Oclon, P., Thermal Contact Resistance in Plate Fin-and-Tube Heat Exchangers, Determined by Experimental Data and CFD Simulations, Int. Journal of Thermal Sciences, 84 (2014), Oct., pp. 309-322
  12. Launder, B. E., Spalding, D. B., The Numerical Computation of Turbulent Flows, Computer Methods in Applied Mechanics and Engineering, 3 (1974), 2, pp. 269-289
  13. Wilcox, D. C., Turbulence Modeling for CFD, DCW Industries, La Canada Flintridge, Cal., USA, 2006
  14. Menter, F., et al., The SST Turbulence Model with Improved Wall Treatment for Heat Transfer Predictions in Gas Turbines, Proceedings, International Gas Turbine Congress, Tokio, 2003
  15. Menter, F. R., et al., A Correlation Based Transition Model using Local Variables Part 1 - Model Formulation, Transactions of the ASME, Journal of Turbomachinery, 128 (2006), 3, pp. 413-422
  16. Langtry, R. B., Menter, F. R., Transition Modeling for General CFD Applications in Aeronautics, Proceedings, 43rd AIAA Aerospace Sciences Meeting and Exhibit, Aerospace Sciences Meetings, Reno, Nev., USA, 2005, AIAA pp. 2005-522
  17. ***, GEA Company Website, www.gea-tc.com.pl/High-performance-heat-exchange
  18. White, F., Fluid Mechanics, McGraw-Hill Science, New York, USA, 2011
  19. ***, ANSYS INC, CFX Solver Theory Guide, CFX-International, Canonsburg, Penn., USA, 2011

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, 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