International Scientific Journal


This paper presents a study of a free convection flow around the walls of a ventilation mill of the Thermal Power Plant “Kostolac B”, Kostolac, Serbia. A combined method consists of thermography and software post-processing, PATS. The PATS is specially developed for recognition of turbulence zones by the custom processing of large input data sets from thermal videos. The calculations determine maximum temperature fluctuation i.e. peak-to-peak fluctuation at every spot during the recording time. Three thermal videos of the walls were analyzed. Maximum temperature fluctuation occurred in the zones close to the obstacles, which are thus recognized as one of the main sources of turbulence. Besides, PATS has recognized fine camera oscillations and mechanical movements of a flexible material near the dozer wall. The detected zones of turbulence correspond to the previous studies and to the theory. The method shows good potential in the field of free convective flow research through the improvement of testing efficiency and cost savings. State-of-the-art thermograph cameras and updated software are recommended.
PAPER REVISED: 2020-10-23
PAPER ACCEPTED: 2020-10-26
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 4, PAGES [2447 - 2458]
  1. Lienhard IV, J., Lienhard V, J. A Heat Transfer Textbook, 3rd Ed., Phlogiston Press, Cambridge, Massachusetts, USA, 2008
  2. Cengel, Y.A., Heat Transfer: A Practical Approach, 2nd Ed., McGraw-Hill, New York, 2002.
  3. Jiji, L. M., Heat Convection, 2nd Ed., Springer, New York, 2009
  4. Martynenko, O. G., Pavel P., Khramtsov, P. P., Free-Convective Heat Transfer: With Many Photographs of Flows and Heat Exchange, Springer, New York, 2005
  5. White, F., Viscous Fluid Flow, 3rd Ed., McGraw-Hill, New York, 2006
  6. Zhao, Y., Lei, C., Patterson, J. C., Resonance of the thermal boundary layer adjacent to an isothermally heated vertical surface, J. Fluid Mech, 724 (2013), pp. 305-336
  7. Ristić, S., Linić, S., Samardžić, M., Turbulence Investigation in the VTI's Experimental Aerodynamics Laboratory, Thermal Science, 21 (2017), Suppl. 3, pp. S629-S647
  8. Tsuji, T., Nagano, Y., Velocity and Temperature Measurements in a Natural Convection Boundary Layer Along a Vertical Flat Plate, Experimental Thermal and Fluid Science, 2 (1989), pp. 208-213
  9. De Larochelambert, T., Transition to turbulence in strongly heated vertical natural convection boundary layers, Proceedings (Ed. H. C. de Lange and A. A. van Steenhoven, Heat transfer in unsteady and transitional flows) EUROTHERM Seminar 74 Mar 2003, Eindhoven, Netherlands, 2003, pp.183-188,
  10. Malerba, M., Argento, M., Salviuolo, A., Rossi, G. L., A boundary layer inspection on a wing profile through high resolution thermography and numerical methods, WSEAS Transactions on Fluid Mechanics, 3 (2008), 1, pp.18-28
  11. Montelpare, S., Ricci, R., A thermographic method to evaluate the local boundary layer separation phenomena on aerodynamic bodies operating at low Reynolds number, International Journal of Thermal Sciences, 43 (2004), pp. 315-329
  12. Simon, B., Filius, A., Tropea, C., Grundmann, S., IR-Thermography for Dynamic Detection of Laminar-Turbulent Transition, The Proceedings of 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, Lisbon, Portugal, 2016
  13. Linić, S., Оcokoljić, G., Ristić, S., Lučanin, V., Kozić, M., Rašuo, B., Jegdić, B., Boundary Layer Transition Detection by Thermography and Numerical Method Around Bionic Train Model in Wind Tunnel Test, Thermal Science, 22 (2018), 2, pp. 1137-1148
  14. Kozić, M., Ristić, S., Katavić, B., Linić, S., Prvulović, M., Numerical and Experimental Study of Temperature Distribution on Thermal Plant Coal Mill Walls, Environmental Progress & Sustainable Energy, 36 (2017), 5, pp. 1517-1527
  15. Kozić, M., Ristić, S., Katavić, B., Linić, S., Ristić, M.Determination of the Temperature Distribution on the Walls of Ventilation Mill by Numerical Simulation of Multiphase Flow and Thermography, The Proceedings of 5th International Congress of Serbian Society of Mechanics, The Serbian Society of Mechanics, Arandjelovac, Serbia, 2015, F2c, pp. 1-8
  16. Linić, S., Radojković, B., Ristić, M., Vasović, I., One Method for Determining Turbulence Measuring Places Applied to Free-Convection Flow Around Thermal Plant Coal Mill, The Proceedings of the 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, Serbia, 2019, M3G, pp. 1-10
  17. Linić, S., Radojković, B., Ristić, S., The investigation of the temperature distribution around the ventilation mill with thermography, the study - in Serbian, Project TR34028, Institute Goša d.o.o., Belgrade, pp. 9-34, 2017
  18. Schlichting, H., Boundary-Layer Theory, 7th Ed., McGraw-Hill, New York, 1979
  19. Linić, M., The Software for Analyze of the Thermal Video Records - PATS - in Serbian, Final Work, Electrical Engineering High School "Nikola Tesla", Belgrade, Serbia, 2020
  20. ***, Visual Studio, Microsoft Corp.,
  21. Williams, T., et al., Gnuplot,

© 2022 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