THERMAL SCIENCE

International Scientific Journal

Gaoquan Hu

,

Zhaohui Wang

,

Yiwei Fan

,

Hongmei Yuan

,

Quanjie Gao

STUDY ON THE DISTURBANCE EFFECT OF PULSATING FLOW AND HEAT TRANSFER IN SELF-EXCITED OSCILLATION SHEAR LAYER

ABSTRACT
The fluid movement motion has an important influence on the evolution of the pul¬sating flow in the hot runner. Using the large eddy simulation numerical method, the instantaneous velocity, wall shear stress, boundary-layer thickness, and Nusselt number of hot runner section under different structural parameters at an inlet pressure of 5000 Pa were studied. The research results showed that the backflow vortex can be formed in the hot runner, and the fluid at the axis center of hot runner can form a pulsating flow under the squeezing action of the backflow vortex. The pulsating flow had a strong disturbance effect on the fluid around the axis center and accelerated the heat exchange between the fluid around the axis center and the wall. The disturbance effect of pulsating flow gradually strengthened with the flow of the main flow to the downstream. When d2/d1 was 1-1.8, the wall shear stress first increased and then decreased, and the wall heat transfer efficiency first increased and then decreased. The maximum wall shear stress was 36.4 Pa. When L/D was 0.45-0.65, the boundary-layer thickness first decreased and then increased, and the heat transfer efficiency first increased and then decreased. The minimum boundary-layer thickness was 0.392 mm and the maximum Nusselt number was 138. When d2/d1=1.4 and L/D=0.55, the maximum comprehensive evaluation factor reached 1.241, and the heat transfer efficiency was increased by 24.1%.
KEYWORDS
self-excited oscillation, pulsating flow, enhanced heat transfer, large eddy simulation
PAPER SUBMITTED: 2021-06-11
PAPER REVISED: 2021-09-23
PAPER ACCEPTED: 2021-11-16
PUBLISHED ONLINE: 2022-01-02
DOI REFERENCE: https://doi.org/10.2298/TSCI210611347H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 4, PAGES [3157 - 3170]
REFERENCES
  1. Kline, S. J., et al., The Structure of Turbulent Boundary Layers, Journal of Fluid Mechanics, 30 (2006), 4, pp. 741-773
  2. Rafiee, S. E., Rahimi, M., Three-dimensional Simulation of Fluid Flow and Energy Separation Inside a Vortex Tube, Journal of Thermophysics and Heat Transfer, 28 (2014), 1, pp. 87-99
  3. Colucci, D.W., Viskanta, R., Effect of nozzle geometry on local convective heat transfer to a confined impinging air jet, Experimental Thermal and Fluid Science, 13 (1996), 1, pp. 71-80
  4. Chiriac,V. A., Ortega, A., A Numerical Study of the Unsteady Flow and Heat Transfer in a Transitional Confined Slot Jet Impinging on an Isothermal Surface, International Journal of Heat and Mass Transfer, 45 (2002), 6, pp.1237-1248
  5. Liu, L.K., et al., Transient Convective Heat Transfer of Air Jet Impinging onto a Confined Ceramic-Based MCM, Journal of Electronic Packaging, 126 (2004), 1, pp.159-172
  6. Wang, J. S., et al., Heat Transfer Enhancement Mechanism of Semi Elliptical Vortex Generator, Chinese Journal of Mechanical Engineering, 42 (2006), 5, pp. 160-164 (in Chinese)
  7. Ye, Q. L., et al., Experimental Study on Heat Transfer Enhancement and Pressure Drop Characteristics of Inclined Semi Elliptical Cylindrical Vortex Generator, Chinese Journal of Mechanical Engineering, 46 (2010), 16, pp. 162-169 (in Chinese)
  8. Liu, J. C., et al., Structure Improvement and Fluid Flow Performance Analysis of Plate Fin Heat Exchanger, Chinese Journal of Mechanical Engineering, 50 (2014), 18, pp. 167-176 (in Chinese)
  9. Wang, J. S., et al., Flow and Heat Transfer Characteristics of Bluff Body Turbulence in Turbulent Boundary Layer, Chinese Journal of Mechanical Engineering, 51 (2015), 24, pp. 168-176 (in Chinese)
  10. Fan, A., et al., A Numerical Study on Thermo-hydraulic Characteristics of Turbulent Flow in a Circular Tube Fitted with Conical Strip Inserts, Applied Thermal Engineering, 31 (2011), 15, pp. 2819-2828
  11. Promvonge, P., Eiamsa-Ard, S., Heat Transfer Enhancement in a Tube with Combined Conical-nozzle Inserts and Swirl Generator, Energy Conversion and Management, 47 (2006), 18, pp. 2867-2882
  12. Skullong, S., et al., Thermal Behaviors in a Round Tube Equipped with Quadruple Perforated-delta-winglet Pairs, Applied Thermal Engineering, 115 (2017), pp. 229-243
  13. Hu, G. Q., et al., Study on Heat Transfer in Self-excited Oscillation with Backflow Vortex Disturbance Effect, Journal of Thermophysics and Heat Transfer, 5 (2021), pp. 1-11
  14. Biswas, G., Chattopadhyay, H., Sinha, A., Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators, Heat Transfer Engineering, 33 (2012), 4, pp. 406-424
  15. Deshmukh, P. W., Vedula, R. P., Heat Transfer and Friction Factor Characteristics of Turbulent Flow Through a Circular Tube Fitted with Vortex Generator Inserts, International Journal of Heat and Mass Transfer, 79 (2014), pp. 551-560
  16. Skullong, S., et al., Thermal Performance of Turbulent Flow in a Solar Air Heater Channel with Rib-groove Turbulators, International Communications in Heat and Mass Transfer, 50 (2014), pp. 34-43
  17. Liang, G., et al., Numerical Study of Heat Transfer and Flow Behavior in a Circular Tube Fitted with Varying Arrays of Winglet Vortex Generators, International Journal of Thermal Sciences, 134 (2018), pp. 54-65
  18. Zhang, C. C., et al., Numerical Investigation of Heat Transfer and Pressure Drop in Helically Coiled Tube with Spherical Corrugation, International Journal of Heat and Mass Transfer, 113 (2017), pp. 332-341
  19. Yu, J. C., Li, Z. X., Numerical Analysis of Convective Heat Transfer Enhancement by Laminar Pulse Flow in Circular Tubes with Annular Inner Fins, Journal Tsing University, 45 (2005), 8, pp. 1091-1094 (in Chinese)
  20. Kurtulmus, N., Sahin, B., Experimental Investigation of Pulsating Flow Structures and Heat Transfer Characteristics in Sinusoidal Channels, International Journal of Mechanical Sciences, 167 (2020), 105268
  21. Khosravi-Bizhaem, H., Abbassi, A., Ravan A. Z., Heat Transfer Enhancement and Pressure Drop by Pulsating Flow Through Helically Coiled Tube: An Experimental Study, Applied Thermal Engineering, 160 (2019), 114012
  22. Jin, D. X., Lee, Y. P., Lee, D. Y., Effects of the Pulsating Flow Agitation on the Heat Transfer in a Triangular Grooved Channel, International Journal of Heat and Mass Transfer, 50 (2007), 15, pp. 3062-3071
  23. Yoshikawa, H., et al., Effects of Pulsation on Separated Flow and Heat Transfer in Enlarged Channel, Journal of Thermal Sciences, 20 (2011), 1, pp. 70-75
  24. Lee, J., Lee, S. J., The Efect of Nozzle Configuration on Stagnation Region Heat Transfer Enhancement of Axisymmetric Jet Impingement, International Journal of Heat and Mass Transfer, 43 (2000), 18, pp. 3497-3509
  25. Zheng, D., Wang, X., Yuan, Q., The Effect of Pulsating Parameters on the Spatiotemporal Variation of Flow and Heat Transfer Characteristics in a Ribbed Channel of a Gas Turbine Blade with the Pulsating Inlet Flow, International Journal of Heat and Mass Transfer, 153 (2020), 119609
  26. Yang, B., et al., Numerical Investigation on Flow and Heat Transfer of Pulsating Flow in Various Ribbed Channels, Applied Thermal Engineering, 145 (2018), pp. 576-589
  27. Akdag, U., Akcay, S., Demiral, D., Heat Transfer in a Triangular Wavy Channel with CuO/Water Nanofluids Under Pulsating Flow, Thermal Science, 23 (2017), 1, pp. 191-205
  28. Pan, Z. M., Application and Test of Pipeline Booster in Natural Gas Pipeline, Ph. D. thesis, Chongqin University, Chongqin, China, 2009
  29. Cheng, Z., et al., Multi-objective optimization of self-excited oscillation heat exchange tube based on multiple concepts, Applied Thermal Engineering, 197 (2021), 117414
  30. Wang, J. S., et al., Flow and Heat Transfer Characteristics of Bluff Body Turbulence in Turbulent Boundary Layer, Chinese Journal of Mechanical Engineering, 51 (2015), 24, pp. 168-176 (in Chinese)
  31. Felten, F., et al., Numerical modelling of electromagnetically-driven turbulent flows using LES methods, Applied Mathematical Modelling, 28 (2004), 1, pp. 15-27
  32. Breuer, M., Pourquie, M., First experiences with LES of flows past bluff bodies, in: W. Rodi, G. Bergeles (Ed.), Proc. 3rd Int. Symp. on Engineering Turbulence Modelling and Measurements, Heraklion-Crete, Greece, 27-29 May 1996, Elsevier, Amsterdam, 1996, pp. 177-186
  33. Davletshin, I. A., et al., Convective Heat Transfer in the Channel Entrance with a Square Leading Edge Under Forced Flow Pulsations, International Journal of Heat and Mass Transfer, 129 (2019), pp. 74-85
PDF VERSION [DOWNLOAD]
Study on the disturbance effect of pulsating flow and heat transfer in self-excited oscillation shear layer

© 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