THERMAL SCIENCE

International Scientific Journal

Mohamed Braikia

,

Ali Khelil

,

Hassan Naji

,

Larbi Loukarfi

AN EXPERIMENTAL INVESTIGATION OF INTERACTING SWIRLING MULTIPLE JETS

ABSTRACT
This article deals with the experimental investigation of multiple interacting jets, which may be interested in many engineering applications such as design of a ventilation supply device. The main objective of this study is to achieve the best configuration for use in ventilation applications. To achieve this, several parameters have been considered and discussed such as the imbalance in temperature and diffuser orifices position with relative imbalance in flow rate between central and peripheral jets. Flow rate has been adjusted at Reynolds numbers, ranging from 104 to 3∙104. The present study is carried out under uniform heat flux condition for each diffuser, and air is used as a working fluid. Experiences concerning the fusion of several jets show that the resulting jet is clearly more homogenized under the influence of the central swirling jet. Highlights of such an investigation show that, if the relative position of the central jet is higher, the radial spreading of the resultant jet is more important when all jets are in the same plane. This spreading is also improved compared to the case where the relative position of the peripheral jets is higher, thereby allowing to process a large volume of air. In addition, it becomes attractive to operate, especially when we aim premises homogenization.
KEYWORDS
experimental investigation, swirling jets, flow interaction, ventilation, multiple jets
PAPER SUBMITTED: 2018-06-04
PAPER REVISED: 2018-08-14
PAPER ACCEPTED: 2018-08-16
PUBLISHED ONLINE: 2018-09-30
DOI REFERENCE: https://doi.org/10.2298/TSCI180604247B
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 3, PAGES [1963 - 1975]
REFERENCES
  1. Volchkov E. P., An Experimental Study of the Flow Stabilization in a Channel with a Swirled Periphery Jet, Intentional Journal of Heat and Mass Transfer, 43 (2000), pp. 375-386.
  2. Jebamani, D. R., Kumar, T. M. N., Studies On Variable Swirl Intake System for Diesel Engine using Computational Fluid Dynamics, Thermal Science, 12-1 (2008), pp. 25-32.
  3. Huang, Y., Yang, V., Dynamics and Stability of Lean-Premixed Swirl-Stabilized Combustion, Progress in Energy and Combustion Science, 35 (2009), pp. 293-364.
  4. Braikia, M., Loukarfi, L., Khelil, A., Naji, H., Improvement of Thermal Homogenization Using Multiple Swirling Jets, Thermal Science,16 (2012), pp. 237-248.
  5. Syred, N., Beér, J. M., Combustion in Swirling Flows: A Review, Combustion and flame, 23 (1974), pp.143-201.
  6. Holdeman, D. J., Mixing of Multiple Jets with a Confined Subsonic, Crossflow, Prog. Energy Combust. Sci.19-1 (1993), pp. 31-70.
  7. Vakili, S., Gadala, M. S., Boiling Heat Transfer of Multiple Impinging Jets on a Hot Movin Plate, Heat Transfer Engineering, 34-7 (2013), pp. 580-595.
  8. Nuntadusit, C., Wae-Hayee, M., Bunyajitradulya, A., Eiamsa-ard, S., Heat Transfer Enhancement by Multiple Swirling Impinging Jets with Twisted-Tape Swirl Generators, International Communications in Heat and Mass Transfer, 39 (2012), pp. 102-107.
  9. Oyakawa, K., Hanashiro, K., Matsuda, S., Yaga, M., and Hiwada, M., Study on Flow and Heat Transfer of Multiple Impingement Jets, Heat Transfer-Asian Research, 34-6 (2005), pp. 419-431.
  10. Chaudhari, M., Puranik, B., Agrawal, A., Multiple Orifice Synthetic Jet for Improvement in Impingement Heat Transfer, International Journal of Heat and Mass Transfer, 54 (2011), pp. 2056-2065.
  11. Mostafa, A.A., Khalifa, M.M., Shabana, E.A., Experimental and Numerical Investigation of Multiple Rectangular Jets, Experimental Thermal and Fluid Science, 21 (2000), pp. 171-178.
  12. Braikia, M., Loukarfi, L., Djafer, L., Caractérisation Thermique d'un Système Multi Jets Rotationnel, 17éme CFM, Troyes, 2005.
  13. Moawad, A.K., Rajaratnam, N, Stanley, S. J., Mixing with Multiple Circular Turbulent Jets, Journal of Hydraulic Research, 2 (2001), pp. 163-168.
  14. Yin, Z.Q., Zhang, H.J., Lin, J.Z., Experimental Study on the Flow Field Characteristic in the Mixing Region of Twin Jets, Journal of Hydrodynamics, 19-3 (2007), pp. 309-313.
  15. Ozmen, Y., Confined Impinging Twin Air Jets at High Reynolds Numbers, Experimental Thermal and Fluid Science, 35 (2011), pp. 355-363.
  16. Priotic, Z. D., Nedeljkovic, M. S., Contrak, D. S., Jankovic, N.Z., Novel Methods for Axial Fan Impeller Geometry Analysis and Experimental Investigations of the Generated Swirl Turbulent Flow, Thermal Science, 14-1(2010), pp. 125-139.
  17. Gupta, A. K, Lilley, D.G., Syred, N., Swirl Flows, Abacus Press, London, 1984.
  18. Huang, Y., Yang, V., Dynamics and Stability of Lean-Premixed Swirl Stabilized Combustion, Progress in Energy and Combustion Science, 35-4 (2009), pp. 293-364.
  19. Sislian J.P., Cursworth R.A., Measurements of Mean Velocity and Turbulent Intensities in a Free Isothermal Swirling Jet, AIAA Journal, 24-2 (1986), pp. 303-309.
  20. Volchkov, E.P., Matovich, M., Oka, S., Potar, S.Y., Chokhar, I.A., Use of a Laser Doppler Anemometer to study Turbulent Swirled Jets, Heat Transfer, Soviet Research, 23-4 (1991), pp. 470-502.
  21. Viktor, I.T., Yuriy, M.M., Features of Heat Transfer at Interaction of an Impact Swirl Jet with a Dimple, Thermal Science, 20 (2016), pp. 535-545.
PDF VERSION [DOWNLOAD]
An experimental investigation of interacting swirling multiple jets

© 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