Numerical study of turbulent flows around a cubic obstacle blown from a variable geometry jets diffuser

Authors

  • Abdelhak Fellague Chebra Control, Testing, Measurement and Mechanical Simulation Laboratory , University of Chlef, 2000 Chlef, Algeria
  • Mohamed Braikia Laboratory of control, Testing, Measurement and Mechanical Simulation, University of Chlef, B. P. 151, 2000 Chlef, Algeria.
  • Ali Khelil Laboratory of control, Testing, Measurement and Mechanical Simulation, University of Chlef, B. P. 151, 2000 Chlef, Algeria.
  • Mohammed Bedrouni Laboratory of control, Testing, Measurement and Mechanical Simulation, University of Chlef, B. P. 151, 2000 Chlef, Algeria.
  • Zied Driss Electro-Mechanic Systems Laboratory , National School of Engineers of Sfax, 3038 Sfax, Tunisia

DOI:

https://doi.org/10.24132/acm.2024.837

Keywords:

wall-mounted cube, cooling electronic components, impinging jet, circular jet, lobed jet, swirling jet

Abstract

This research focuses on utilizing numerical simulation to analyse how modifications in the air jet diffuser shape impact the cooling efficiency of electronic parts. The main aim of this study is to understand the physical and thermal mechanisms involved in the process. The study consists in numerically predicting the physical and thermal field of a cubic-shaped obstacle placed in the centre of a square subjected to a resulting flow field created by a transverse flow and a perpendicularly oriented impacting jet. The computations were done at a Reynolds number of 3 410, analyzing three perpendicular impinging jets with the ratio of impinging and cross flow Reynolds numbers α = Rej /ReH having the values of 0.5, 1, and 1.5. The k–ω SST turbulence model was used in this investigation. The effectiveness of the methodology that was put into action was evaluated by referring to the findings derived from the experiments conducted by Masip and his team. Once the methodology was validated, we studied the effect of changing the geometric shapes of the impinging jet diffusers on the cooling efficiency. Three geometrical shapes of air diffusers were tested (circular, swirling and lobed). We noted that there is a direct correlation between flow morphology and cooling efficiency. The impact of the ratio α was analysed and found to have a significant effect on the cooling efficiency. As this ratio increases, the quantity of heat transfer increases in all three air jet diffuser cases. In relation to the lobed air jet, it was observed that the Nusselt number exhibits greater values when compared to the other air jet diffuser cases. Moreover, it was noted that the lobed air jet diffuser can enhance the heat transfer efficiency for α = 1.5 by more than 16.3 % compared to the circular air jet diffuser.

Author Biographies

  • Abdelhak Fellague Chebra, Control, Testing, Measurement and Mechanical Simulation Laboratory , University of Chlef, 2000 Chlef, Algeria

    Fellage chebra Abdelhak is a doctorate at Chlef University. He received his diploma in mechanical engineering from Chlef University (Algeria). He obtained a Master in mechanical engineering from Oran University (Algeria) since 2021. His research activities are on combustion (numerically and empirically), computational fluid dynamics and heat transfer.

  • Mohamed Braikia, Laboratory of control, Testing, Measurement and Mechanical Simulation, University of Chlef, B. P. 151, 2000 Chlef, Algeria.
    Mohamed Braikia obtained a magister in mechanical engineering from Oran University (Algeria). Currently, he is an associate professor at the University of Chlef, Algeria, since 2002, and he is involved in several projects regarding turbulence and heat transfer. His research works and teaching concern experimental techniques, numerical and experimental thermos-flow, computational fluid dynamics, and thermal fluid sciences. Since 2001, he has participated in several national and international meetings and scientific conferences.
  • Ali Khelil, Laboratory of control, Testing, Measurement and Mechanical Simulation, University of Chlef, B. P. 151, 2000 Chlef, Algeria.

    Ali Khelil is a full professor of mechanical engineering since 2018 at Chlef University. He received his diploma in mechanical engineering from Chlef University (Algeria). In 2001, he obtained a magister in mechanical engineering. In 2006, he joined Lille 1’s University of Sciences and Technologies, Polytech’Lille, to pursue the degree of doctor in mechanical engineering. He obtained his degree of doctor in 2008. Since 2008, he has been an associate professor at University of Chlef, Algeria. His research activities are on combustion (numerically and empirically), computational fluid dynamics. and heat transfer. Since 2001, he has participated in several national and international meetings and scientific conferences. He is author and co-author of over 40 referred journal papers

  • Mohammed Bedrouni, Laboratory of control, Testing, Measurement and Mechanical Simulation, University of Chlef, B. P. 151, 2000 Chlef, Algeria.

    Bedrouni Mohamed is a permanent researcher at the LEMSM laboratory of the University of Chlef. He obtained his doctorate in mechanics from the University of Chlef (Algeria) in 2020. His research activities focus on computational fluid dynamics and heat transfer.

  • Zied Driss, Electro-Mechanic Systems Laboratory , National School of Engineers of Sfax, 3038 Sfax, Tunisia

    Prof. Zied Driss is Full Professor in the Department of Mechanical Engineering at National School of Engineers of Sfax (ENIS). He received his Engineering Diploma in 2001, his Master Degree in 2003, his PhD in 2008 and his HDR in 2013 in Mechanical Engineering from ENIS at University of Sfax,. He is interested on the development of numerical and experimental techniques for solving problems in mechanical engineering and energy applications. As a result of his research, he is principal or co-principal investigator on more than 130 papers in peer-reviewed journals, more than 250 communications to international conferences, 15 books and 50 books chapters. Also, he is the main inventors of 3 patents.

Downloads

Published

30-Jun-2024

Issue

Vol. 18 No. 1 (2024)

Section

Articles

License

Copyright (c) 2024 Applied and Computational Mechanics

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

“Numerical study of turbulent flows around a cubic obstacle blown from a variable geometry jets diffuser” (2024) Applied and Computational Mechanics, 18(1). doi:10.24132/acm.2024.837.