This study concerns the linear stability of buoyant convection induced by lateral heating inside a shallow cavity. It highlights the effects caused by submitting the flow to horizontal high-frequency vibrations. The steady-state profiles are first derived using a parallel flow approximation and studied for two types of boundaries, either thermally insulating or thermally conducting. The basic flow is found to be attenuated when subjected to horizontal high-frequency vibrations, with a faster decay in the case of thermally insulating walls than in the case of thermally conducting walls. The effects of vibrations and thermal boundary conditions are then investigated for various types of instability that may arise in such a situation, depending on the Prandtl number, such as shear, oscillatory, and thermal instabilities. It is observed that horizontal high-frequency vibrations have a stabilizing effect on all instabilities developing in such a situation and that this stabilization is generally more efficient in the case of insulating walls, for which the basic flow is attenuated more rapidly. We finally analyze the physical mechanisms that trigger these instabilities through fluctuating energy budgets at the critical thresholds.
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August 2023
Research Article|
August 03 2023
Linear stability of natural convection in a differentially heated shallow cavity submitted to high-frequency horizontal vibrations
Abdessamed Medelfef
;
Abdessamed Medelfef
a)
(Conceptualization, Investigation, Methodology, Resources, Validation, Writing – original draft)
1
Laboratoire de Thermodynamique et Systèmes Energétiques, Faculté de Physique, Université des Sciences et de la Technologie Houari Boumediène
, BP 32, 16111 Bab Ezzouar, Alger, Algeria
a)Author to whom correspondence should be addressed: abs.medelfef@gmail.com
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Daniel Henry
;
Daniel Henry
(Conceptualization, Funding acquisition, Investigation, Writing – original draft)
2
Laboratoire de Mécanique des Fluides et d'Acoustique, CNRS, Université de Lyon, Ecole Centrale de Lyon/Université Lyon 1/INSA Lyon, ECL
, 36 Avenue Guy de Collongue, 69134 Ecully Cedex, France
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Slim Kaddeche
;
Slim Kaddeche
(Conceptualization, Validation, Writing – review & editing)
3
Laboratoire de Recherche Matériaux, Mesures et Applications LR-11-ES-25, Institut National des Sciences Appliquées et de Technologie
, BP 676, 1080 Tunis Cedex, Tunisia
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Faiza Mokhtari;
Faiza Mokhtari
(Conceptualization, Writing – review & editing)
1
Laboratoire de Thermodynamique et Systèmes Energétiques, Faculté de Physique, Université des Sciences et de la Technologie Houari Boumediène
, BP 32, 16111 Bab Ezzouar, Alger, Algeria
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Samia Bouarab
;
Samia Bouarab
(Conceptualization, Writing – review & editing)
4
Université M'hamed Bougara
, Avenue de l'indépendance, 35000 Boumerdès, Algeria
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Valéry Botton
;
Valéry Botton
(Conceptualization, Writing – review & editing)
2
Laboratoire de Mécanique des Fluides et d'Acoustique, CNRS, Université de Lyon, Ecole Centrale de Lyon/Université Lyon 1/INSA Lyon, ECL
, 36 Avenue Guy de Collongue, 69134 Ecully Cedex, France
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Ahcene Bouabdallah
Ahcene Bouabdallah
(Funding acquisition, Resources, Writing – review & editing)
1
Laboratoire de Thermodynamique et Systèmes Energétiques, Faculté de Physique, Université des Sciences et de la Technologie Houari Boumediène
, BP 32, 16111 Bab Ezzouar, Alger, Algeria
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a)Author to whom correspondence should be addressed: abs.medelfef@gmail.com
Physics of Fluids 35, 084107 (2023)
Article history
Received:
May 27 2023
Accepted:
July 16 2023
Citation
Abdessamed Medelfef, Daniel Henry, Slim Kaddeche, Faiza Mokhtari, Samia Bouarab, Valéry Botton, Ahcene Bouabdallah; Linear stability of natural convection in a differentially heated shallow cavity submitted to high-frequency horizontal vibrations. Physics of Fluids 1 August 2023; 35 (8): 084107. https://doi.org/10.1063/5.0159867
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