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Dissipation instability of Couette-like adiabatic flows in a plane channel

Barletta, A. ; Celli, M. ; Lazzari, S. ; Brandão, P.V.

International journal of thermal sciences, 2023-12, Vol.194, p.108571, Article 108571 [Periódico revisado por pares]

Elsevier Masson SAS

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  • Título:
    Dissipation instability of Couette-like adiabatic flows in a plane channel
  • Autor: Barletta, A. ; Celli, M. ; Lazzari, S. ; Brandão, P.V.
  • Assuntos: Adiabatic walls ; Buoyancy force ; Couette flow ; Dual flows ; Linear stability ; Viscous dissipation
  • É parte de: International journal of thermal sciences, 2023-12, Vol.194, p.108571, Article 108571
  • Descrição: The mixed convection flow in a plane channel with adiabatic boundaries is examined. The boundaries have an externally prescribed relative velocity defining a Couette-like setup for the flow. A stationary flow regime is maintained with a constant velocity difference between the boundaries, considered as thermally insulated. The effect of viscous dissipation induces a heat source in the flow domain and, hence, a temperature gradient. The nonuniform temperature distribution causes, in turn, a buoyancy force and a combined forced and free flow regime. Dual mixed convection flows occur for a given velocity difference. Their structure is analysed where, in general, only one branch of the dual flows is compatible with the Oberbeck–Boussinesq approximation, for realistic values of the Gebhart number. A linear stability analysis of the basic stationary flows with viscous dissipation is carried out. The stability eigenvalue problem is solved numerically, leading to the determination of the neutral stability curves and the critical values of the Péclet number, for different Gebhart numbers. An analytical asymptotic solution in the special case of perturbations with infinite wavelength is also developed.
  • Editor: Elsevier Masson SAS
  • Idioma: Inglês
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