A horizontal porous layer saturated by a non-Newtonian fluid is taken into account. The fluid is a Ostwald-De Waele type of fluid. The layer is heated from below while the upper boundary is isothermal. The lower boundary is impermeable and the upper one is free. A fully developed basic throughflow is considered. The basic state is perturbed by employing small amplitude perturbations such that a linear stability analysis is performed. The disturbances are assumed to be normal modes and a system of ordinary differential equations governing the perturbation dynamics is obtained. These ODEs form an eigenvalue problem that is solved numerically: both the neutral stability curves and the threshold values for the onset of convection are presented.
Onset of thermal convection in a horizontal porous layer saturated by a power-law fluid / Celli M.; Natale Impiombato A.; Barletta A.. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - ELETTRONICO. - 1599:1(2020), pp. 012015.1-012015.6. [10.1088/1742-6596/1599/1/012015]
Onset of thermal convection in a horizontal porous layer saturated by a power-law fluid
Celli M.
;Barletta A.
2020
Abstract
A horizontal porous layer saturated by a non-Newtonian fluid is taken into account. The fluid is a Ostwald-De Waele type of fluid. The layer is heated from below while the upper boundary is isothermal. The lower boundary is impermeable and the upper one is free. A fully developed basic throughflow is considered. The basic state is perturbed by employing small amplitude perturbations such that a linear stability analysis is performed. The disturbances are assumed to be normal modes and a system of ordinary differential equations governing the perturbation dynamics is obtained. These ODEs form an eigenvalue problem that is solved numerically: both the neutral stability curves and the threshold values for the onset of convection are presented.File | Dimensione | Formato | |
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