Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Onset of Mixed Convection in an Adsorptive Porous Medium
Submission Author:
Gabriela Ferreira , RJ
Co-Authors:
Leandro Alcoforado Sphaier, Leonardo Santos de Brito Alves, Gabriela Ferreira
Presenter: Leandro Alcoforado Sphaier
doi://10.26678/ABCM.COBEM2017.COB17-2811
Abstract
The onset of thermal convective instability in fluid flow through a parallel-plates horizontal channel in the presence of physical adsorption has been investigated. Linear Stability Analysis (LSA) is used in a mixed-convection problem formulation within a homogeneous saturated hygroscopic porous medium. Darcy's Law is used to model the flow field, and transport equations for a dilute mixture of dry air and water are employed to describe the heat and mass flow through the channel. The bounding walls are impermeable at the top and permeable to water at the bottom; they are also subjected to different temperatures: the lower wall is heated while the upper wall is cooled. The normal modes method is applied to perform the LSA of the problem and the resulting eigenvalue composed of a system of complex-valued equations is carried out numerically by a shooting method. Results are reported for the neutral stability curves and determined the critical values for the onset of instability.
Keywords
nonlinear stability analysis, porous medium, Adsorption, Eigenproblem, Heat and mass transfer
