Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Numerical simulation of mixed convection in cavity filled with heterogeneous and homogeneous porous medium
Submission Author:
Renato Normandia Tavares , PR
Co-Authors:
Fernando Cesar De Lai, Silvio L. M. Junqueira, Renato Normandia Tavares
Presenter: Renato Normandia Tavares
doi://10.26678/ABCM.COBEM2017.COB17-1970
Abstract
In this work the mixed convection inside a sliding lid enclosure heated from below and filled with fluid-saturated porous medium according to the macroscopic and the microscopic approaches is numerically simulated. In the heterogeneous (microscopic) or continuum approach, the solid domain is represented by a set of heat conductive blocks equally spaced and surrounded by fluid. The porous-continuum (macroscopic) or homogeneous model is defined in a visual resolution that does not allow the identification of the solid-fluid interface, and thus can be considered as a single medium. Generalized mass, momentum and energy balance equations are obtained in dimensionless form to represent both the continuum and the porous-continuum models. The numerical solution is obtained via finite volume method. The QUICK interpolation scheme is set for numerical treatment of the advection terms and the SIMPLE algorithm is applied for pressure-velocity coupling. Results for a constant Prandtl number and a laminar regime the effects of varying the Reynolds and Rayleigh numbers for both approaches are presented. The permeability is obtained using the number of blocks (heterogeneous) and the Darcy number (homogeneous) for a fixed fluid volumetric fraction. The average Nusselt number expressions for both the continuum and the porous-continuum models as a function of RaK for each Re are obtained.
Keywords
Mixed Convection, porous medium, Heterogeneous, Homogeneous, Numerical simulation
