Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Numerical Simulation of Convection in a Lid-Driven Cavity Filled with Heterogeneous Porous Medium
Submission Author:
Allan Camargo , PR
Co-Authors:
Felipe da Silva Santos, Vinicius Gustavo Poletto , Fernando Cesar De Lai, Silvio L. M. Junqueira, Allan Camargo
Presenter: Allan Camargo
doi://10.26678/ABCM.COBEM2017.COB17-1245
Abstract
The convection within a lid-driven square porous cavity subjected to a gravitational stable condition is numerically simulated. The porous media is modeled in the pore-scale with the solid constituent as square, solid, identical and equally spaced heat conductive blocks. To evaluate the influence of the number of blocks over the heat transfer, the balance equations are considered separately for the fluid and the solid domains with coupling boundary conditions applied at the block surfaces. The modeling equations are solved numerically via the Finite Volume method using the QUICK and SIMPLE schemes. The fluid volume fraction and the Prandtl number are kept constant as φ=0.36 and Pr=1. The effect of the variation of the Reynolds number for Re=(1000, 2500), the Grashof number Gr=(10e5, 10e6, 10e7) and the number of blocks N=(1, 4, 9, 16, 25, 36, 49, 64) is investigated. Results demonstrate that buoyancy restrains the flow and eventually stagnate the fluid near the cavity base establishing a conduction-dominant heat transfer regime. In general, the introduction of blocks imposes more resistance to the flow reducing the fluid circulation and, consequently, the surface-averaged Nusselt number. Nevertheless, the blockage effect leads to the heat transfer augmentation for a number of cavity configurations.
Keywords
Heterogeneous porous media, Lid-driven cavity, pore-scale, gravitational stable condition
