Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Cooling by Mixed Convection of a Heated Obstacle in a Lid-Driven Cavity of Different Aspect Ratios: A Constructal Design Study
Submission Author:
Rafael da Silveira Borahel , RS
Co-Authors:
Rafael da Silveira Borahel, Flavia Zinani, Luiz Alberto Oliveira Rocha
Presenter: Rafael da Silveira Borahel
doi://10.26678/ABCM.ENCIT2022.CIT22-0490
Abstract
The main purpose of this study is to maximize the dimensionless heat transfer rate (q*) between a heated block (HB) and the surrounding fluid flow in a two-dimensional lid-driven cavity. The constraints of the problem are the cavity area (A) and the HB aspect ratio (AR), while the Degree of Freedom (DOF) is the cavity aspect ratio (AR). The effects of Richardson Number (Ri) and the area fraction between the HB and the cavity areas () are also explored.The air convective flow is laminar, incompressible, and steady-state. The mathematical model is based on the balance equations of mass, momentum and energy. The finite volume method is used to numerically solve the problem. The grid meshes employed in the spatial discretization are subjected to uncertainty analysis using the GCI method, while the mathematical and numerical models are verified against other studies available in the literature. For all Ri and tested, the results indicate that the heat transfer is enhanced by low AR, especially AR = 0.5, which have an elongated horizontal shape. For this AR, the highest q* (19.22) is obtained when the forced convection (Ri = 0.1) prevails and the biggest HB ( = 1/4) is tested.
Keywords
Constructal Design, Heat Transfer in Enclosure, Lid-driven cavity, Mixed Convection
