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Journal of Porous Media
Fator do impacto: 1.752 FI de cinco anos: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

Volumes:
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Journal of Porous Media

DOI: 10.1615/JPorMedia.2020033653
pages 1187-1199

NUMERICAL SIMULATION AND ENERGY FLUX VECTOR VISUALIZATION OF RADIATIVE-CONVECTION HEAT TRANSFER IN A POROUS TRIANGULAR ENCLOSURE

K. Venkatadri
Department of Mathematics, Sreenivasa Institute of Technology and Management Studies, Chittoor 517127, India
O. Anwar Bég
Fluid Mechanics, Nanosystems and Propulsion, Aeronautical and Mechanical Engineering, School of Computing, Science and Engineering, Newton Building, University of Salford, Manchester M54WT, United Kingdom
P. Rajarajeswari
Department of Computer Science and Engineering, Kingston Engineering College, Vellore 632059, India
V. Ramachandra Prasad
Department of Mathematics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India
A. Subbarao
Department of Mathematics, Madanapalle Institute of Technology and Science, Madanapalle 517325, India
B. Md. Hidayathulla Khan
Department of Mathematics, Aditya College of Engineering, Madanapalle – 517325, India

RESUMO

The results of a detailed theoretical examination of laminar natural convection heat flow in a triangular porous cavity with significant radiative heat transfer and porosity variations are presented. Two-dimensional laminar incompressible flow was considered, in which the left slant and right walls were at low and high temperature, respectively, and the remaining (top) wall was adiabatic. The Darcy-Brinkman isotropic model was utilized, and the coupled governing equations were solved by a numerical method utilizing finite differences. Visualization of the isotherms and streamlines was achieved using the method of energy flux vectors (EFVs). The impacts of the different model parameters (the Rayleigh number, Darcy number, porosity, and radiation parameter) on the thermo-fluid characteristics were studied in detail. The computations showed that convective heat transfer was enhanced with an increase in the Darcy number (permeability), which also led to intensification in the density of the EFV patterns. The flow accelerated with an increase in the buoyancy effect (Rayleigh number) and the temperatures also increased with greater radiative flux. The average Nusselt number decreased with higher porosity. The simulations are relevant to hybrid porous media solar collectors.

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