Investigation of heat transfer in square porous-annulus

• Published in: International journal of heat and mass transfer Vol. 55; no. 7-8; pp. 2184 - 2192
• Main Authors: Badruddin, Irfan Anjum, Al-Rashed, Abdullah A.A.A., Salman Ahmed, N.J., Kamangar, Sarfaraz
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2012; Elsevier
• Subjects: Analytical and numerical techniques; Computational fluid dynamics; Ducts; Exact sciences and technology; FEM; Finite element method; Flows through porous media; Fluid dynamics; Fluid flow; Fundamental areas of phenomenology (including applications); Heat transfer; Heat transfer in inhomogeneous media, in porous media, and through interfaces; Holes; Laminar flows; Laminar flows in cavities; Mathematical analysis; Nonhomogeneous flows; Physics; Porous medium; Square duct; Walls; Width ratio; Width ratio; Square duct; Heat transfer; Porous medium; FEM; Finite element method; Streamlines; Porous medium flow; Nusselt number; Annular space; Digital simulation; Modelling; Cavity flow; Square section; Mesh generation
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2011.12.023

The current study is focused to analyze the heat transfer characteristics in a porous duct. The mathematical model of heat transfer in a porous duct was solved by converting the governing partial differential equations into a set of algebraic equations with the help of finite element method. A simple three noded triangular element is used to mesh the duct domain. The current problem consists of a square duct with outer walls being exposed to hot temperature Th, and inner walls subjected to cool temperature Tc. Emphasis is given to investigate the effect of width ratio of cavity on heat and fluid flow characteristics inside the porous medium. The results are reported for various duct width ratios, Rayleigh number etc. It is found that the Nusselt number increases with increase in height of cavity along the vertical walls of duct; however the Nusselt number for certain values of duct ratio oscillates along the width of the porous medium at bottom wall of the cavity.