Natural convection heat transfer in eccentric horizontal annuli between a heated outer tube and a cooled inner tube with different orientation: The case of an elliptical outer tube

2001 ◽  
Vol 30 (8) ◽  
pp. 624-635 ◽  
Author(s):  
Koichi Hirose ◽  
Toshitaka Hachinohe ◽  
Youji Ishii
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Convection Heat Transfer ◽  
Outer Tube ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Horizontal Annuli

scholarly journals Natural Convection Heat Transfer in Concentric Horizontal Annuli Containing a Saturated Porous Medi

1970 ◽  
Vol 6 (1) ◽  
Author(s):  
Ahmed F. Alfahaid, R.Y. Sakr ◽  
M. I. Ahmed
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Porous Media ◽  
Natural Convection ◽  
Convection Heat Transfer ◽  
Natural Convection Heat Transfer ◽  
Saturated Porous Media ◽  
Convection Heat ◽  
Horizontal Annuli

Natural convection in horizontal annular porous media has become a subject receiving increasing attention due to its practical importance in the problem of insulators, such as ducting system in high temperature gas-cooled reactors, heating systems, thermal energy storage systems, under ground cable systems, etc. This paper presents a numerical study for steady state thermal convection in a fully saturated porous media bounded by two horizontal concentric cylinders, the cylinders are impermeable to fluid motion and maintained at different, uniform temperatures.  The solution scheme is based on two-dimensional model, which is governed by Darcy-Oberbeck-Boussinesq equations. The finite element method using Galerkin technique is developed and employed to solve the present problem. A numerical simulation is carried out to examine the parametric effects of Rayleigh number and radius ratio on the role played by natural convection heat transfer in the porous annuli. The numerical results obtained from the present model were compared with the available published results and good agreement is observed. The average Nusselt number at the heating surface of the inner cylinder is correlated to Rayleigh number and radius ratio.Keywords: Natural convection, numerical investigation, saturated porous media, finite element method, concentric horizontal annuli.

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