scholarly journals Magnetohydrodynamic flow of dissipative casson-carreau nanofluid over a stretching sheet embedded in a porous medium under the influence of thermal radiation and variable internal heat generation

2019 ◽  
Vol 2 (2) ◽  
pp. 18-36
Author(s):  
Gbeminiyi Sobamowo ◽  
◽  
O. A. Adesina ◽  
Lawrence Jayesimi ◽  
◽  
...  
Keyword(s):  
Porous Medium ◽  
Thermal Radiation ◽  
Heat Generation ◽  
Stretching Sheet ◽  
Internal Heat ◽  
Internal Heat Generation ◽  
Magnetohydrodynamic Flow ◽  
Carreau Nanofluid

Thermal Radiation in a Packed Bed With Internal Heat Generation

2008 ◽  
Author(s):  
Jaap E. Hoffmann
Keyword(s):  
Porous Medium ◽  
Thermal Radiation ◽  
Heat Generation ◽  
Effective Conductivity ◽  
Internal Heat ◽  
Packed Bed ◽  
Internal Heat Generation ◽  
Scattering Coefficients ◽  
Fluid Properties ◽  
Forced Cooling

Thermal radiation and conduction are the main modes of heat transfer in a packed bed with internal heat generation during a loss of forced cooling incident. Due to the large number of spheres, the only feasible way of treating the bed in Computational Fluid Dynamics is through a porous medium approach. Traditionally, CFD treats a porous medium as a fluid zone, whilst fluid properties are adjusted to account for the presence of the solids. In this work, the bed is treated as a gray gass, emitting and absorbing thermal radiation at the solid temperature. A unit cell approach is used to determine the absorption and scattering coefficients. This approach prevents direct radiation between surfaces on opposite sides of the bed, but allows the free surface of the bed to exchange radiation with surrounding structures. Results generated with the proposed model were compared to modelling results using an effective conductivity (Zehner-Schlu¨nder model [1]) to combine the contributions of conduction and radiation.

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