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Effects of a Specularly Reflecting Wall in an Infinite Square Duct on Conductive-Radiative Heat Transfer
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 Title & Authors
Effects of a Specularly Reflecting Wall in an Infinite Square Duct on Conductive-Radiative Heat Transfer
Byeon, Gi-Hong; Han, Dong-Cheon;
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 Abstract
The effects of a specularly reflecting surface on the wall heat flux and medium temperature distribution are studied. The system is an infinite square duct enclosing an absorbing and emitting medium. The walls are opaque, and black or gray. The walls emit diffusely but reflect diffusely or speculary. Heat is transferred by the combined effect of conduction and radiation. The radiative heat transfer is analyzed using direct discrete-ordinates method. The parameters under study are conduction, to radiation parameter, optical depth, wall emissivity, and reflection characteristics. The specular reflection and diffuse reflection show sizeable differences when the conduction to radiation parameter is less than around 0.01. The differences appear only either on the side wall heat flux or on the medium temperature profiles for the range of this study. The differences on the side wall heat flux are observed for optical thickness less than around 0.1 However the differences on the medium temperate profiles are found for optical thickness greater than around 1. The difference increase with increasing reflectance. The specular reflection increases the well heat flux gradient along the side wall.
 Keywords
Specularly Reflecting;Participating;Direct Discrete Ordinates Method;Square;Conductive -Radiative;
 Language
Korean
 Cited by
1.
Radiation-Laminar Free Convection in a Square Duct with Specular Reflection by Absorbing-Emitting Medium,;;

Journal of Mechanical Science and Technology, 2002. vol.16. 10, pp.1346-1354
2.
부도체 방향복사면이 있는 무한 정사각관의 전도-복사열전달,변기홍;임문혁;

대한기계학회논문집B, 2003. vol.27. 5, pp.543-552 crossref(new window)
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