Radiative Transfer in Nontransparent, Dispersed Media

1988 ◽  
Keyword(s):  
Radiative Transfer ◽  
Dispersed Media

Radiative Transfer in Dispersed Media: Comparison Between Homogeneous Phase and Multiphase Approaches

2009 ◽  
Vol 132 (2) ◽  
Author(s):  
Jaona Randrianalisoa ◽  
Dominique Baillis
Keyword(s):  
Radiative Transfer ◽  
Geometric Optic ◽  
Radiative Properties ◽  
Direct Monte Carlo Simulation ◽  
Traditional Treatment ◽  
Effective Absorption Coefficient ◽  
Homogeneous Phase ◽  
Scattering Effects ◽  
Media Comparison ◽  
Dispersed Media

The radiative transfer in dispersed media in the geometric optic regime is investigated through two continuum-based approaches. The first one is the traditional treatment of dispersed media as continuous and homogeneous systems, referred here as the homogeneous phase approach (HPA). The second approach is based on a separate treatment of the radiative transfer in the continuous and dispersed phases, referred here as the multiphase approach (MPA). The effective radiative properties involved in the framework of the HPA are determined using the recent ray-tracing (RT) method, enabled to overcome the modeling difficulties such as the dependent scattering effects and the misunderstanding of the effective absorption coefficient. The two modeling approaches are compared with the direct Monte Carlo simulation. It is shown that (i) the HPA combined with effective radiative properties, such as those from the RT method, is satisfactory in analyzing the radiative transfer in dispersed media constituting of transparent, semitransparent, or opaque particles. Therefore, the use of more complex continuum models such as the dependence included discrete ordinate method (Singh, B. P., and Kaviany, M., 1992, “Modelling Radiative Heat Transfer in Packed Beds,” Int. J. Heat Mass Transfer, 35, pp. 1397–1405) is not imperative anymore. (ii) The MPA, though a possible candidate to handle nonequilibrium problems, is suitable if the particle (geometric) backscattering is weak or absent. It is the case, for example, for dispersed media constituted of opaque particles or air bubbles. However, caution should be taken with the MPA when dealing with the radiative transfer in dispersed media constituted of nonopaque particles having refractive indexes greater than that of the continuous host medium.

scholarly journals Polarized radiative transfer in dense dispersed media containing optically soft sticky particles

2020 ◽  
Vol 28 (19) ◽  
pp. 28252
Author(s):  
Lanxin Ma ◽  
Cunhai Wang ◽  
Linhua Liu
Keyword(s):  
Radiative Transfer ◽  
Dispersed Media ◽  
Sticky Particles

Radiative Transfer in Dispersed Media

1989 ◽  
Vol 42 (9) ◽  
pp. 241-259 ◽  
Author(s):  
R. Viskanta ◽  
M. P. Mengu¨c¸
Keyword(s):  
Radiative Transfer ◽  
Thermal Radiation ◽  
Radiative Properties ◽  
Governing Equations ◽  
Radiative Transfer Models ◽  
Dispersed Media ◽  
The Continuum ◽  
Transfer Models

In this paper the continuum and noncontinuum (discrete) theories for radiative properties and radiative transfer models in dispersed particulate, porous and cellular media capable of absorbing, emitting, and scattering thermal radiation are reviewed. The governing equations for the radiative transfer are presented. Different models for the radiative properties of dispersed media are discussed. The methods for solving the inverse radiation problems to determine the spectral and total properties of homogeneous and nonhomogeneous radiatively participating dispersed media and other relevant parameters are also reviewed.

The Atmospheres of AGB Stars: Opacities, Radiative Transfer and Models

2008 ◽  
Vol 28 ◽  
pp. 67-74 ◽  
Author(s):  
B. Aringer ◽  
W. Nowotny ◽  
S. Höfner
Keyword(s):  
Radiative Transfer ◽  
Agb Stars
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