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| Under various interface reflecting modes, different transient thermal response will occur in media. Combined radiative-conductive heat transfer is investigated within a participating, anisotropic scattering gray planar slab. The two interfaces of the slab are considered to be diffuse and semitransparent. Using the ray tracing method, an anisotropic scattering radiative transfer model for diffuse reflection at boundaries is set up, and with the help of direct radiative transfer coefficients, corresponding radiative transfer coefficients (RTCs) are deduced. RTCs are used to calculate the radiative source term in energy equation. Transient energy equation is solved by the full implicit control-volume method under the external radiative-convective boundary conditions. The influences of two reflecting modes including both specular reflection and diffuse reflection are examined on transient temperature fields and steady heat flux. According to numerical results obtained in this paper, it is found that there exits great difference in thermal behavior between slabs with diffuse interfaces and that with speccular interfaces for slabs with big refractive index. |
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| Keywords:Combined radiative-conductive heat transfer; ray tracing method; Radiative transfer coefficients; Anisotropic scattering; Diffuse reflection |
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