Effect of optical properties on radiative-conductive heat transfer in a system of two semitransparent layers

• Published in: Thermophysics and aeromechanics Vol. 27; no. 1; pp. 131 - 138
• Main Author: Timofeev, A. M.
• Format: Journal Article
• Language: English
• Published: Novosibirsk Kutateladze Institute of Thermophysics SB RAS 2020; Springer Nature B.V
• Subjects: Absorption; Computer simulation; Conductive heat transfer; Incident radiation; Optical properties; Optical thickness; Physics; Physics and Astronomy; Scattering coefficients; Snow cover; Substrates; Thermodynamics; selectivity; ice and snow; scattering; reflectance; radiation-conduction heat transfer; semitransparent medium; numerical simulation
• ISSN: 0869-8643; 1531-8699
• DOI: 10.1134/S0869864320010138

The paper offers a numerical simulation of the heat state for a two-layer semitransparent medium that imitates a hypothetical snow cover upon an opaque semi-infinite substrate; the layers of cover have different absorption and scattering coefficients. Computations were performed for key parameters typical of winter season. It was shown that, depending on the optical thickness of every layer and proportions of absorption to scattering in the incident radiation, we observe more intense heating of near-surface or deeper zones in the snow-ice medium. The radiation part of problem was solved using a modified average-flux method used to take into account the dependency of optical properties on the wavelength of incident radiation, scattering, and reflectance at the layers boundaries.