Tianhao Fei, Wenjie Zhang, Chong Zheng, Jian Dong, Linhua Liu. Regulation of ratio of absorptivity to emissivity of composite thermal control coating via orientation of aluminum flakes[J]. Infrared and Laser Engineering, 2023, 52(3): 20220532
- Infrared and Laser Engineering
- Vol. 52, Issue 3, 20220532 (2023)
Fig. 1. Diagram of a coating containing randomly distributed and identically oriented aluminum flakes
Fig. 2. Comparison of radiative properties of spherical particles with varied size parameters calculated by Siris code and Mie theory (wavelength: 0.6283 μm, refractive index of particles: 1.33+0.5i, refractive index of medium: 1)
Fig. 3. Sketch of the two-flux theoretical model
Fig. 4. Comparison of the spectral emissivity of the coating calculated by two-flux method and Ref. [14]
Fig. 5. Spectral radiative properties of aluminum flakes at different incident angles θ . (a) Absorption cross-section σ a; (b) Scattering cross-section σ s; (c) Asymmetry factor g
Fig. 6. Spectral absorptivity of the coating under different orientation angles of aluminum flakes (f v = 0.1)
Fig. 7. Dependence of spectral absorptivity of the coating with the particle volume fraction f v and wavelength λ under orientation angles θ of 0, 15°, 30°, 45°, 60°, 70° and 80°
Fig. 8. Dependence of spectral emissivity of the coating with the particle volume fraction f v and wavelength λ under orientation angles θ of 0, 15°, 30°, 45°, 60°, 70° and 80°
Fig. 9. Dependence of (a) average absorptivity α , (b) average emissivityε , and (c) ratio of absorptivity to emissivity of the coating α /ε with the flake orientation angle θ and volume fraction f v (contour lines: α /ε = 0.8, 1.0, 1.3)
Fig. 10. Dependence of (a) average absorptivity α , (b) average emissivity ε and (c) ratio of absorptivity to emissivity of the coating α /ε with the thickness d under different flake orientation angle θ (f v = 0.2)
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