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Modeling of time-resolved coupled radiative and conductive heat transfer in multilayer semitransparent materials up to very high temperatures
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10.1063/1.3664408
/content/aip/journal/apl/99/22/10.1063/1.3664408
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/22/10.1063/1.3664408
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) Flash experiment over a dense POCO AXM-5Q1 graphite sample: experimental and numerical thermograms at 2000 °C. Thickness = 2.0 mm, volume specific heat = 4.0 × 106 J m−3 K−1, absorption coefficient ≈3 × 107 m−1, scattering coefficient negligible.

Image of FIG. 2.
FIG. 2.

(Color online) Flash experiments over a silica aerogel sample (95% porosity): experimental and numerical thermograms at 20 °C (a), 145 °C (b), and 306 °C (c). Properties of front and back layers: thickness ≈50 µm (M), thermal diffusivity ≈1 × 10−6 m2 s−1 (M), absorption coefficient ≈5000 m−1 (I), negligible scattering coefficient (I). Studied material properties: thickness = 3.3 mm (M), volume specific heat = 2.2 × 105 (a), 2.7 × 105 (b), 3.1 × 105 (c) J m−3 K−1 (M), absorption coefficient = 155 (a), 225 (b), 260 (c) m−1 (L), scattering coefficient = 210 (a), 540 (b), 460 (c) m−1 (L), heat exchange coefficient = 5 (a), 25 (b) 70 (c) W m−2 K−1 (I). M (Measured), L (Literature), I (Identified).

Image of FIG. 3.
FIG. 3.

(Color online) Flash experiments over a superinsulator sample (90% porosity): experimental and numerical thermograms at 20 °C (a) and 390 °C (b). The sample is made of (i) SiO2 nanoparticles forming a nanoporous matrix (near 100% of volume fraction), (ii) a small volume fraction (∼1%) of SiC microparticles expected to provide infrared opacity, and (iii) a small volume fraction (∼1%) of micrometric cellulose fibers for a mechanical reinforcement of the nanoporous structure. Properties of the front and back layers: thickness ≈ 150 µm (M), thermal diffusivity ≈ 1 × 10−6 m2 s−1 (M), absorption coefficient ≈ 5000 m−1 (I), negligible scattering coefficient (I). Studied material properties: thickness = 2.4 mm (M), volume specific heat = 2.2 × 105 (a), 1.1×105 (b) J m−3 K−1 (M), absorption coefficient = 90 (a), 10 (b) m−1 (L), scattering coefficient = 4.8 × 103 (a), 10.5 × 103 (b) m−1 (L), heat exchange coefficient = 10 (a), 25 (b) W m−2 K−1 (I). M (Measured), L (Literature), I (Identified).

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/content/aip/journal/apl/99/22/10.1063/1.3664408
2011-11-28
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modeling of time-resolved coupled radiative and conductive heat transfer in multilayer semitransparent materials up to very high temperatures
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/22/10.1063/1.3664408
10.1063/1.3664408
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