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Table 1
Model expressions for Hertz factor h, porosity influence φ(p) on solid phase conductivity KC and exchange factor FE for radiative conductivity KR.
| Model (ref) | h | φ(p) | FE | Remarks | |
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| Contact conductivity KC | |||||
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| JKR (Johnson et al. 1971) |
|
... | ... | Tight contacts, high KC | |
| GB (Gundlach & Blum 2013) |
|
f1exp(f2(1−p))χ | ... | Tight contacts, χ = 0.41 | |
| G (Gusarov et al. 2003) | ... | (1−p)nC(p) /π | ... | nC(p) = 4–12, random porous | |
| W (Watson 1964) |
|
1 | ... | Loose contacts, low KC | |
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| Radiative conductivity KR | |||||
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| BB (Breitbach & Barthels 1980) | ... | ... | Eq. (2) | Packed beds | |
| GB (Gundlach & Blum 2012) | ... | ... | ϵe1p/ (1−p) | Random porous, e1 = 1.34 | |
Notes. See text for details. The expression for h is given here under the approximation of low gravity.
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