Porosity dependence on thermal diffusivity and thermal conductivity of lithium oxide Li2O from 200 to 900°C
1980; Elsevier BV; Volume: 91; Issue: 1 Linguagem: Inglês
10.1016/0022-3115(80)90036-7
ISSN1873-4820
AutoresTadashi Takahashi, Takeo Kikuchi,
Tópico(s)Thermodynamic and Structural Properties of Metals and Alloys
ResumoThe porosity dependence on thermal diffusivity and thermal conductivity of Li2O was studied in the temperature range of 200 to 900°C. The relationship between thermal diffusivity αM and porosity P was expressed as αM = αT(1−ζP), \̄gz being 0.93, and also as αM = αT(1 + ηP), η being 1.74 (200°C) ~ 1.11 (900°C). The relationship between thermal conductivity kM and porosity obeyed the generalized Loeb equation kM = kT(1−γP), \̄gg being 1.70, and obeyed the modified Maxwell-Eucken equation kM = kT(1−P)(1 + βP), β being 1.81 (200°C) ~ 1.32 (900°C). Alternative empirical equations were also attempted as αM = αT(1−P)m and kM = kT(1−P)n, m̄ being 0.91 and n̄ = 1.06. The temperature dependence on thermal diffusivity and thermal conductivity was found to be expressed as α = (A' + B'T)−1 and k = (A + BT)−1. The pore correction factors are discussed in terms of porosity and temperature compared to published results.
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