Thermal Conductivity of Solid Carbon Dioxide

IF 2.5 4区 工程技术 Q3 CHEMISTRY, PHYSICAL
Md Saiduzzaman, Viacheslav A. Konstantinov, Ove Andersson
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引用次数: 0

Abstract

The thermal conductivity κ of solid CO2 was studied in the temperature T range of 100–220 K and at pressures up to 200 MPa using the transient hot-wire method. The results are consistent with those expected for a polycrystal composed of small molecules, with κ increasing significantly as the temperature decreases and as pressure and density increase. The variation in κ with temperature is primarily attributed to changes in phonon–phonon scattering and density. The thermal conductivity behaviour is described using a two-basis model, where heat is transported by both phonons and diffuse modes. The density ρ dependence of the thermal conductivity, represented by the Bridgman parameter g = (d ln κ/d ln ρ)T, was found to be g = 6.7 at 190 K, increasing to 9.4 at 110 K as the temperature decreases. This increase is attributed to an enhanced phonon contribution to the total κ.

固体二氧化碳的导热性
采用瞬态热线法研究了固体CO2在温度T为100 ~ 220 K,压力为200 MPa时的导热系数κ。结果与小分子组成的多晶的结果一致,κ随着温度的降低和压力和密度的增加而显著增加。κ随温度的变化主要归因于声子-声子散射和密度的变化。热导行为是用一个双基模型来描述的,其中热是通过声子和扩散模式来传输的。用Bridgman参数g = (d ln κ/d ln ρ)T表示的导热系数的密度ρ依赖关系在190 K时为g = 6.7,在110 K时随着温度的降低而增加到9.4。这种增加归因于声子对总κ的贡献增强。
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来源期刊
CiteScore
4.10
自引率
9.10%
发文量
179
审稿时长
5 months
期刊介绍: International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.
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