Thermal conductivity of liquid propionates at high temperature and pressure

Experimental data on thermal conductivity of octyl- and heptylpropionate over a wide range of temperature and pressure are presented.Notation T_b boiling point at atmospheric pressure - n_C number of carbon atoms per molecule Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 39, No. 4, pp. 654–657, October, 1980.     

Thermal conductivity of argon in the temperature range 107 to 423 K

The thermal conductivity of argon between 107 and 425 K has been measured in a transient hot-wire instrument. The results in the limit zero density have been employed to assess the accuracy of the instrument using exact kinetic theory expressions and has been found to be better than ±0.5%. The data at elevated densities are employed to examine the applicability of the modified Enskog theory in the gaseous phase and the hard-sphere theory in the liquid phase.Paper presented at the Ninth Symposium on Thermophysical Properties, June 24–27, 1985, Boulder, Colorado, U.S.A.     

Thermal conductivity of binary gas mixtures at low temperatures

A method is proposed for the calculation of the thermal conductivity of gas mixtures at low temperatures. The theoretical values of the thermal conductivity are compared with experimental data.     

Thermal conductivity of nitrogen at high pressures

The results of the measurements of the thermal conductivity coefficients of nitrogen at 298.15 K from atmospheric pressure up to 1 GPa are reported. The experimental values are used to test the Modified Enskog Theory and the corresponding state principle. The experimental values are also compared with the results of computer simulation of the thermal conductivity of a Lennard Jones fluid.     

Thermal conductivity of multicomponent mixtures

The authors propose a method of calculating the effective thermal conductivity of multicomponent mixtures as a function of their structure, the thermal conductivities of the components, their concentrations, and other parameters.     

Thermal conductivity of polymethylphenylsiloxanes at high pressures

Results are presented of an experimental investigation of the thermal conductivity of polymethylphenylsiloxanes in the 20–200°C temperature range and up to 200-MN/m² pressure range. An equation is proposed to compute the heat conduction in the temperature and pressure ranges investigated.     

Thermal conductivity of liquid mixtures

This paper adopts a phenomenological approach and presents a new model of a mixture of nonreacting liquids as a mixture of two interpenetrating continuous media. An analytical relationship for calculating the effective thermal conductivity of a mixture of liquids is given and the results are compared with experimental data.     

Thermal conductivity of gas mixtures reacting at a finite rate

On the besis of an earlier investigation [2], it is noted that, in the presence in a gas mixture of chemical reactions proceeding at a finite rate, the effective thermal conductivity is not only a function of temperature and pressure (as pointed out in [3]) but also a function of the coordinates. It is concluded that the experimental data obtained for a certain measuring-tube geometry are conditional and may differ substantially from those obtained for another geometry.     

Thermal conductivity of sandstone at high pressures and temperatures

Results are given of experimental investigations of the coefficient of thermal conductivity of samples of sandstone at hydrostatic pressures of up to 400 MPa and temperatures of 275–523 K. It is demonstrated that the pressure increase causes a weaker temperature dependence of thermal conductivity. Processes are discussed which lead to additional scattering of heat waves in disordered media.     

Thermal conductivity of binary gas mixtures

The main methods of analysis of heat transfer in mixtures of nonreacting gases are discussed. A new model and method of calculating the thermal conductivity is proposed.     

Thermal conductivity of epoxy-aluminium powder mixtures

Journal of Materials Science -     

Thermal conductivity of mixtures of polyatomic gases at low and moderate density

The paper discusses the prediction of the thermal conductivity of gas mixtures containing polyatomic components at low and moderate density. The prediction scheme adopted is based upon the rigorous kinetic theory of gases and makes use of other thermophysical properties of the pure gases and binary mixtures in the evaluation of the thermal conductivity. Comparisons with accurate experimental data indicate that only for systems in which the mass ratio of the species is near unity and for which inelastic collisions are rare, is a reliable prediction of the mixture thermal conductivity at low density possible. On the other hand, the density dependence of the thermal conductivity is quite accurately represented for most systems.     

Thermal conductivity of carbon tetrafluoride with argon and helium

The paper presents new measurements of the thermal conductivity of the binary mixtures of carbon tetrafluoride with helium and argon. Measurements were performed in a transient, hot-wire instrument at a nominal temperature of 27.5°C and over a range of densities (pressure up to 12 MPa). The accuracy is estimated to be 0.4%, deteriorating to 0.7% around the critical density. The paper provides polynomial fits which represent the data with a standard deviation of 0.4%. An analysis in terms of the Monchick-Pereira-Mason theory, with the translational contributions computed on the basis of earlier measurements of the viscosity of these mixtures, leads to a reasonable representation of the composition dependence of the zero-density thermal conductivity; the collision numbers _ij are treated here as adjustable parameters to obtain an optimum fit for each mixture.     

Thermal conductivity of caproic acid esters at high pressures as a function of the temperature

We present results of an investigation of the thermal conductivity of octylcaproate and nonylcaproate. We obtained generalized formulas to calculate the thermal conductivity of caproates as a function of temperature and pressure. Deceased. Azerbaidzhan Technical University, Baku. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 72, No. 3, pp. 412–419, May–June, 1999.     

Thermal conductivity of heptyl caproate at high temperatures and pressures

Measurements have been made on the thermal conductivity of heptyl caproate at 305–611 K and 0.098–98 MPa.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 57, No. 2, pp. 299–300, August, 1989.     

Thermal conductivity of ceramic fibrous insulators at high temperatures

The temperature and bulk density dependence of the thermal conductivity of commercial aluminosilicate fibrous insulators were studied by using the transient hot wire method. The thermal conductivity of ceramic fibrous insulators in both air and helium gas atmosphere increased with increasing bulk density. At high temperatures, however, the insulators with lower bulk density showed a higher thermal conductivity because of heat radiation. The following experimental relation between thermal conductivity and temperature was obtained for aluminosilicate fibruous insulators: =a exp(b). Relationships are given between the constants a and b and the bulk density. From the relation, the optimum bulk density of ceramic fibrous insulators can be calculated for each working temperature.Paper presented at the Fourth Japan Symposium on Thermophysical Properties, October 20–22, 1983, Yokohama, Japan.     

低温热导率的热扫描法测量

介绍了一种利用热扫描技术测量低温热导率的新方法.实验利用计算机自动采集数据并实时处理给出测量结果,测量温度范围为10 K-300 K.热扫描方法降低了各种漏热影响,修正了因温差测量的困难而带来的实验误差.通过金属铜、铝的测量值与标准数据的比较,发现10 K-300K范围有较好的吻合,相对误差小于5%,温度越低,误差越小.     

Thermal conductivity of polyethyl siloxane liquids at high pressures

The thermal conductivities of three polyethyl siloxane liquids have been investigated experimentally at pressures up to 200 mN/m² in the temperature interval from 20 to 200°C. Equations are proposed for calculations.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 33, No. 3, pp. 464–466, September, 1977.     

制冷机做冷源的低温热导率测量装置研制

设计研制了1套以4.2 K制冷机为冷源的低温热导率快速测量装置.该装置采用可拆卸的具有独立真空环境的样品测试杆,使得样品测试部件与低温冷源部件分离,从而实现不破坏制冷机冷源真空环境及制冷机不复温的情况下快速更换样品.高真空绝热恒温样品杆通过高导热柔性热桥与制冷机冷头良好热耦合.热导率测试采用稳态绝热纵向热流法.除快速测...