Results 261 to 270 of about 62,678 (311)

The thermal diffusivity and thermal conductivity coefficient of methanol vapour

Chemical Physics Letters, 1987
Abstract The thermal diffusivity of methanol vapour is measured by the thermal lens technique giving values of 0.76, 1.02, 1.70 and 1.78 N s −1 at 321, 341, 377 and 405 K respectively. These thermal diffusivities are shown to be pressure-independent, the pressure dependence of the thermal conductivity merely reflecting the pressure-dependent heat ...
R.T. Bailey, F.R. Cruickshank, D. Pugh, I.J.M. Weir   +3 more
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Coefficients of Diffusion, Viscosity, and Thermal Conductivity of a Gas

American Journal of Physics, 1962
The coefficients of diffusion, viscosity, and thermal conductivity of a gas are derived in first approximation following the method of Maxwell and Chapman. The derivation differs from previous derivations primarily in the expression and evaluation of the various collision integrals.
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Identification of the thermal conductivity coefficient in two dimension case

Optimization Letters, 2018
In the paper the problem of determining the thermal conductivity coefficient that depends on temperature is studied. The consideration is based on the mixed boundary value problem for the two-dimensional unsteady-state heat equation. The inverse coefficient problem is reduced to a variation problem.
Alla F. Albu, Vladimir I. Zubov
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Peltier coefficient and thermal conductance of a quantum point contact

Physical Review Letters, 1992
We report the observation of quantum size effects in the thermal conductance and Peltier coefficient of a quantum point contact. Our experimental method involves a novel usage of quantum point contacts as local electron gas thermometers.
, Molenkamp, , Gravier, , van Houten H, , Buijk, , Mabesoone, , Foxon   +5 more
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Heat conduction with a temperature-dependent thermal conductivity coefficient

Journal of engineering physics, 1970
A variational method is employed to solve stationary and nonstationary heat conduction problems when the thermal conductivity coefficient is temperature-dependent and the heat generation function of the medium is arbitrary.
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The determination of thermal conductivity coefficients of liquids by a thermal lens technique

Chemical Physics, 1983
Abstract The thermal lens technique, already established for gases, is extended to the measurements of liquid-phase thermal conductivity coefficients, the best values obtained at 300±2 K being 0.59, 0.171, 0.116, 0.149 and 0.110 W m −1 K −1 for water, acetone, chloroform, butan-2-one and chlorobenzene respectively.
R.T. Bailey, F.R. Cruickshank, D. Pugh, S. Guthrie, A. McLeod, W.S. Foulds, W.R. Lee, S. Venkatesh   +7 more
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Analytical Evaluation of the Thermal Conductivity Coefficient of Glass

Glass and Ceramics
A method of analytical calculation of the thermal conductivity coefficient of glass is proposed, which allows, by taking into account the physical essence of the process of radiation-conductive heat transfer in translucent media, to increase the reliability of calculations for different thicknesses of products, taking into account their temperature ...
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Seebeck coefficient and thermal conductivity in doped C60

Journal of Renewable and Sustainable Energy, 2009
Pressed bulk samples of C60 doped with P, Co, Al, and Bi have been investigated for their thermoelectric properties. These samples show extremely low thermal conductivity, typically in the range of 0.1–0.3W∕Km at room temperature. The Seebeck coefficients of Co, Al, and Bi doped C60 solids are in the tens of μV∕K; however, for P doped C60 samples, a ...
Wendong Wang, Zhenjun Wang, Jinke Tang, Shizhong Yang, Hua Jin, Guang-Lin Zhao, Qiang Li   +6 more
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The thermal conductivity coefficient of polyatomic molecules: benzene

Fluid Phase Equilibria, 1992
Abstract The thermal conductivity of a rigid benzene-like model fluid is evaluated using the nonequilibrium molecular dynamics algorithm of Evans, and Evans and Murad. The contribution to the conductivity from rotational degrees of freedom is shown to be significant and density dependent. These contributions are contrasted with those of a homonuclear
P. Ravi, S. Murad, H.J.M. Hanley, D.J. Evans   +3 more
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On the Stability of the Algorithm of Identification of the Thermal Conductivity Coefficient

2019
The paper is devoted to the inverse problem of determining the thermal conductivity coefficient of substance depending on the temperature. The consideration is based on the first boundary value problem for the non-stationary heat equation. The mean-root-square deviation of the temperature distribution field and the heat flux on the boundary of the ...
Alla Albu, Vladimir Zubov
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