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  • Articles  (24)
  • thermal conductivity  (24)
  • Springer  (24)
  • American Chemical Society
  • American Geophysical Union
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  • 2000-2004  (24)
  • 1970-1974
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  • Physics  (21)
  • Technology  (4)
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  • Articles  (24)
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  • Springer  (24)
  • American Chemical Society
  • American Geophysical Union
  • De Gruyter
  • Emerald
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  • 1
    Electronic Resource
    Electronic Resource
    Thermal Transport in BPSCCO System Between 20 and 170 K (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 617-621 
    Details
    ISSN: 1572-9605
    Keywords: thermal conductivity ; (Bi,Pb) 2223 pellet ; thermal conductivity peak ; phonon + electron approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thermal conductivity of superconducting (Bi,Pb)2223 pellet in the temperature range 20–170 K is reported. Electronic contribution to thermal conductivity in the normal state is estimated to be ∼25%. Considering both phonon and phonon + electron approach, we attempted to examine the observed nature of the temperature dependence of thermal conductivity. Our analysis strongly supports the role of phonons as well as electrons in the origin of the thermal conductivity peak in the superconducting state. Some of the microscopic quantities evaluated from the best-fit parameters obtained from phonon + electron approach give reasonable values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007837220525
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  • 2
    Electronic Resource
    Electronic Resource
    Particularities of Heat Conduction in Nanostructures (2000)
    Springer
    Journal of nanoparticle research 2 (2000), S. 199-204 
    Details
    ISSN: 1572-896X
    Keywords: nanoscale heat transfer ; nanoparticles ; nanowires ; phonons ; superlattices ; thermal conductivity ; thin films ; microscale effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract Heat conduction in nanostructures differs significantly from that in macrostructures because the characteristic length scales associated with heat carriers, i.e., the mean free path and the wavelength, are comparable to the characteristic length of nanostructures. In this communication, particularities associated with phonon heat conduction in nanostructures, the applicability of the Fourier law, and the implications of nanoscale heat transfer effects on nanotechnology are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010003718481
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  • 3
    Electronic Resource
    Electronic Resource
    Transport Coefficients of Hydrogen and Argon–Hydrogen Plasmas (2000)
    Springer
    Plasma chemistry and plasma processing 20 (2000), S. 279-297 
    Details
    ISSN: 1572-8986
    Keywords: Transport coefficients ; transport properties ; viscosity ; thermal conductivity ; electrical conductivity ; diffusion coefficient ; Chapman–Enskog method ; hydrogen ; argon ; plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Calculated values of the viscosity, thermal conductivity, and electrical conductivity of hydrogen and mixtures of argon and hydrogen at high temperatures are presented. Combined ordinary, pressure, temperature, and electric field diffusion coefficients are also given for the mixtures. The calculations, which assume local thermodynamic equilibrium, are performed for atmospheric pressure plasmas in the temperature range from 300 to 30,000 K. The results are compared with those of previously published studies. Generally, the agreement is reasonable; those discrepancies that exist are attributed to the improved values of some of the collision integrals used here in calculating the transport coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007099926249
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of Soils at Very Low Moisture Content and Moderate Temperatures (2000)
    Springer
    Transport in porous media 41 (2000), S. 137-147 
    Details
    ISSN: 1573-1634
    Keywords: predictive models ; soils ; thermal properties ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract An analysis of soil thermal conductivity data shows that, at very low moisture content, this property first varies insignificantly and then begins to increase from a certain critical moisture content, whose value tends to depend on clay mass fraction. Two simple models evaluating the critical moisture content were developed; the first one is a fraction of the permanent wilting point; the second one is a simple linear function dependent on clay mass fraction. An insignificant variation of soil thermal conductivity is observed at 20°C, within a water pressure head ranging from 1 × 103 to 1 × 103 m, while for higher temperatures (45–50°C) from 5000 to 100000 m. Three extensions of the enhanced thermal conductivity model by Sundberg, namely SUN-1, SUN-2 and SUN-3, were proposed and tested. They produce an average root mean square error of 27%, 24% and 30%, respectively, with respect to experimental data. SUN-1and SUN-2 predictions could be further improved if better estimates of thermal conductivity at the dry state and the permanent wilting point were provided. SUN-3 is a simple model which does not require information about the PWP and critical moisture content. All SUN models have a potential for implementing the latent heat transfer component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006738727206
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of 2223 BSCCO Superconductor–Polyethylene Glycol Composites Between 20 and 300 K (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 417-422 
    Details
    ISSN: 1572-9605
    Keywords: (Bi,Pb)2223-PEG composites ; thermal conductivity ; polyethylene glycol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thermal conductivity measurements have been taken between 20 and 300 K on composites prepared from polyethylene glycol (PEG) containing various amounts of superconducting (Bi,Pb)2223 powder. The nature of temperature variation of thermal conductivity (λC) of the composites and its magnitude depend strongly on the volume concentration of the high-temperature superconductor (HTSC) filler present in the material. The results have been discussed in the light of models known for polymer–metal powder composites. It is shown that for composites with 2223 powder content 〈44 vol. %, the measured data can be accounted well with Hamilton–Crosser model, taking the sphericity factor into consideration. Failure of Hamilton–Crosser expression for composites with higher filler concentration is thought to be associated with direct contact between the superconducting grains, which shortcircuits the acoustic mismatch resistance in the composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007755125840
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  • 6
    Electronic Resource
    Electronic Resource
    A Method of Determining the Thermophysical Properties and Calorific Intensity of the Organ or Tissue of a Living Body (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 207-215 
    Details
    ISSN: 1572-9567
    Keywords: calorific intensity ; hot probe ; organ or tissue of a living body ; specific heat ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new method was developed to determine simultaneously the thermal conductivity, thermal diffusivity, specific heat, and calorific intensity of the organ or tissue of a living body either in vivo or in vitro with a thin hot probe. By using the method, the thermophysical properties and calorific intensities of a human palm and in vivo liver and a kidney, heart, brain, and foreleg and hindleg muscles of an anesthetized canine were measured. It is concluded that there are no significant differences in the thermophysical properties of organ or tissue of a living body either in vivo or in vitro. The measured thermophysical properties are in good agreement with those reported in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006669207551
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  • 7
    Electronic Resource
    Electronic Resource
    Liquid Thermal Conductivity of Ternary Mixtures of Difluoromethane (R32), Pentafluoroethane (R125), and 1,1,1,2-Tetrafluoroethane (R134a)1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 319-328 
    Details
    ISSN: 1572-9567
    Keywords: correlation ; R125 ; R134a ; R32 ; refrigerant ; ternary mixture ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivities of ternary refrigerant mixtures of difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) in the liquid phase have been measured by the transient hot-wire method with one bare platinum wire. The experiments were performed in the temperature range of 233 to 323 K and in the pressure range of 2 to 20 MPa at various compositions. The measured data are correlated as a function of temperature, pressure, and composition. From the correlation, we can calculate the thermal conductivity of pure refrigerants and their binary or ternary refrigerant mixtures. The uncertainty of the measurements is estimated to be ±2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006619209872
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  • 8
    Electronic Resource
    Electronic Resource
    Correlation for Viscosity and Thermal Conductivity of Liquid Halogenated Ethane Refrigerants1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 367-375 
    Details
    ISSN: 1572-9567
    Keywords: correlation ; hard spheres ; liquid ; refrigerants ; thermal conductivity ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The viscosity and thermal conductivity of liquid halogenated ethane refrigerants from about 200 K to near the critical temperature, at saturation and also at pressures up to 50 MPa, are shown to be satisfactorily correlated on the basis of a scheme developed by Dymond and Assael from consideration of hard-sphere theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006627411689
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal Conductivity Measurement of Semitransparent Solids by Hot-Wire Technique1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 465-478 
    Details
    ISSN: 1572-9567
    Keywords: heat radiation ; hot wire ; thermal conductivity ; semitransparent material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new simple analytic model applicable to the measurement system of a hot wire and a semitransparent solid material is developed. An experimental study is carried out on a special glass sample, glass K9, in the temperature range of 297 to 1230 K, and the radiation-free thermal conductivity is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006695832162
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  • 10
    Electronic Resource
    Electronic Resource
    Thermophysical Properties of the CsPbCl3 Single Crystal Using Pulse Transient Method1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 571-583 
    Details
    ISSN: 1572-9567
    Keywords: CsPbCl3 single crystal ; heat of transition ; phase transition ; pulse transient method ; specific heat ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The main features of the pulse transient method are presented. The method gives the specific heat c and thermal diffusivity a for a single measurement, while thermal conductivity λ is calculated according to λ=caρ, where ρ is the density. The pulse transient method is a dynamic method based on the measurement of the temperature response to a heat pulse produced within a specimen. An apparatus operating in the temperature range from −40 to 100°C is described. Errors are discussed. The thermophysical properties of a CsPbCl3 single crystal are determined using the pulse transient method for a temperature range between 10 and 65°C in the controlled heating and cooling regimes. The data show anomalies in the thermophysical properties around the phase transition temperature at 47°C. Discrepancies in comparison with previously published data are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006668520775
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