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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of thermal diffusivity by the flash method for a two-layer composite sample in the case of triangular pulse (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 803-810 
    Details
    ISSN: 1572-9567
    Keywords: composites ; copper ; flash method ; iron ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method for measuring thermal diffusivity in one of the layers of a two-layer composite sample has been described. The heat transfer problem of a two-layer sample associated with pulse thermal diffusivity measurements has been analyzed for two cases: exponential and square-wave pulses. According to our measurements, a triangular heat-pulse function approximates reasonably well the output of the Nd-glass laser. In this paper, an expression is derived for the temperature transient at the rear face of two-layer sample being subjected to a triangular heat-pulse input on the front face. The analytical solution of the problem forms the basis of our method of data reduction. This solution has been programmed for computer processing of the data. The method described here has been successfully tested by limited measurements on copper and iron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503837
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some research activities on thermophysical properties in China (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 731-742 
    Details
    ISSN: 1572-9567
    Keywords: specific heat ; thermal conductivity ; thermal diffusivity ; thermal emissivity ; thermophysical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Various aspects of the importance of thermophysical property (TPP) studies to science and technology in China are discussed. Several stages of the development of experimental principles and equipment are described. Some examples of TPP applications in economic practice are presented. Theoretical and methodological studies in this field are summarized. The presentations are limited mostly to work on solids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503831
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Suggestions regarding thermal diffusivity measurements on pyrolytic graphite and pyrolytic boron nitride by the laser pulse method (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 789-802 
    Details
    ISSN: 1572-9567
    Keywords: anisotropic materials ; pyrolytic graphite ; pyrolytic boron nitride ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The laser pulse method can be successfully applied to the measurement of thermal diffusivity of isotropic materials subject to some assumptions. For anisotropic materials, this method is applicable to the measurement of principal thermal diffusivity only on the condition that there is no difference in direction between the principal axis and that of the temperature gradient. After analyzing the heat conduction process in an anisotropic solid, it has been shown that large errors in the measurement of thermal diffusivity would exist if the direction of the principal axis deviates inconspicuously from that of the temperature gradient. The experimental results of thermal diffusivity of highly oriented pyrolytic graphite (HOPG) samples with various deviation angles have been compared with the analytical results. The laser pulse method is not applicable to measurements on semitransparent pyrolytic boron nitride (PBN). We adopted a two-layer composite sample to measure the thermal diffusivity of PBN in the c direction and a particular graphite-PBN composite sample has been prepared which has a very low thermal resistance at the interface. The thermal diffusivity and thermal conductivity of PG (below 2300°C) and PBN (below 1000°C) are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503836
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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