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  • thermal diffusivity  (8)
  • Springer  (8)
  • Blackwell Publishing Ltd
  • Oxford University Press
  • 2000-2004  (6)
  • 1985-1989  (2)
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Keywords
Publisher
  • Springer  (8)
  • Blackwell Publishing Ltd
  • Oxford University Press
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Measurement of Thermal Diffusivity of Thermal Control Coatings by the Flash Method Using Two-Layer Composite Sample1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 535-542 
    Details
    ISSN: 1572-9567
    Keywords: flash method ; thermal contact resistance ; thermal control coatings ; thermal diffusivity ; two-layer composite sample
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal diffusivity of brittle coatings cannot be measured by the flash method directly because of the difficulty of preparing free-standing samples. Adopting the flash method using a two-layer composite sample, it is possible to measure thermal diffusivity if the radiant pulse is well defined and good thermal contact on the interface of the composite sample can be ensured. Using an equilateral trapezoidal pulse of an Nd-glass laser measuring the dimensionless temperature history of the rear face of the sample, we determined the thermal diffusivity of thermal control coatings in the temperature range of 80 to 200°C. The results for different thicknesses of substrate showed that the thermal contact resistance of the interface can be neglected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006660318958
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Diffusivity Measurement of Diamond Films1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 479-485 
    Details
    ISSN: 1572-9567
    Keywords: diamond ; film ; flash method ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper discusses the short-pulse-flash method developed for thermal diffusivity measurements on thin films. Two kinds of CVD diamond film have been prepared, and their thermal diffusivity in the perpendicular direction has been measured with this method. The measurement errors caused by the surface coating are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006648016232
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the thermal diffusivity of molten KCl up to 1000°C by the forced Rayleigh scattering method (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 923-931 
    Details
    ISSN: 1572-9567
    Keywords: high temperature ; KCl ; molten salts ; forced Rayleigh scattering method ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes measurement of the thermal diffusivity of molten KCl in the temperature range from 804 to 1030°C by the forced Rayleigh scattering method. In this contact-free optical measuring technique for the thermal diffusivity of liquids, a sample needs to be colored by the admixture of a dye for suitable absorption of a heating laser beam. The dye substances employed are CoCl2 and NiCl2, which were chosen through the experimental evaluation. The accuracy is estimated to be ±7% for molten KCl colored with NiCl2. The results converted to thermal conductivity show one of the smallest values among other previous data; the difference is a factor of four. The present study demonstrates the promising applicability of the forced Rayleigh scattering method to the measurement of high-temperature molten salts, which has never be attained by other conventional methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133260
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of the Thermal Diffusivity of Metallic Foils and Films by the Photoacoustic Method1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 513-524 
    Details
    ISSN: 1572-9567
    Keywords: metal ; microscopic structure ; phase lag ; photoacoustic effect ; thermal diffusivity ; thin layer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal diffusivities of four kinds of metallic foils from 20 to 200μμm in thickness were measured by a photoacoustic method on the basis of the Rosencwaig and Gersho theory. The measured data for continuous foils of uniform microscopic structure almost agreed with the literature values. Measurements were also carried out on two kinds of metallic thin films with of 10μμm thickness produced by sputtering. The difference in thermal diffusivity between the foils and the sputtered films depended on the uniformity of the microscopic structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006656218049
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of thermophysical properties of molten salts: Mixtures of alkaline carbonate salts (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 1071-1080 
    Details
    ISSN: 1572-9567
    Keywords: alkaline carbonate salts ; density ; high temperatures ; molten salts ; specific heat capacity ; stepwise heating method ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The purpose of this study is to develop measuring methods for the thermal diffusivity, the specific heat capacity, and the density of molten salts, as well as to measure these properties of mixtures of alkaline carbonate salts. The thermal diffusivity is measured by the stepwise heating method. The sample salt is poured into a thin container, and as a result, a three-layered cell is formed. The thermal diffusivity is obtained from the ratio of temperature rises at different times measured at the rear surface of the cell when the front surface is heated by the stepwise energy from an iodine lamp. The specific heat capacity is measured using an adiabatic scanning calorimeter. The density is measured by Archimedes' principle. Thermal conductivity is determined from the above properties. Measured samples are Li2CO3-K2CO3 (42.7–57.3, 50.0-50.0, and 62.0-38.0 mol%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133274
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of Two-Dimensional Effect in the Measurement of Thermal Diffusivity of Thin Films with an AC Calorimetric Method1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 525-534 
    Details
    ISSN: 1572-9567
    Keywords: ac calorimetric method ; thermal diffusivity ; thin film ; two-dimensional effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An ac calorimetric method for measuring the thermal diffusivity of thin-film materials has been widely applied. In the application of this method, the systematic errors caused by the heat loss effect, the edge reflection effect, etc., have been analyzed and corresponding correction methods have been developed. But when measuring films with low thermal diffusivity or with thickness comparable to the thermal diffusion length, a two-dimensional effect which will also result in a systematic error of the measurement is present. In this paper, the mechanism of two-dimensional heat conduction within a thin sample which is supplied a periodic heat flux by a chopped light beam is analyzed. A numerical analysis method is developed to study the effect of the two-dimensional heat conduction on the measured thermal diffusivity values. The relations between the measured thermal diffusivity and independent parameters such as frequency, thickness of sample, width of light spot, etc., are demonstrated to indicate the two-dimensional effect. The experimental precondition for minimizing the systematic error caused by the two-dimensional effect is determined. In addition, the analysis method presented in this paper should be useful for more difficult problems such as error estimation of the thermal diffusivity measurement of coatings or composite films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006608302119
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  • 8
    Electronic Resource
    Electronic Resource
    Correction of Edge Effect in AC Calorimetric Method for Measuring Thermal Diffusivity of CVD Diamond Films1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 487-493 
    Details
    ISSN: 1572-9567
    Keywords: ac calorimetric method ; CVD diamond film ; edge effect ; parameter estimation ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the thermal diffusivity measurement of a CVD diamond film using an ac calorimetric method, the reflection of an ac temperature wave at the edge of the film sample should be considered due to the limited length of the sample and its high thermal diffusivity, i.e., the edge effect. In this case, the measured thermal diffusivity is given as a function of frequency. The relation between the measured thermal diffusivity and the frequency is represented as an analytical expression. The real thermal diffusivity is obtained by correcting the edge effect by two means. One is an iterative method using the directly measured edge length of the sample to fit the analytical expression. The other is a parameter estimation method by which a simplex method is used to estimate the edge length and the real thermal diffusivity. Thermal diffusivities of two diamond films were measured, and data were analyzed using the above methods. The result shows that the parameter estimation method is relatively accurate and convenient in processing test data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006600100302
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