International Journal of Thermophysics

, Volume 10, Issue 1, pp 259–268 | Cite as

Determination of the thermal diffusivity and specific heat using an exponential heat pulse, including heat-loss effects

  • C. B. Vining
  • A. Zoltan
  • J. W. Vandersande
Article

Abstract

The one-dimensional heat diffusion equation has been solved analytically for the case of a heat pulse of the form F(t) = exp(−t/τ)/τ applied to the front face of a homogeneous body including the effects of heat loss from the front and back faces. Approximate expressions are presented which yield a simple, accurate technique for the determination of the thermal diffusivity and specific heat, suitable to a wide range of heat-pulse time constant and heat-loss parameters, without recourse to graphical techniques or requiring further computer analysis. A procedure is described for the determination of an effective time constant to allow application of the present results to the case of a nonexponential heat pulse. Experimental results supporting the theoretical analysis are presented for five samples of silicon germanium alloys of various thicknesses, determined using a xenon flash tube heat-pulse exhibiting an exponential dependence. Proper consideration of the experimental heat pulse shape is shown to lead to reliable corrections to the apparent thermal diffusivity, even for relatively long heat-pulse times.

Key words

heat capacity heat-loss correction heat-pulse method specific heat thermal diffusivity 

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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • C. B. Vining
    • 1
  • A. Zoltan
    • 1
  • J. W. Vandersande
    • 1
  1. 1.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA

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