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A dilatometric method to measure the thermal diffusivity of nonmetallic liquids

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Abstract

A new method to measure the thermal diffusivity of liquids is presented. It requires determination of the time dependence of the thermal expansion of the liquid when it is subjected to a heat source at the top of the cell containing the liquid. The high accuracy of the method (about 3%) is due to an essential reduction of convective currents and also to the absence of temperature detectors, which generally introduce unwanted perturbations on the thermal Field.

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Abbreviations

κ:

Thermal conductivity

c :

Specific heat

π:

Density

μ:

cπ = specific heat x density

h :

Newton coefficient

ξ:

Thermal diffusivity

T, 0:

Temperature

tV :

Electric signal

ε:

Calibration coefficient

ΔΩ Δexp, Δth :

Volume change of the liquid

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Authors and Affiliations

  1. Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 1-10129, Torino, Italy

    M. Omini, A. Sparavigna & A. Strigazzi

Authors
  1. M. Omini
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  2. A. Sparavigna
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  3. A. Strigazzi
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Omini, M., Sparavigna, A. & Strigazzi, A. A dilatometric method to measure the thermal diffusivity of nonmetallic liquids. Int J Thermophys 15, 215–227 (1994). https://doi.org/10.1007/BF01441583

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  • DOI: https://doi.org/10.1007/BF01441583

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