Measurements of thermal diffusivity, specific heat capacity and thermal conductivity with LFA 447 apparatus

Jan Jakub Zajas, Per Heiselberg

Publikation: Bog/antologi/afhandling/rapportRapportForskning

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Resumé

The LFA 447 can be successfully used for measurements of thermal diffusivity, specific heat and thermal conductivity of various samples. It is especially useful when determining the properties of materials on a very small scale. The matrix measurement mode allows for determining the local properties with a fine resolution, down to 1 millimeter.

Special attention needs to be taken when determining the specific heat capacity in the comparative method. First of all, the test and reference sample should be of nearly identical thickness. Secondly, their heat diffusion time should be comparable, so that the heat losses from both samples during the measurement are similar. Finally, the leveling of the samples is very important. Very small discrepancies can cause a massive error in the derivation of specific heat capacity and, as a result, thermal conductivity.
OriginalsprogEngelsk
Udgivelses stedAalborg
ForlagDepartment of Civil Engineering, Aalborg University
Antal sider15
StatusUdgivet - 2013
NavnDCE Technical reports
Nummer144
ISSN1901-726X

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thermal diffusivity
thermal conductivity
specific heat
conductivity
heat
leveling
derivation
causes
matrices

Bibliografisk note

Pdf for print 20 pp.

Emneord

  • Thermal diffusivity
  • LFA 447 apparatus
  • Heat capacity
  • Thermal conductivity

Citer dette

Zajas, J. J., & Heiselberg, P. (2013). Measurements of thermal diffusivity, specific heat capacity and thermal conductivity with LFA 447 apparatus. Aalborg: Department of Civil Engineering, Aalborg University. DCE Technical reports, Nr. 144
Zajas, Jan Jakub ; Heiselberg, Per. / Measurements of thermal diffusivity, specific heat capacity and thermal conductivity with LFA 447 apparatus. Aalborg : Department of Civil Engineering, Aalborg University, 2013. 15 s. (DCE Technical reports; Nr. 144).
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Zajas, JJ & Heiselberg, P 2013, Measurements of thermal diffusivity, specific heat capacity and thermal conductivity with LFA 447 apparatus. DCE Technical reports, nr. 144, Department of Civil Engineering, Aalborg University, Aalborg.

Measurements of thermal diffusivity, specific heat capacity and thermal conductivity with LFA 447 apparatus. / Zajas, Jan Jakub; Heiselberg, Per.

Aalborg : Department of Civil Engineering, Aalborg University, 2013. 15 s. (DCE Technical reports; Nr. 144).

Publikation: Bog/antologi/afhandling/rapportRapportForskning

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N2 - The LFA 447 can be successfully used for measurements of thermal diffusivity, specific heat and thermal conductivity of various samples. It is especially useful when determining the properties of materials on a very small scale. The matrix measurement mode allows for determining the local properties with a fine resolution, down to 1 millimeter.Special attention needs to be taken when determining the specific heat capacity in the comparative method. First of all, the test and reference sample should be of nearly identical thickness. Secondly, their heat diffusion time should be comparable, so that the heat losses from both samples during the measurement are similar. Finally, the leveling of the samples is very important. Very small discrepancies can cause a massive error in the derivation of specific heat capacity and, as a result, thermal conductivity.

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Zajas JJ, Heiselberg P. Measurements of thermal diffusivity, specific heat capacity and thermal conductivity with LFA 447 apparatus. Aalborg: Department of Civil Engineering, Aalborg University, 2013. 15 s. (DCE Technical reports; Nr. 144).