Comparison of different methods for measuring thermal conductivities

Two different methods for the measurement of the thermal conductivity have been applied to a glass (borosilicate) bulk sample. The first method was in the steady-state using an arrangement of gold wires on the sample to create a thermal gradient and to measure the temperatures locally. This allows o...

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Bibliographic Details
Main Authors: Hartung, D., Gather, F., Klar, P. J.
Format: Conference Proceeding
Language:English
Subjects:
BORON SILICATES
BOROSILICATE GLASS
COMPARATIVE EVALUATIONS
FINITE ELEMENT METHOD
FREQUENCY DEPENDENCE
GOLD
HEATING
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MATERIALS SCIENCE
MEASURING METHODS
STEADY-STATE CONDITIONS
TEMPERATURE GRADIENTS
TEMPERATURE MEASUREMENT
THERMAL CONDUCTIVITY
THIN FILMS
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Summary:Two different methods for the measurement of the thermal conductivity have been applied to a glass (borosilicate) bulk sample. The first method was in the steady-state using an arrangement of gold wires on the sample to create a thermal gradient and to measure the temperatures locally. This allows one to calculate the in-plane thermal conductivity of the sample. The same wire arrangement was also used for a 3{omega}-measurement of the direction-independent bulk thermal conductivity. The 3{omega}-approach is based on periodical heating and a frequency dependent analysis of the temperature response. The results of both methods are in good agreement with each other for this isotropic material, if thermal and radiative losses are accounted for. Our results demonstrate that especially in the case of thin-film measurements, finite element analysis has to be applied to correct for heat losses due to geometry and radiation. In this fashion, the wire positions can be optimized in order to minimize measurement errors.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4731576