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International Journal of Thermophysics

, Volume 31, Issue 10, pp 1904–1918 | Cite as

Hot-Ball Method for Measuring Thermal Conductivity

  • L’udovít Kubičár
  • Viliam Vretenár
  • Vladimír Štofanik
  • Vlastimil Boháč
Article

Abstract

This article deals with the theory and performance of a sensor for measuring thermal conductivity. The sensor, in the form of a small ball, generates heat and simultaneously measures its temperature response. An ideal model of the hollow sphere in an infinite medium furnishes a working equation of the hot-ball method. A constant heat flux through the surface of the ball generates the temperature field. The thermal conductivity of the surrounding medium is to be determined by the stabilized value of the temperature response, i.e., when the steady-state regime is attained. Error components of the sensor are discussed due to analysis of the deviations of the real hot-ball construction from the ideal model. The functionality of a set of hot balls has been tested, and the calibration for a limited range of thermal conductivities was performed. A working range of thermal conductivities of tested materials has been estimated to be from 0.06 W· m−1 · K−1 up to 1 W· m−1 · K−1.

Keywords

Hot-ball method Sensor Thermal conductivity Transient methods 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • L’udovít Kubičár
    • 1
  • Viliam Vretenár
    • 1
  • Vladimír Štofanik
    • 1
  • Vlastimil Boháč
    • 1
  1. 1.Institute of Physics SAVBratislavaSlovakia

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