Estimation of heat transfer of a front-heating front-detection laser flash method measuring thermal conductivity for silicate melts at high temperatures

Hiromichi Ohta, Hiroyuki Shibata, Takeshi Kasamoto

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The thermal conductivity of silicate melts at high temperatures was determined by applying a differential three-layered laser flash method. In this method, the correction for radiative heat transfer was indispensable to obtain accurate thermal conductivity of the melts at high temperatures because, at 1 500 K, the uncorrected values are 20 to 40% larger than the corrected ones; further, the corrected values strongly depend on the absorption coefficient of silicate melts. Recently, we applied the front-heating front-detection laser flash method using a short initial time period immediately after laser pulse irradiation for silicate melts. This method was considered to be unaffected by the radiative heat transfer. However, the amount of the radiative effect on thermal conductivity was not estimated. On the basis of heat transfer theory, the temperature responses of this method were numerically calculated by considering radiative heat transfer. The result revealed that the radiative effect is less than 4.4% even at 1 743 K.

Original languageEnglish
Pages (from-to)434-440
Number of pages7
JournalIsij International
Volume46
Issue number3
DOIs
Publication statusPublished - 2006

Keywords

  • Conductive heat transfer
  • Laser flash method
  • Oxide melts
  • Radiative heat transfer
  • Silicate melts
  • Slag
  • Thermal diffusivity

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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