Measurement of the thermal diffusivity of molten KCl up to 1000°C by the forced Rayleigh scattering method

Y. Nagasaka, A. Nagashima

Research output: Contribution to journalArticle

16 Citations (Scopus)


This paper describes measurement of the thermal diffusivity of molten KCl in the temperature range from 804 to 1030°C by the forced Rayleigh scattering method. In this contact-free optical measuring technique for the thermal diffusivity of liquids, a sample needs to be colored by the admixture of a dye for suitable absorption of a heating laser beam. The dye substances employed are CoCl2 and NiCl2, which were chosen through the experimental evaluation. The accuracy is estimated to be ±7% for molten KCl colored with NiCl2. The results converted to thermal conductivity show one of the smallest values among other previous data; the difference is a factor of four. The present study demonstrates the promising applicability of the forced Rayleigh scattering method to the measurement of high-temperature molten salts, which has never be attained by other conventional methods.

Original languageEnglish
Pages (from-to)923-931
Number of pages9
JournalInternational Journal of Thermophysics
Issue number6
Publication statusPublished - 1988 Nov 1



  • KCl
  • forced Rayleigh scattering method
  • high temperature
  • molten salts
  • thermal conductivity
  • thermal diffusivity

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this