Experimental Study on the Forced Rayleigh Scattering Method using CO2 Laser (1st Report, Development of the Free-Surface-Heating Technique and Preliminary Measurement of Molten Salts)

Yuzo Shimizu, Yuji Nagasaka, Akira Nagashima

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1 Citation (Scopus)


We have developed a new apparatus to measure the thermal diffusivity of liquids by the forced Rayleigh scattering method using a CO2 laser. In the case of employing the infrared wavelength laser as a heating source, it is less necessary to add dye substances in samples than with the previously used Ar+ laser. The purpose of the present study is to develop a practical forced Rayleigh scattering apparatus applicable to a wide range of substances and conditions. In the present study, we have invented a free-surface-heating technique which does not require any cell windows. In order to demonstrate the applicability of the present apparatus without adding dye substances, we have preliminarily measured the thermal diffusivity of molten KNO3 and a molten carbonate mixture (Li2CO3-Na2CO3-K2CO3=43.5-31.5-25.0 mol%) in the temperature range up to about 1000 K.

Original languageEnglish
Pages (from-to)3703-3708
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number556
Publication statusPublished - 1992 Jan 1



  • CO Laser
  • Forced Rayleigh Scattering Method
  • Molten Salts
  • Thermal Diffusivity
  • Thermophysical Properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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