Viscosities of molten alkali-metal bromides and iodides

Y. Sato, M. Fukasawa, T. Yamamura

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Viscosities of molten alkali-metal bromides and iodides, whose reported values are scattered, have been measured by the use of a capillary viscometer made of quartz which is newly designed to obtain a high precision. The viscometer consists of the quartz capillary with a funnel of the suspended level type, and the melt is sealed in it under vacuum. The total error in the measurement is estimated to be within 0.7% at high temperatures. Viscosities of all the alkali-metal bromides and iodides show similar values at a constant temperature. Viscous flow behaviors of all the alkali-metal halides are discussed based on the activation energy and the hard sphere model. The apparent activation energy increases with an increase in the melting temperature of the salt. The viscosity of the alkali-metal halide melt at the melting temperature increases as the ratio of hard sphere volume to hole volume calculated from the surface tension.

Original languageEnglish
Pages (from-to)1123-1142
Number of pages20
JournalInternational Journal of Thermophysics
Volume18
Issue number5
DOIs
Publication statusPublished - 1997 Sep

Keywords

  • Alkali halide
  • Bromide
  • Capillary viscometer
  • Iodide
  • Molten salt
  • Viscosity
  • Viscous flow

ASJC Scopus subject areas

  • Condensed Matter Physics

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