Measurements of the thermal conductivity of aqueous LiBr solutions at pressures up to 40 MPa

K. Kawamata, Yuji Nagasaka, A. Nagashima

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This paper describes absolute measurements of the thermal conductivity of aqueous LiBr solutions in the concentration range 5 to 15 m (molality), the temperature range 30 to 100°C, and the pressure range 0.1 to 40 MPa. The measurements have been performed with the aid of a transient hot-wire apparatus employing a thin tantalum wire coated with an anodic tantalum pentoxide insulation layer. In using the tantalum wire, a modification of the bridge circuit has been made to keep the electric potential of the wire always higher than the ground level in order to protect the insulation layer from breakdown. The experimental data, which have an estimated accuracy of ±0.5%, have been correlated in terms of the polynomials of concentration, temperature, and pressure for practical use. Also, it has been found that the pressure coefficient of the thermal conductivity decreases with increasing concentrations.

Original languageEnglish
Pages (from-to)317-329
Number of pages13
JournalInternational Journal of Thermophysics
Volume9
Issue number3
DOIs
Publication statusPublished - 1988 May

Fingerprint

Thermal conductivity
Tantalum
thermal conductivity
tantalum
wire
Wire
aqueous solutions
insulation
Insulation
Bridge circuits
polynomials
breakdown
Polynomials
Temperature
temperature
Electric potential
electric potential
coefficients

Keywords

  • aqueous solutions
  • high pressure
  • lithium bromide
  • thermal conductivity
  • transient hot-wire method

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Mechanics of Materials
  • Computational Mechanics
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this

Measurements of the thermal conductivity of aqueous LiBr solutions at pressures up to 40 MPa. / Kawamata, K.; Nagasaka, Yuji; Nagashima, A.

In: International Journal of Thermophysics, Vol. 9, No. 3, 05.1988, p. 317-329.

Research output: Contribution to journalArticle

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