Rheological characteristics of molten salt seeded with Al 2 O 3 nanopowder and graphene for concentrated solar power

Xin Xiao, Gan Zhang, Yulong Ding, Dongsheng Wen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

HITEC salt (NaNO 2 -NaO 3 -KNO 3 ) and solar salt (NaO 3 -KNO 3 ) are typical molten salts used in concentrated solar power. Adding nanoparticles is an effective method to improve the thermo-physical properties of pure salt. It is indispensable to experimentally study the rheological behaviours of salt seeded with nanoparticles, which can increase the specific heat capacity of pure salt. In this work, the viscosities of HITEC salt were measured with different shear rates in the temperature range of 200 C to 450 C firstly, while those of solar salt were measured in the temperature range of 250 C to 500 C. The experimental data showed reasonable agreement with the literature correlations, which verify the Newtonian behaviours of pure salts. The evolutions of the viscosities of nanocomposites in the same temperature range were measured and analysed, where the nanocomposites were synthesized with 1 wt.% or 2 wt.% Al 2 O 3 nanopowder and graphene, respectively. Results showed that the addition of Al 2 O 3 nanopowder had relatively little effect on viscosity, and the variations were about −35.4%~8.1% for the HITEC salt nanocomposites and −9.2%~68.1% for the solar salt nanocomposites. While graphene would apparently increase the viscosities of HITEC salt and solar salt, HITEC salt with the addition of graphene showed slight non-Newtonian fluid behaviour.

Original languageEnglish
Article number467
JournalEnergies
Volume12
Issue number3
DOIs
StatePublished - 1 Feb 2019
Externally publishedYes

Keywords

  • Aluminium oxide nanopowder
  • Graphene
  • Molten salt
  • Rheological behaviour

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