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Viscosity characteristics of slurries containing tetra-n-butyl ammonium salt semi-clathrate hydrate crystal and solution.

Number: pap. O22

Author(s) : HASHIMOTO S., KAWAMURA K.

Summary

Recently, slurries with phase change materials (hereafter, PCM) having latent heat have been received much attention as a high-density heat transportation system. So far, it has been reported that the thermal ability of slurries containing and their semi-clathrate hydrate: tetra-n-butyl ammonium bromide (TBAB) and fluoride (TBAF) as latent heat transport media is favorable. In this study, the viscosity characteristics of TBAB or TBAF solutions and their hydrate-slurries were measured at various concentrations of solutions by use of a stress-control-type rheometer with parallel-plate device. The apparent viscosity of both solution and hydrate slurries increases as the temperature decreases, which may be caused by the increase of solid (hydrate particle) fraction in solution. The hydrate slurries exhibit the behavior like pseudo-plastic fluid. The viscosity characteristics of these hydrate slurries can be treated by use of only solid fraction despite different unit-cell structure between TBAB and TBAF hydrates. In addition, a very small amount of surfactant drastically reduces the apparent viscosity of hydrate slurries, which may be caused by the electric repulsion of surfactant-adsorbed hydrate particles.

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Pages: 8 p.

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Details

  • Original title: Viscosity characteristics of slurries containing tetra-n-butyl ammonium salt semi-clathrate hydrate crystal and solution.
  • Record ID : 30004989
  • Languages: English
  • Source: 10th International Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Kobe, Japan, July 29-August 1, 2012.
  • Publication date: 2012/07/01

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