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Solidification heat transfer characteristics of ammonia alum hydrate slurries treated with drag-reducing surfactants.

Number: pap. O24

Author(s) : SUZUKI H., FUJII M., FUDABA T., et al.

Summary

Solidification heat transfer characteristics of ammonium aluminum sulfate 12-water (ammonium alum hydrate) slurries treated with drag-reducing surfactants have been investigated in a tube flow. The concentration of ammonia alum hydrate in water was kept constant at 35 wt%, where the phase change temperature is 51°C. As drag-reducing surfactants, behenyl trimethyl ammonium chloride was used at 2,000 ppm and sodium salicylate as counter-ion suppliers was added to the slurry as the molar ratio of them to surfactants is 1.5. The temperature difference between the slurry and the cooling water inlets was changed from 5 to 15 K. From the results, it was found that the surfactant addition to slurries causes decrease of solidification heat transfer. However, the decrease rate is not so high compared with the results in the case without surfactants. As the pressure drop in the case of surfactant addition decreases remarkably, the heat transfer enhancement ratio was totally concluded to show much higher values than those in the cases of water and of a slurry without surfactants.

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Pages: 8 p.

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Details

  • Original title: Solidification heat transfer characteristics of ammonia alum hydrate slurries treated with drag-reducing surfactants.
  • Record ID : 30004991
  • 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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