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Surfactants and fluid properties.

Author(s) : BEUTLER A., GREITER I., WAGNER A., HOFFMANN L., SCHREIER S., ALEFELD G.

Type of article: Article, IJR article

Summary

Investigations were made to clarify if the change in the surface tension and the viscosity of aqueous solution of lithium-bromide due to small amounts of surfactants and explain the observed enhancement of the heat-transfer coefficient in a falling film absorber with horizontal tubes. The study shows that the effect of the reduced surface tension alone cannot explain the changed heat-transfer behaviour for all investigated surfactants. This also applies to the viscosity. Measurements of this quantity which are presented show that the decrease of the viscosity is too small to be responsible for the enhancement. Effects creating turbulence, such as Marangoni convection, or the drop characteristics have to be taken into account. Further investigations, particularly of the surface tension, are necessary to understand the mechanism of enhancement due to surfactants.

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Format PDF

Pages: 342-346

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Details

  • Original title: Surfactants and fluid properties.
  • Record ID : 1997-1457
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 19 - n. 5
  • Publication date: 1996/06

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