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Visualization of bubble behaviour and bubble diameter correlation for NH3-H2O bubble absorption.

Author(s) : KANG Y. T., NAGANO T., KASHIWAGI T.

Type of article: Article, IJR article

Summary

The objectives of this paper are to visualize the bubble behaviour for an ammonia-water absorption process, and to study the effect of key parameters on ammonia-water bubble absorption performance. The orifice diameter, orifice number, liquid concentration and vapour velocity are considered as the key parameters. The departing bubbles tend to be spherical for surface tension dominant flow, and the bubbles tend to be hemispherical for inertial force dominant flow. A transition vapour Reynolds number is observed at a balance condition of internal absorption potential (by the concentration difference) and external absorption potential (by the vapour inlet mass flow rate). As the liquid concentration increases, the transition Reynolds number and the initial bubble diameter increase. The initial bubble diameter increases with an increase of the orifice diameter while it is not significantly affected by the number of orifices. Residence time of bubbles increases with an increase in the initial bubble diameter and the liquid concentration. This study presents a correlation of initial bubble diameter with plus or minus 20% error band. The correlation can be used to calculate the interfacial area in the design of ammonia-water bubble absorber.

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Pages: 127-135

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Details

  • Original title: Visualization of bubble behaviour and bubble diameter correlation for NH3-H2O bubble absorption.
  • Record ID : 2002-1323
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 25 - n. 1
  • Publication date: 2002/01

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