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Interfacial mass transfer and mass transfer coefficient in aqua-ammonia packed bed absorber.

Author(s) : SELIM A. M., ELSAYED M. M.

Type of article: Article, IJR article

Summary

A mathematical model was given to predict the mass transfer between flow of a mixture of ammonia vapour and water vapour and a flow of aqua ammonia solution at any interface within a packed bed absorber. The model used the molal mass and heat transfer coefficients in both the liquid and gas phases, the interface molal solution concentration, interface molal vapour mixture concentration, interface temperature, and the heat transfer coefficients in the liquid and gas phases in both sides of the interface. The heat transfer coefficient was corrected to account for the mass transfer. The model was also used to derive a convenient mass transfer coefficient which was based on the bulk mass concentration, not on the molal concentration, and not directly dependent on the concentration at the interface. To complete the model, mathematical correlations were derived for several thermodynamic and physical properties of aqua ammonia solution and vapour mixture. A computer program was developed to demonstrate the use of the model to predict the rate of absorption of ammonia vapour at an interface within the packed bed at various operating conditions.

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Pages: 263-274

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Details

  • Original title: Interfacial mass transfer and mass transfer coefficient in aqua-ammonia packed bed absorber.
  • Record ID : 1999-2843
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 4
  • Publication date: 1999/06

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