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A realistic approach to modelling of LiBr-H2O smooth falling film absorption on a vertical tube.

Author(s) : ROGDAKIS E. D., PAPAEFTHIMIOU V. D., KARAMPINOS D. C.

Type of article: Article

Summary

A detailed model was developed for treating the 2-D water vapour absorption into an aqueous solution of LiBr, which flows over a vertical tube. Numerical predictions are presented for the spatial variation of solution temperature and concentration in the axial direction and within the LiBr-H2O falling film taking into account the flow and temperature rise of coolant inside the tube. Special care was given to the adequate description of the thermodynamic properties of superheated water vapour, which is treated as a real gas. Emphasis was also placed on the demonstration of the electrolytic nature of the aqueous solution, thus introducing the effect of variable heat of absorption on the temperature field. A parametric study for examining the effect of absorption pressure, solution mass flow rate and inlet coolant temperature on the absorption process was carried out implementing the model under laminar flow conditions. Good agreement with experimental observations was obtained for solution flows with Re lower than 150, thus demonstrating the predictive capability of the numerical model.

Details

  • Original title: A realistic approach to modelling of LiBr-H2O smooth falling film absorption on a vertical tube.
  • Record ID : 2004-2220
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 23 - n. 17
  • Publication date: 2003/12

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