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Numerical study of heat and mass transfer in LiBr falling films and droplets.

Author(s) : SUBRAMANIAM V., GARIMELLA S.

Summary

The absorber is the most crucial component of the vapour absorption system and has the largest impact on its performance. Several models have been proposed in the literature to model the heat and mass transfer during absorption over horizontal tube banks. However, all of them make very simplistic assumptions about the flow profiles in the absorber. High speed flow visualization studies in the literature have shown that the flow occurs in the form of droplets and the formation and the detachment of these droplets and their impact on the tube has significant effects on the heat and mass transfer. Most absorption models in the literature neglect these flow modes and assume the solution to flow as a uniform film. This study attempts to numerically model the heat and mass transfer in the absorber taking the realistic drop-wise and wavy film flow patterns into consideration. The impact of these falling droplets on the tube causes the lithium bromide solution present in the film on the tube to mix and present newer regions of the solution for vapour absorption. The impact of the droplets also causes waves that propagate axially over the liquid film on the tube. The mixing effect and the waves caused due to droplet impact play a very important role in the heat and mass transfer. Results obtained from this study will aid in better understanding of the vapor absorption process, and in the design of more efficient absorbers.

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Pages: 197-206

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Details

  • Original title: Numerical study of heat and mass transfer in LiBr falling films and droplets.
  • Record ID : 30001192
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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