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Evaporation and diffusion of ammonia in a gaseous mixture of hydrogen inside a vertical open tube in laminar natural convection: a numerical model.

Author(s) : MARTINS G., PEREIRA J. T. V.

Summary

The work models the natural convection flow, heat and mass transfer resulting from the combined effects of thermal and mass diffusion occurring in the evaporator of a triple-fluid (ammonia-water-hydrogen) absorption refrigeration system. By using the boundary layer approximation, the differential equations of conservation of mass, species, axial momentum and energy become parabolic and can be solved using the finite-differences method marching downstream. The influence of different boundary and initial condition, besides geometric parameters is investigated. For each case, the axial and radial distributions of velocity, concentration and temperature are presented, as well as the total heat and mass fluxes along the evaporator.

Details

  • Original title: Evaporation and diffusion of ammonia in a gaseous mixture of hydrogen inside a vertical open tube in laminar natural convection: a numerical model.
  • Record ID : 1998-0237
  • Languages: English
  • Source: Ab-sorption 96. Towards sustainable technologies. Proceedings./ Ab-sorption 96. Vers les technologies durables. Comptes rendus.
  • Publication date: 1996/09/17
  • Document available for consultation in the library of the IIR headquarters only.

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