ARTICLE:

• ON THE TRANSIENT HEAT AND MASS TRANSFER MODELING OF DIRECT CONTACT EVAPORATORS  download article

E. M. Queiroz
Curso de Pas-Graduacao em Tecnologia de Processes Quimicos e Bioquimicos (TPQB), Departamento de Engenharia Quimica, Escola de Quimica, Bloco E, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

ABSTRACT

The dynamical modeling to describe the transient heat and mass transfer processes during operation of direct contact evaporators is presented in this work, including a comparison to experimental results that were measured in a pilot plant, specially built to utilize combustion gas and water solutions, in the Thermofluid Dynamics Laboratory at COPPE/UFRJ. The dispersed phase temperature and solvent vapor concentration fields are described by non coupled diffusive models for spherical bubbles of radius, a, with angular symmetry assumption. This system of equations is solved by a functional method that yields the interfacial temperature and concentration transient behavior. An additional equilibrium surface condition is used to couple the heat and mass transfer mechanisms and to determine the mass evaporation flux at the interface. This modeling may be extended to apply to other geometric configurations and to the simulation of submerged combustion units as well.

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