variavel0=<b>Rubens Gallo</b> - gallo_rubens@hotmail.com Centro Federal de Educação Tecnológica do Paraná
<b>Alcides Padilha</b> - padilha@feb.unesp.br UNESP - UNIVERSIDADE DO ESTADO DE SÃO PAULO
<b>Vicente Luiz Scalon</b> - scalon@feb.unesp.br UNESP - UNIVERSIDADE DO ESTADO DE SÃO PAULO
<b>Abstract.</b> Within the industrial field, the falling liquid film, in a free surface, is very important for heat and mass transfer, inside a heat exchanger. The generation and distribution of steam, and the evaporation of sugar-cane broth, are good examples. The main advantage of this kind of device is the large faying surface of the fin liquid layer, which results in high rates of heat and mass transfer, in such a way that only a small flow of liquid in circulation is needed. Therefore, the amount of mass evaporated within a pre-established pipe length need to be determinate. In this study, the evaporation of a pure substance is considered, and it is taken for granted that the mass transfer occurs in the interface liquid-steam of the liquid film. Geometric irregularity in the solution domain is dealt with the use of the Landau Transform technique. The transformation cost is the increase in the non-linearity of the governing equations. The main objective of this study is to develop mathematical models for the assessment of the liquid film evaporation rate of a pure substance as a function of the design parameter and define the appropriate guideline for the conception of a compact heat exchanger.
<b>Keywords.</b> falling film, heat and mass transfer, film evaporation, compact heat exchanger.