Falling film evaporation technology can be used in different applications such as water desalination, refrigeration and ar-conditioning absorption cycles, OTEC (ocean thermal energy conversion primer), petrochemical and chemical process industries. This technology still demands númerous studies due to the lack of a complete understanding, even some basic phenomena such as the liquid distribution problem, liquid film thickness behavior and the heat and mass transfer coefficients are subject of intense experimental and numerical studies. This work has analyzed experimentally the heat and mass transfer coefficient, falling film thickness and the distribution system in water vaporization over tubes. For that, it was built an experimental setup, which has been measured the following; (a) tube wall temperature, (b) falling film thickness, (c) mass flow rate, (d) electrical power supplied to the evaporator tube, (e) infrared images. The present work has been structured in two mean aspects; (1) heat and mass transfer coefficient evaluation, and 2) falling film thickness measurement. In both topics, the two heat transfer mechanisms were analyzed: sensible and latent heat transfer. For the first topic, it has been analyzed the local and the overall heat transfer. For the second part, the method used a novel mechanical configuration (leverage effect), which improves the micrometer reading with more precision to obtain the film thickness, which was compared with the Nusselt theory. The experimental data showed that there is a strong dependence between the heat and mass transfer coefficient with the film thickness in the laminar region (Reynolds between 160 e 950), implying a decreasing of the heat transfer rate when the Reynolds increased, due to that the film thickness imposes a greater thermal resistance. Moreover, the study found the film thickness with a divergence of 25 % when it was compared with the theoretical Nusselt film thickness
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