The heat rejection of industrial plants is often made with evaporative condensers as their choice meets energy efficiency requirements. In this work some numerical simulations of the evaporative condenser heat and mass transfer processes were carried out at the tube scale: 2D and 3D approaches were performed using the Ansys Fluent R.16.2 (VOF model). The time resolved characteristics of the film flow process were studied and two different types of flow (stable film and drops mode) were investigated, by varying the water-to-air mass flow ratio. The decrease of the water-to-air mass flow ratio was found that led to the film break-up into droplets. An experimental test rig was designed and built up for future validation works and to give designers new relations to quantify heat transfer performance depending on real working conditions.
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