Abstract

The falling film distillation has been successfully used in different distillation processes in which binary separation of liquid mixtures is needed. A longitudinal temperature variation of the distillation tube helps to reduce the height of the plants and to improve the energy efficiency of the distillation device as well. To provide the temperature profile over the distillation tube, two-phase loop thermosyphons technology with non-condensable gases is applied. The present work has the objective of presenting a simple mathematical model to describe the condenser temperature profile of a thermosyphon with NCG. The model is identical to the constant cross section fin equation and is employed to determine the condenser temperature profile considering the thermosyphon as a solid rod. The results are compared with experimental data and with two others models. It can be concluded that the analytical proposed model is able to predict the temperature profile along the condenser wall and the thermosyphon operation characteristics.