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Mathematical model of absorption on a horizontal film of lithium bromide water solution flowing on a cooled wall under the action of shear stress is numerically investigated in this paper. The shear stress on the film surface is set by the motion of co-current or counter-current surrounding saturated water vapor flow. It is known that the external shear stress is caused by the motion of surrounding saturated water vapor intensificate the process of non-isothermal absorption in comparison with the fixed-vapor regime. Our calculations have shown that at low values of heat flux the film temperature and vapor concentration in the solution downstream increases due to absorption. 1 Problem statement The necessity of heat and mass transfer intensification in the absorption chillers is caused by the limitations towards their size and consumption of materials. The use of thin liquid films just solves these problems. Our numerical modelling of the conjugated heat and mass transfer in absorption chillers focuses on the film flow process on cooling wall. The liquid film moving on a cooled horizontal wall under the action of co-current or counter-current vapor flow have been investigated. The liquid film of lithium-bromide water solution has been considered. The lithium bromide–water solution widely used in absorption refrigeration systems due to its effectivity especially for low heat temperatures [1]. The non-isothermal absorption takes place in the various energy devices [2,3]. The investigation of thin liquid film flowing down a vertical wall in the roll-wave regime in presence of heat and mass transfer through the free surface was presented in [4,5]. The absorption and desorption processes under the conditions, corresponding to the operating modes of thermal transformers are described in [6]. The analytical solution to the problem of conjugate heat and mass transfer in a laminar falling liquid film with a linear velocity profile is presented in [7]. The results of the numerical simulation of absorption and their comparison with the experimental data are presented in [8]. The results of experimental studies concerning the development of critical phenomena and structure formation in the process of boiling in falling films and during liquid cavitation were presented in [9]. Also, in [10,11] it was * Corresponding author: bartashevichmv@gmail.com

Numerical simulation of non-isothermal absorption in a liquid film moving over a cooled horizontal surface under the action of a gas flow