Results of Experimental Studies of Heat-and-Mass Transfer Processes in a Two-Phase Closed Thermosyphon

The paper presents the results of an experimental study of heat-and-mass transfer in a closed two-phase thermosyphon (CTPT) designed to heat phosphates solutions for spray drying. The experimental studies were carried out on an operating installation in industrial conditions, which imposed certain limitations on the possible values of the influencing factors. During the experiment, the influence of a number of geometric and regime characteristics of the apparatus on its efficiency was investigated, and also the adequacy of the proposed earlier mathematical model of the apparatus [1] was checked. The comparison between the results of experimental studies and the calculation data based on the previously proposed mathematical model of heat-and-mass transfer processes in CTPT showed their good agreement. Findings of the research have enabled us to refine the values of the constant coefficients of the criterion dependence for determining the average value of the heat transfer coefficients from the flue gases to the evaporator of the thermosyphon, which are necessary for the engineering calculation of the apparatus. As a result of the experimental studies, we obtained the dependences of the CTPT performance on a number of influencing factors, such as the inclination angle of the thermosyphon; its fill ratio; the ratio of the diameter of the thermosyphon pipe to its length, as well as the intensity of heat supply. Results suggest that the value of 30° with respect to the vertical axis is the most effective value of the inclination angle of the pipe of the thermosyphon. Findings of the experimental studies show high efficiency of the apparatus

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