Experimental system and experimental method for convective condensation in mixed working medium Marangoni condensation pipe

Abstract

The invention discloses an experimental system and an experimental method for convective condensation in a mixed working medium Marangoni condensation pipe. The experimental system comprises an experimental working medium circulating system, an auxiliary vacuumizing condensation system, an experimental section adjusting system, a loop cooling system and a data measurement and acquisition system, wherein an experimental working medium enters a steam generator from a liquid storage tank, and generates steam which enters an experimental section; the steam is cooled by means of an annular double-pipe heat exchanger, is condensed in an experimental pipeline and passes through a gas-liquid separator; and the incompletely condensed mixed working medium is completely cooled by means of a condenserand finally returns to the liquid storage tank. The invention further provides an experimental method of the experimental system. The experimental method can be used for visual experiment research ofthe Marangoni condensation flow pattern in the mixed working medium pipe, is used for acquiring a condensation heat exchange mechanism in the pipe, is suitable for research of various working media and different working conditions, can simply, conveniently and rapidly adjust system parameters, and provides reliable experimental data and theoretical support for industrial application of bead condensation and optimal design of the heat exchanger.

Description

technical field [0001] The invention relates to the technical field of convective condensation experiment research in the field of energy and power engineering, in particular to a convective condensation experimental system and an experimental method in a Marangoni condensation tube of a mixed working medium. Background technique [0002] During the condensation process of some mixed working fluids, there is a surface tension gradient on the free surface of the condensate, which causes the local fluid with low surface tension to flow to the local area with high surface tension, that is, the so-called "Marangoni convection" occurs, making the membrane The liquid film fluctuates, even tears, and finally forms a bead-like or bead-like condensation form, which is called Marangoni condensation or bead-like condensation. The mixed working fluids that can form Marangoni condensation include water-alcohol mixtures, ammonia water mixtures and other substances, and they all belong to ...

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Problems solved by technology

[0005] Chinese patent application publication number CN201310084890.4 discloses a condensation heat transfer experimental device that can realize the coupling of natural circulation and forced circulation, and can realize the condensation heat transfer outside the steam pipe containing non-condensable gas under the condition of natural circulation and forced circulation cooling Experimental research, as well as experimental research on the heat removal and flow characteristics of the natural circulation system under the condition of stable and changing heating power, but this experimental system cannot conduct in-pipe condensation experimental research, and the experimental working medium is pure steam, which cannot be used for mixing. Experimental Study on Coagulation of Marangoni

[0006] Chinese patent application publication number CN201710168093.2 discloses a steam condensation heat transfer experimental system in a horizontal tube with a wide subcooling degree containing multiple gases, which is suitable for studying the performance of the condensation heat exchanger in the containment filtration and discharge system of a nuclear power plant. Experimental research on condensation heat transfer of steam in horizontal tubes with multiple gases. This system is used to study the condensation heat transfer characteristics of steam flow in tubes containing non-condensable gases. It is suitable for the study of steam flow condensation heat transfer characteristics in horizontal tubes containing multiple non-condensable gases in other fields. , but it cannot be applied to the convective condensation experiment of the mixed refrigerant Marangoni in the tube, and the bead-like condensation formed by the Marangoni convection in the tube cannot be directly observed

Does not meet the needs of convective condensation experiments in Marangoni condensation tubes

[0007] In order to solve the lack of convective condensation experiment research in the existing Marangoni condensation tube, realize the visualization experiment research of Marangoni condensation flow pattern in the mixed working fluid tube, the research of condensation heat transfer and resistance characteristics, the research of condensation heat transfer mechanism and the optimization of condensation parameters

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