Photorecording and control of transient parameters of the gas-liquid flow
The Kutateladze-Sorokin and Baker procedures and their application for the optimization of costs during gassy liquids transportation are addressed in the paper. An example of the Kutateladze-Sorokin complexes to determine the kind of the gas-liquid flow is also given. The Baker method of determining the kind of a horizontal two-phase flow is considered. The Beggs and Bril flow maps are shown. An experimental setup for determining flow parameters in transition from one flow to another is described. Vertically upward two-phase gas-liquid flow is implemented. Photographic recording of the dispersed flow (the liquid phase is practically absent), of the formation of the foam flow, of the plug flow (moments of the plug destruction), and of the process of forming the annular flow is made. A numerical analysis of changing the parameters of a two-phase flow when it changes is also made. For the plug flow to change over to the annular flow a change in the true speed of the gas phase by 18 % is required. For the plug flow to change over to the foam flow a change in the true speed of the gas phase by7 % is required while for the foam flow to change over to the dispersed flow a change in the true speed of the gas phase by 67 % is required The data obtained correspond to the values of Kutateladze-Sorokin and Baker maps. A possibility of synthesizing a control system for the implementation of a certain two-phase flow is demonstrated. The values of the pressure gradients in the test section of the condenser pipe are found. The data obtained are compared with the known two-phase flow medium maps. A possibility of implementing control system transitions from one flow regime to another for liquid mixtures of different nature is demonstrated. The obtained results make it possible to specify the parameters of an automatic control system intended to increase the cooling capacity of vapor compression refrigeration systems. Relative values of the true velocity of the gas phase corresponding to transitions from one flow regime to another in the gas-liquid flow are determined.