Abstract
Two-phase flows are commonly found in many industries, especially in systems, where efficient and correct functioning depend on specific values of flow parameters. In thermal engineering and chemical technology the most popular types of two-phase mixture are gas-liquid or liquid-vapour mixtures. Bubbles can create in flow different structures and determine diverse properties of flow (velocity of phase, void fraction, fluctuations of pressure, pipe vibrations, etc.). That type of flow is difficult to observe, especially in liquid-vapour mixture, where vapour is being made by heating the medium. Production of vapour and nucleation process are very complicated issues, which are important part of two-phase flow phenomenon. Gas-liquid flow structures were observed and described with figures, but type of structure depends on many parameters. Authors of this paper made an attempt to simulate gas-liquid flow with air and water. In the paper there was presented specific test stand built to observe two-phase flow structures, methodology of experiment and conditions which were maintained during observation. The paper presents also the structures which were observed and the analysis of results with reference to theoretical models and diagrams available in literature.
Highlights
Two-phase flows are commonly found in many industries, especially in systems, where efficiency is determined by specific parameters of mixture flow
Tests taken according to described methodology enabled to observe and canvass two-phase flow structures for three stand configurations
Comparing the experimental results to regime maps developed for geometrically similar systems working under close net pressure lead to the conclusion that the test stand correctly fulfills its role
Summary
Two-phase flows are commonly found in many industries, especially in systems, where efficiency is determined by specific parameters of mixture flow. In thermal and chemical engineering the most popular types of two-phase flows are gas-liquid and liquid-vapour mixtures. In heat and power engineering two phase flows can be found in boiler pipes producing steam and in evaporators of refrigerating systems. Structure of two-phase flow has an important impact on heat and mass transfer, so it is important to observe and specify characteristics of structures. Productions of vapour and nucleation process are very complicated issues, which are important part of two-phase flow phenomenon. Gas-liquid flow structures were observed and described with figures, but type of structure depend on many parameters, such as diameter of the pipe, volume flow rate of each phase, void fraction and heat flow value [1]
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