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ISSN Print: 1065-5131
ISSN Online: 1563-5074
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EXPERIMENTAL AND NUMERICAL STUDY OF TWO-PHASE FLOW IN A RECTANGULAR MINI-CHANNEL WITH SUDDEN EXPANSION STRUCTURE
ABSTRACT
The mini-channel heat sink is widely seen as a promising heat exchanger owing to its high efficiency and small size. In order to design an optimal structure and enable its operation at high efficiency, it is critical to predict the two-phase pressure drop for this type of channel. In this study, the pressure drop through a single rectangular mini-channel with sudden expansion is measured, and five primary flow patterns, bubble flow, slug flow, plug flow, jetlike flow, and annular flow, are observed by visualization experiments. A computational fluid dynamics model is also proposed for them. It is found that the pressure gradient on the bubble surface is very large, and the pressure drop of gas-liquid flow is closely related to the flow pattern. A new frictional pressure drop prediction model is also proposed using a modified parameter C with the effects of small channel diameter, viscosity, surface tension, mass velocity, flow pattern, and flow regime. Also, the new correlation has a better performance in predicting the two-phase frictional pressure drop within a wide range of mass flux.
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