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首页> 外文期刊>Journal of enhanced heat transfer >EXPERIMENTAL AND NUMERICAL STUDY OF TWO-PHASE FLOW IN A RECTANGULAR MINI-CHANNEL WITH SUDDEN EXPANSION STRUCTURE
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EXPERIMENTAL AND NUMERICAL STUDY OF TWO-PHASE FLOW IN A RECTANGULAR MINI-CHANNEL WITH SUDDEN EXPANSION STRUCTURE

机译：矩形迷你通道与突然膨胀结构中两相流的实验与数值研究

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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 gasliquid 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.
机译：由于其高效率和体积小，迷你通道散热器被广泛被视为有前途的热交换器。为了设计最佳结构并以高效率使其操作，预测这种类型的通道的两相压降至关重要。在该研究中，通过测量突然膨胀的单个矩形迷你通道的压降，并且通过可视化实验观察到五个主要流动图案，气泡流动，泡沫流，塞流，喷射流动和环形流动。还提出了一种计算流体动力学模型。结果发现气泡表面上的压力梯度非常大，并且气液流动的压降与流动模式密切相关。还使用改进的参数C提出了一种新的摩擦压降预测模型，其效果小通道直径，粘度，表面张力，质量速度，流动模式和流动状态。此外，新相关性具有更好的性能，在宽范围的质量通量内预测两相摩擦压降。

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