ABSTRACT Shell-and-plate heat exchangers have wide industrial applications for its excellent thermal performance with compact size, extensive temperature/pressure ratings and two-phase fluid flexibility. An in-depth study on the two-phase thermo-hydraulic behavior in the plate core is of utmost importance for its performance improvement. In this study, the flow patterns and pressure drop are experimentally investigated in a transparent circular plate with a corrugated sinusoidal shape. The flow patterns in both vertical downward flow and upward flow are defined respectively, i.e. bubbly flow, slug flow, film flow and churn flow in downward flow, while bubbly-slug flow, semi-film flow, film flow and churn flow in upward flow. By analyzing the relation between the two-phase multiplier and Lockhart-Martinelli parameter, a new correlation for the prediction of the frictional pressure drop is proposed.

中文翻译：

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壳板式换热器中的流动模式和压降

摘要 壳板式换热器因其优异的热性能、紧凑的尺寸、广泛的温度/压力等级和两相流体的灵活性而具有广泛的工业应用。深入研究板芯中的两相热工水力行为对其性能改进至关重要。在这项研究中，流动模式和压降在具有波纹正弦形状的透明圆板中进行了实验研究。分别定义了垂直向下流动和向上流动的流动模式，即向下流动的气泡流、段塞流、膜流和搅动流，而向上流动的气泡-段塞流、半膜流、膜流和搅动流. 通过分析两相乘数与Lockhart-Martinelli参数的关系，