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Drag coefficient and strouhal number analysis of a rectangular probe in a two-phase cross flow

机译：两相错流矩形探针的阻力系数和Strouhal数分析

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摘要

In some case of laboratory and industrial applications, various kind of measurement instruments must be placed in a conduit, in which multiphase fluid flows. Vortex shedding for any immersed body in flow field is created with a frequency, which according to flow conditions such as flow rates, geometry of body, etc. may be constant or variable. Failure may happen, if this frequency is close to one of the natural frequencies of the instruments. These flows can play a significant role in long-term reliability and safety of industrial and laboratory systems. In this study, an Eulerian–Eulerian approach is employed to simulate Air-Water two-phase flow around a rectangular probe with different volume fractions (0.01-0.5) and Reynolds numbers (1000-3000). Two-phase flow characteristics around the probe have been analyzed numerically. The results show vortex shedding in all cases with distinct Strouhal number. In addition, results illustrate that shedding is intensified by increasing Reynolds number. In order to validate the results, fraction of inlet volume was set to zero, and drag coefficient and its relation with low Reynolds number (1000-3000) in single phase flow were compared to experimental and numerical results in published article. The results show a complete agreement between the simulation and available data.
机译：在实验室和工业应用的某些情况下，必须将各种测量仪器放置在多相流体在其中流动的导管中。对于任何浸没在流场中的物体，涡旋脱落的频率是一定的，该频率根据流动条件（例如流速，物体的几何形状等）可以是恒定的或可变的。如果该频率接近仪器的固有频率之一，则可能会发生故障。这些流量在工业和实验室系统的长期可靠性和安全性中可以发挥重要作用。在这项研究中，采用欧拉-欧拉方法来模拟围绕矩形探针的气水两相流动，该探针具有不同的体积分数（0.01-0.5）和雷诺数（1000-3000）。数值分析了探头周围的两相流动特性。结果表明，在所有情况下，涡旋脱落的Strouhal数均不同。另外，结果表明，通过增加雷诺数来加剧脱落。为了验证结果，将进气量的分数设为零，并将阻力系数及其与单相流中低雷诺数（1000-3000）的关系与已发表的实验和数值结果进行了比较。结果表明，仿真和可用数据之间完全吻合。

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