Velocity measurement for two-phase flows based on ultrafast X-ray tomography
Velocity measurement for two-phase flows based on ultrafast X-ray tomography
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DOI：
10.1016/j.flowmeasinst.2015.06.006
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发表时间：
2015-12-01
影响因子：
2.2
通讯作者：
Hampel, Uwe
中科院分区：
文献类型：
--
作者：
Barthel, Frank;Bieberle, Martina;Hampel, Uwe
超快电子束 X 射线断层扫描仪 ROFEX 用于研究多相流。其功能原理使我们能够获得横截面流图像序列，显示流的局部衰减特性。因此，X射线CT图像主要通过X射线对比来揭示气体、液体和固体等流动成分的形状和界面。然而，从多相流中获取速度信息更加困难。在本文中，我们讨论提取粒子或界面以及连续相速度信息的不同方法。用于分散相速度测量，例如在气体-液体或气体-固体流动中，我们采用使用两个成像平面的基于互相关的技术。除了标准的互相关技术之外，我们还开发了一种方法和算法，它能够识别两个平面中的相同气泡，从而为我们提供独特的拉格朗日粒子相关速度信息。最后我们给出了使用 X 射线造影剂在连续液相中测量速度的示例。 (C) 2015 Elsevier Ltd. 保留所有权利。
The ultrafast electron beam X-ray tomography scanner ROFEX is used for the investigation of multiphase flows. Its functional principle allows us to obtain sequences of cross-sectional flow images, which shows local attenuation properties of the flow. Hence, the X-ray CT images mainly reveal the shape and interfaces of flow constituents, such as gas, liquid and solids via their X-ray contrast. It is, however, more difficult to obtain velocity information from multiphase flows. In this article we discuss different methods to extract information on the velocities of particles or interfaces as well as for continuous phase. For disperse phase velocity measurement, e.g. in gas-liquid or gas-solids flows, we employ cross-correlation based techniques using two imaging planes. Apart from the standard cross-correlation technique we developed a method and algorithm, which is capable to identify identical bubbles in the two planes giving us a unique Lagrangian particle-related velocity information. Eventually we give an example of velocity measurement in the continuous liquid phase using an X-ray contrast agent. (C) 2015 Elsevier Ltd. All rights reserved.