Integrated positron emission particle tracking (PEPT) and X-ray computed tomography (CT) imaging of flow phenomena in twisted tape swirl flow

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Experiments in Fluids Pub Date : 2024-08-05 DOI:10.1007/s00348-024-03860-7
Cody S. Wiggins, Arturo Cabral, Adam Mafi, Jerel Houston, Lane B. Carasik
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Abstract

A combined positron emission particle tracking (PEPT) and X-ray computed tomography (CT) technique is presented, and its utility is demonstrated through investigation of flow in a pipe with twisted tape swirl insert with varying flow conditions (diameter-based Reynolds numbers 16,300–63,300). A description of this technique is given, as well as data handling practices used to relate geometric information captured by CT to fluid flow data gathered via PEPT. It is found that the CT component is readily capable of capturing the stainless steel insert geometry in this present system, but the use of combined plastic and metal materials leads to artifacts in imaging of the plastic surface. Nonetheless, CT data are related to PEPT flow measurements, and average velocity fields are calculated via a pseudo-framing and interpolation scheme and used to visualize and interrogate key flow phenomena within the system. Radial velocity profiles of the mean flow characteristics are seen to collapse to a nearly common form across all flow conditions considered. Helical vortices are seen propagating through the flow field, generated by bypass flow around the gap between the insert and pipe wall, with additional coherent secondary flow structures seen in the higher Reynolds number cases. These findings enhance the understanding of the mixing mechanisms in these swirl flows and encourage the continued development of PEPT-CT methodologies for 3D flow measurements in optically inaccessible systems.

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对扭曲带漩涡流中的流动现象进行正电子发射粒子跟踪(PEPT)和 X 射线计算机断层扫描(CT)综合成像
本文介绍了一种正电子发射粒子跟踪(PEPT)和 X 射线计算机断层扫描(CT)组合技术,并通过研究不同流动条件(基于直径的雷诺数为 16,300-63,300 )下带有扭曲带漩涡插入物的管道中的流动情况,展示了该技术的实用性。文中对该技术进行了描述,并介绍了用于将 CT 捕捉到的几何信息与通过 PEPT 收集到的流体流动数据联系起来的数据处理方法。研究发现,在本系统中,CT 组件很容易捕捉到不锈钢插入件的几何形状,但使用塑料和金属组合材料会导致塑料表面成像出现伪影。尽管如此,CT 数据还是与 PEPT 流量测量结果相关联,并通过伪取景和插值方案计算出平均速度场,用于可视化和分析系统内的主要流动现象。在所考虑的所有流动条件下,平均流动特征的径向速度剖面都会塌缩成几乎相同的形式。螺旋漩涡在流场中传播,由插入物和管壁间隙周围的旁路流产生,在雷诺数较高的情况下还能看到额外的连贯二次流结构。这些发现加深了人们对这些漩涡流中混合机制的理解,并鼓励继续开发 PEPT-CT 方法,用于光学不可及系统中的三维流动测量。
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来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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