Particle tracking velocimetry in liquid gallium flow around a cylindrical obstacle

Birjukovs, Mihails; Zvejnieks, Peteris; Lappan, Tobias; Sarma, Manoj K.; Heitkam, Sascha; Trtik, Pavel; Mannes, David; Eckert, Sven; Jakovičs, Andris

doi:10.1007/s00348-022-03445-2

Cited by 7 publications

(1 citation statement)

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“…In the absence of optical measurements, interrogation of flow in complex and opaque apparatuses can be achieved by the use of such techniques as magnetic resonance velocimetry [5] [6], radioactive particle tracking [7] [8], gamma ray tomography [9], ultrasonic velocimetry [10], and neutron radiography [11], among others, with each offering varying degrees of accuracy, spatial resolution, and volumetric flow reconstruction capabilities. In addition to these, positron emission particle tracking (PEPT) has emerged as a candidate technique for Lagrangian (i.e.…”

Section: Introductionmentioning

confidence: 99%

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

Wiggins,

Cabral,

Mafi

et al. 2024

Preprint

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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 to 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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