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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Multi-frame x-ray radiography and image tracking for quantification of expansion in laser-driven tin ejecta
Yuchen Sun1, Joshua Hammons1, Daniel Champion2
1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
The Review of Scientific Instruments
|December 13, 2024
Summary
Ejecta microjets exhibit less expansion than predicted by ballistic transport models. This study uses multi-frame synchrotron radiography to track jet dynamics, providing a foundation for future particle interaction research.
Area of Science:
- Experimental fluid dynamics
- High-velocity particle transport
- X-ray imaging applications
Background:
- Ejecta microjets, streams of micrometer-scale particles traveling over 1 km/s, are generated by shock interactions with surfaces.
- Understanding their transport dynamics is crucial for various scientific and engineering fields.
Purpose of the Study:
- To quantitatively analyze the transport dynamics and expansion of ejecta microjets over time.
- To compare experimental observations with theoretical ballistic transport models.
Main Methods:
- Utilized a multi-frame x-ray radiography platform with a synchrotron source for high-resolution imaging.
- Applied cross-correlation algorithms to track jet regions and quantify expansion using normalized area and areal density.
- Captured eight sequential images to observe jet evolution.
Main Results:
- Observed ejecta microjets expanding less than predicted by ballistic transport calculations.
- Quantified jet expansion over propagation time using image analysis techniques.
Conclusions:
- The study provides experimental evidence of reduced microjet expansion compared to ballistic predictions.
- Establishes a foundational methodology combining synchrotron radiography and image tracking for future particle dynamics research.
