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4D spatiotemporal evolution of liquid spray using kilohertz-rate x-ray computed tomography
Optics Letters
|October 16, 2019
Summary
This study demonstrates four-dimensional x-ray computed tomography for imaging sprays. The novel technique reconstructs 3D liquid mass distribution over time, advancing spray analysis.
Area of Science:
- Fluid dynamics
- Imaging science
- Materials science
Background:
- Optically complex sprays present challenges for traditional imaging techniques.
- Accurate, high-speed characterization of spray dynamics is crucial for various industrial applications.
Purpose of the Study:
- To demonstrate a four-dimensional (4D) x-ray computed tomography (CT) system for imaging optically complex sprays.
- To reconstruct the three-dimensional (3D) liquid mass distribution within a spray over time.
Main Methods:
- Utilized a 4D x-ray CT system with three x-ray sources and high-speed detectors.
- Employed rotating anode x-ray tubes and intensified CMOS cameras operating at 20 kHz.
- Converted x-ray radiographs to equivalent path length (EPL) data, accounting for beam hardening.
- Reconstructed EPL data using algebraic reconstruction technique (ART) for 3D temporal imaging.
Main Results:
- Successfully demonstrated 4D x-ray CT for spray imaging.
- Achieved high-speed (20 kHz) data acquisition.
- Reconstructed time-resolved 3D liquid mass distribution of the spray.
Conclusions:
- The developed 4D x-ray CT system provides a viable method for analyzing complex spray dynamics.
- This technique enables quantitative, high-speed, 3D imaging of liquid distribution in sprays.
