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Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence
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Full Rotational Dynamics of Plastic Microfibers in Turbulence
Vlad Giurgiu1, Giuseppe Carlo Alp Caridi1, Marco De Paoli1,2
1Institute of Fluid Mechanics and Heat Transfer, <a href="https://ror.org/04d836q62">TU Wien</a>, 1060 Wien, Austria.
Physical Review Letters
|August 19, 2024
Summary
Microplastic fibers
Area of Science:
- Oceanography
- Fluid Dynamics
- Environmental Science
Background:
- Microplastic pollution is a growing global concern.
- Understanding microplastic behavior in marine environments is crucial.
- Rotational dynamics significantly influence microplastic motion, settling, and dispersion.
Purpose of the Study:
- To investigate the rotational dynamics of elongated microplastic fibers in turbulent ocean conditions.
- To provide experimental data on microplastic fiber spinning and tumbling rates.
- To correlate microplastic rotational dynamics with general turbulence features.
Main Methods:
- Optical Lagrangian investigations of microplastic fibers.
- Experiments focused on elongated, large aspect ratio, mildly curved plastic fibers.
- Measurement of rotation rates around longitudinal (spinning) and transversal (tumbling) axes.
Main Results:
- Collected homogeneous data on microplastic fiber spinning and tumbling rates.
- Demonstrated the link between fiber orientation and rotational dynamics.
- Explained observed rotation rates within the framework of turbulence.
Conclusions:
- Microplastic fiber rotational dynamics are key to their oceanic transport.
- Experimental data provides a basis for modeling microplastic dispersion.
- Turbulence significantly impacts the orientation and movement of microplastic fibers.
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