Seeding (fluid dynamics)
This drives advancements in science and engineering, such as investigating airflow over aircraft wings, analyzing blood flow through arteries, and studying the dispersion of pollutants in the environment.
They act as tracers, making the invisible flow patterns visible when illuminated by light sources, such as lasers.
[1][2] The use of seeding techniques in fluid dynamics has a long history dating back to the early 20th century.
Initially, researchers used simple methods like injecting dye or smoke into fluids to observe flow patterns.
These early techniques provided a basic understanding of fluid behavior but lacked the precision needed for detailed analysis.
PIV, developed in the 1980s, revolutionized fluid dynamics research by allowing for the detailed measurement of flow velocities across entire fields of view, rather than just single points.
LDV, developed in the 1960s, provided a way to measure fluid velocity at precise points using laser beams and seed particles.
These advancements marked a significant evolution in seeding techniques, enabling researchers to conduct more accurate and comprehensive studies of fluid dynamics.
These techniques help researchers observe and analyze flow patterns, vortices, and other fluid behaviors in both experimental and educational settings.
The particles must be small enough to closely follow the fluid flow without affecting it, but large enough to be detected by imaging or laser systems.
The density, size, and material of the particles are carefully chosen based on the fluid properties and the specific technique used.
Researchers use seeding in wind tunnel tests to see and measure how air moves over wings, fuselages, and control surfaces.
For example, in cardiovascular research, small particles are added to fluids that mimic blood to visualize and measure flow patterns within arteries, especially at locations where blockages or aneurysms may occur.
This information is crucial for modeling the impact of industrial discharges, oil spills, or air pollution.
