The Stokes number is a dimensionless quantity that describes the behavior of particles suspended in a fluid flow, defined as the ratio of the particle's relaxation time to a characteristic time scale of the flow. It helps in understanding how particles interact with the surrounding fluid and how effectively they can follow the fluid motion. A low Stokes number indicates that particles closely follow the fluid flow, while a high Stokes number suggests that particles have significant inertia and do not respond quickly to changes in the fluid dynamics.
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