Particle-Based Flow Visualization

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Abstract

Several methods of flow measurement and flow visualization rely on the use of particulates to mark the fluid and make its motion visible, thereby rendering it amenable to optical study. In comparison to molecular markers like dyes, particle offer the unique capability of marker very small points in space which remain small and do not diffuse. In general, particle-based methods such as laser Doppler velocimetry (LDV) and particle image velocimetry (PIV) have been developed to a high degree, and they are used widely, especially for quantitative measurements. The properties of the particles must be managed correctly if the particle-based measurements are to be of the highest quality. The particles must follow the fluid motion accurately, they must scatter adequate light to produce high signal-to-noise ratio, and they must produce uniform, repeatable.

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