Application of 3D Particle Tracking Velocimetry in Convection
Convection in large enclosures like theater halls, office rooms, and passenger compartments can be driven by the momentum flow of the inlet systems or buoyancy forces caused by internal heat sources. In many practical applications the overall flow field is clearly dominated by thermal convection and it is difficult to locate inlet devices by examining the large–scale flow structures. The characterization of these large–scale flow structures in ventilated rooms remains largely unresolved in experimental fluid mechanics.
In the present work large–scale circulation of air flow in a room has been investigated with three–dimensional particle tracking velocimetry (3D PTV). This technique has been refined for the large scales, enabling us to determine flow patterns, trajectories, and velocity vectors within the large Rayleigh–Bénard (RB) experiment “Barrel of Ilmenau”. The 3D PTV system consists of four cameras, two flash lamps, and an image recording and data processing system. Helium–filled latex balloons were used as tracer particles. First applications of the developed 3D PTV system showed different characteristic flow patterns of large–scale circulation outside the boundary layers.
KeywordsParticle Image Velocimetry Rayleigh Number Tracer Particle Convection Cell Laser Doppler Anemometry
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