Volumetric Digital Holographic Particle Tracking Velocimetry of High Reynold Number Turbulent Channel Flow

The three-dimensional nature of the turbulent flows necessitates a measurement technique that can capture the three-dimensional velocity field of all components in the measurement volume with high accuracy and high spatial resolution. The digital holographic piv/ptv is a promising technique that could achieve such measurement. This paper presents a three-component–three-dimensional digital holographic particle tracking velocimetry (3c-3d DHPIV) of a turbulent channel flow at reτ = 1,419. Taking a novel iterative predictive inverse reconstruction approach, both the number of detected particles and the accuracy of the measurement have a significant increase from the direct digital holographic reconstruction method, achieving higher spatial resolution and high fadelity measurement.