Abstract
The 3D characterization of bubbly flow is of wide application in engineering. A double pulse/double frame digital holographic particle tracking velocimetry (DHPTV) system is applied to measure the bubbles in an electrolytic cell. It is found that the actual bubble depth position should be corrected from the reconstructed position by multiplying the refractive index of the surrounding medium. Spherical bubbles and other irregular particles can be discriminated from their shapes. The three-dimensional position, particle size distribution, three-dimensional velocity of over 60,000 bubbles with size ranging from 25 μ m to 400 μ m are detected and analyzed with DHPTV, and statistics on bubble velocities in the y direction reveal bubble acceleration of 6.8 mm/s2.
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