Lagrangian Measurements of Two-Phase Pipe Flow Using Combined PIV/PTV

Measurements of two-phase particle suspension consisting of a liquid carrier phase and a solid particle phase are presented. Large diameter (d = [0.95−2.00] mm) and nearly neutral buoyant (ρp = 1050 kg m−3) particles are suspended in a turbulent fluid flow. The concentration of particles, φ ∼ 10−3, is slightly higher than previously reported in the literature. The carrier fluid is measured using particle image velocimetry (PIV), while the particle phase is measured with particle tracking velocimetry (PTV). There was found no evidence of turbulence modification within measurement accuracy, which is different form other studies using slightly heavier particles. Furthermore, challenges that arise with the use of combined PIV/PTV measurements at this flow regime and how these affects the measurements are discussed. GRAPHICAL ABSTRACT

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