(554i) Fluorescent Particle Streak Velocimetry Applied to Fast-Flowing Suspensions

Predictive constitutive equations that connect easy-to-measure transports properties (ex., viscosity and conductivity) with system performance variables (ex., power consumption and efficiency) are needed to design advanced electrochemical energy storage systems. In this work, we explore the use of fluorescent particle-streak analysis to directly measure the local velocity field of a particle-laden, pressure-driven flow. The fluorescent particle-streak analysis combines high-speed imaging with highly fluorescent particles to produce images that contain fluorescent streaks, whose length can be related to the local flow velocity. By capturing images throughout the sample volume, the three-dimensional velocity field can be quantified and reconstructed. We show that this information provides useful validation of constitutive equations determined using rheology and can reveal the role that flow heterogeneities play in macroscopic behavior and system-level performance. Our findings show that this technique is promising to develop a full understanding of complex, pressure-driven flows over a wide range of operating conditions.