Gas-Particle Interaction Model Development in Plume Surface Interaction Erosion and Cratering

West, Jeffrey S.; Liever, Peter A.

doi:10.2514/6.2022-2321

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…Despite significant advances in the last 30 years from experiments and simulations, numerical and theoretical models of multiphase flows are still not suitable for predictive capabilities in many realistic applications. Current state-of-the-art point-particle Lagrangian models coupled with an Eulerian flow description can be used to simulate thousands to millions of particles at the expense of computational power [15], [16], [17], but these numbers are still far from practical real-life situations involving billions or trillions of particles [18], [19]. In addition, the fidelity of those simulations depends on the range of particle-fluid nondimensional parameters that dominate the two-way coupled interactions being modeled.…”

Section: Introductionmentioning

confidence: 99%

Millimeter-Wave Interferometry for Opaque Particle-Laden Flows

Rasmont

Al-Rashdan

Elliott

et al. 2023

IEEE Trans. Microwave Theory Techn.

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A novel method to measure the concentration of particles in optically opaque particle-laden flows is presented. This method is based on the principle of millimeter wave interferometry, using a fully-integrated frequency modulated continuouswave (FMCW) radar operating between 77 and 81 GHz to measure path-integrated particle concentrations between the radar and a reflector. The instrument is capable of quantitative, high-speed (20 kHz) path-integrated concentration measurements in dispersed multiphase flows with concentrations one to two orders of magnitude higher than those at reach with state-ofthe-art optical methods. The interferometer was demonstrated and calibrated for path-integrated number concentrations up to (4.36 ± 0.24) × 10 8 m −2 using glass microspheres with a mean diameter of 109.2 µm. Two independent measurements of particle size distribution (PSD) were performed using X-ray microtomography and dry sieving. The calibration setup relied on high-resolution particle shadowgraphy applied to individual thin particle streams and used multistreams superposition to reproduce large optical depths in a controlled particle-air mixture. The instrument exhibited excellent linearity and low error during the calibration, with a phase shift-to-number concentration slope of (1.378 ± 0.043) × 10 −7 m 2 , validating the measurement concept and paving the way for practical applications. The leading uncertainties are discussed, providing guidelines for exploiting the measurement concept without necessarily performing a direct calibration.

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