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Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v2.i3.70
pages 319-366

ANALYSIS OF THE IDEAL PHASE-DOPPLER SYSTEM: LIMITATIONS IMPOSED BY THE SINGLE-PARTICLE CONSTRAINT

Christopher F. Edwards
Thermosciences Division, Department of Mechanical Engineering, Stanford University, Stanford, CA, USA
K. D. Marx
Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551-0969, USA

RESUMO

This article explores the effects of particle statistics on the ability of a phase-Doppler system (or any single-particle diagnostic) to make accurate measurements of complex particle flows. This is accomplished by analyzing the response of an ideal phase-Doppler system to a postulated particle flux. The ideal system defined here senses particles of all sizes and velocities with perfect accuracy, but is subject to one constraint: In order for a measurement to be considered valid, there must be only one particle in the probe volume at a time. A consequence of this constraint is that the measured flux of particles is similar to the true flux, but reduced by passage through two stages of filters. The first rejects particles for insufficient spacing and is controlled by a spatial Poisson process, while the second rejects particles for excessive residence time and is driven by a temporal Poisson process. The key filter parameters are the expected values of the number of particles in the probe volume and the number of particles entering the probe region during the residence time of a previous particle. Only if these values are kept below order 10−2 can the measured joint distribution function, flux rate, and derived quantities be assumed to reflect the true nature of the flow.


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