Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
Indexed in
LIMITATIONS OF THE IDEAL PHASE-DOPPLER SYSTEM: EXTENSION TO SPATIALLY AND TEMPORALLY INHOMOGENEOUS PARTICLE FLOWS
ABSTRACT
The effect of the single-particle constraint on the response of phase-Doppler instruments is determined for particle flows that are spatially nonuniform and time-dependent. Poisson statistics are applied to particle positions and arrival times within the phase-Doppler probe volume to determine the probability that a particle is measured successfully. It is shown that the single-particle constraint can be viewed as applying spatial and temporal filters to the particle flow. These filters have the same meaning as those that were defined previously for uniform, steady-state sprays [1], but in space- and time-dependent form. Criteria are developed for determining when a fully inhomogeneous analysis of a flow is required and when a quasi-steady analysis will suffice. A new bias due to particle arrival time displacement is identified, and the conditions under which it must be considered are established.
The present work provides the means to rigorously investigate the response of phase-Doppler measurement systems to transient sprays such as those that occur in diesel engines. To this end, the results are applied to a numerical simulation of a diesel spray. The calculated hypothetical response of the ideal instrument provides a quantitative demonstration of the regimes within which measurements can accurately be made in such sprays.
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Lee Sam-Goo, Effects of ALR and configuration ratio on turbulent structures in swirling flows, Journal of Mechanical Science and Technology, 22, 6, 2008. Crossref
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Gao J., Nishida K., Laser absorption-scattering technique applied to asymmetric evaporating fuel sprays for simultaneous measurement of vapor/liquid mass distributions, Applied Physics B, 101, 1-2, 2010. Crossref
-
Heinlein Jens, Fritsching Udo, Droplet clustering in sprays, Experiments in Fluids, 40, 3, 2006. Crossref
-
Heinlein J., Schulte G., Fritsching U., Guardani R., Mapping the structure of a liquid spray by means of neural networks, Chemical Engineering and Processing: Process Intensification, 46, 12, 2007. Crossref
-
Fritsching Udo, Droplets and particles in sprays: tailoring particle properties within spray processes, China Particuology, 3, 1-2, 2005. Crossref
-
Kulon Janusz, Zhang Lu, Roula M. A., Effects of system parameters on particle statistics in aerosol charge and size measurement in oscillatory electric fields, 2011 IEEE International Instrumentation and Measurement Technology Conference, 2011. Crossref
-
Li Xing-gang, Fritsching Udo, Spray Transport Fundamentals, in Metal Sprays and Spray Deposition, 2017. Crossref
-
Lizal Frantisek, Jedelsky Jan, Morgan Kaye, Bauer Katrin, Llop Jordi, Cossio Unai, Kassinos Stavros, Verbanck Sylvia, Ruiz-Cabello Jesús, Santos Arnoldo, Koch Edmund, Schnabel Christian, Experimental methods for flow and aerosol measurements in human airways and their replicas, European Journal of Pharmaceutical Sciences, 113, 2018. Crossref
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Zhang Lu, Kulon Janusz, Three-Dimensional Numerical Study of Particle Trajectory in Particle Charge and Size Analyzer Considering the Effects of System Parameters, IEEE Access, 7, 2019. Crossref