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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.v19.i7.60
pages 679-700

DISPERSION OF A POLYDISPERSE PARTICLE POPULATION FALLING THROUGH A SHEAR LAYER: RAW DATA

Simon J. Lewis
Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2BX, UK
John S. Shrimpton
Energy Technology Research Group, School of Engineering Sciences, University of Southampton, United Kingdom, SO171BJ

RESUMO

An experiment consisting of a polydisperse population of glass spheres, with a mean diameter of 30 μm, falling through the shear layer of a developing plane turbulent jet is reported. The aim is to provide robust data to validate existing and future Eulerian models of multiphase flow. The Reynolds number of the flow is ≈ 20,000, and the mean diameter of the glass particles coupled with the integral scale of this flow result in a Stokes number of 1. The measurement locations are within regions of two-way coupled flow. The measurements were obtained using laser and phase Doppler anemometry, and large sample counts were employed to ensure good statistical accuracy of higher-order moments. Single phase measurements reveal the turbulence characteristics are similar to other published work. An assessment is made of the conservation properties of the particle phase, which reveals the accuracy of the mass flux distribution to be typical of the phase Doppler anemometry method. The results show that the particle plume is "winnowed", and this permits the analysis of interphase transfer terms specific to different diameter distributions, to assess the accuracy of approximations published elsewhere. It is found that the accuracy of mean interphase transfer estimates, averaged over all particle diameters, provides poor accuracy, and some cases incorrect direction as well as magnitude.


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