Soot particle size distribution functions in a turbulent non-premixed ethylene-nitrogen flame

W. Boyette, S. Chowdhury, W.L. Roberts
Flow Turbulence Combustion, 1-14, (2017)

Soot particle size distribution functions in a turbulent non-premixed ethylene-nitrogen flame

Keywords

Turbulent non-premixed flames, Soot, Particle size distribution function, Scanning mobility particle sizer, Differential mobility analyzer

Abstract

A scanning mobility particle sizer with a nano differential mobility analyzer was used to measure nanoparticle size distribution functions in a turbulent non-premixed flame. The burner utilizes a premixed pilot flame which anchors a C2H4/N2 (35/65) central jet with ReD = 20,000. Nanoparticles in the flame were sampled through a N2-filled tube with a 500- μm orifice. Previous studies have shown that insufficient dilution of the nanoparticles can lead to coagulation in the sampling line and skewed particle size distribution functions. A system of mass flow controllers and valves were used to vary the dilution ratio. Single-stage and two-stage dilution systems were investigated. A parametric study on the effect of the dilution ratio on the observed particle size distribution function indicates that particle coagulation in the sampling line can be eliminated using a two-stage dilution process. Carbonaceous nanoparticle (soot) concentration particle size distribution functions along the flame centerline at multiple heights in the flame are presented. The resulting distributions reveal a pattern of increasing mean particle diameters as the distance from the nozzle along the centerline increases.​​

Code

DOI: 10.1007/s10494-017-9802-5

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