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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2012006055
pages 603-626

SPATIALLY AND TEMPORALLY RESOLVED DISTRIBUTIONS OF LIQUID IN AN EFFERVESCENT SPRAY

Jan Jedelsky
Brno University of Technology, Faculty of Mechanical Engineering, Department of the thermodynamics and environmental engineering, Technická 2896/2, 616 69 Brno, Czech Republic
Miroslav Jicha
Brno University of Technology, Faculty of Mechanical Engineering, Department of the thermodynamics and environmental engineering, Technická 2896/2, 616 69 Brno, Czech Republic

ABSTRAKT

We employed planar laser-induced fluorescence (LIF) in combination with stereoscopic particle image velocimetry for imaging of concentration and flux fields of liquid phase in an effervescent spray. Light heating oil (LHO) was continuously atomized with the aid of pressurized air. The atomizer was operated at atomizing pressures of 0.1−0.5 MPa and gas-to-liquid ratio by mass (GLR) of 2%−50%. Basic spectral and time-resolved LIF characteristics of natural fluorescence of LHO, used for LIF based concentration measurements, are detailed. Instant distributions of concentration and flux were processed into time-average radial profiles and into radial profiles of normalized root-mean-square (rms) fluctuations. Time-average concentration profiles are bell shaped with maximum concentration at the spray centerline and exponential decrease with radial distance. Liquid concentration based half-angles vary with operation conditions between 7.9° and 12.2°. GLR causes narrowing of the spray angle while inlet pressure has an indistinctive effect. Time-average flux profiles resemble the concentration profiles but are narrower, with half-angles of 4.6°−6.4°. Radial profiles of rms fluctuations of concentration (and also flux) generally show a low value near the spray axis, increase with increasing radial distance, and show a maximum close to the spray edge. Overall values of the rms fluctuations are used as a measure of spray unsteadiness and are correlated with internal two-phase flow patterns predicted by a published flow map. The spray unsteadiness is relatively low when operated in annular flow regime and increases with change to bubbly flow regime. This confirms a direct link between the spray and internal flow.


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