Evaluation of effervescent atomizer internal design on the spray unsteadiness using a phase/Doppler particle analyzer

Journal Article · Wed Sep 15 04:00:00 EDT 2010 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.12.007· OSTI ID:21320532

Liu, Meng; Duan, YuFeng; Zhang, TieNan ^[1]

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1. School of Energy and Environment, Southeast University, Sipailou 2, Nanjing 210096 (China)

The purpose of this research was to investigate the dependence of effervescent spray unsteadiness on operational conditions and atomizer internal design by the ideal spray theory of Edwards and Marx. The convergent-divergent effervescent atomizer spraying water with air as atomizing medium in the ''outside-in'' gas injection was used in this study. Results demonstrated that droplet formation process at various air to liquid ratio (ALR) led to the spray unsteadiness and all droplet size classes exhibited unsteadiness behavior in spray. The spray unsteadiness reduced quickly at ALR of 3% and decreased moderately at ALR of other values as the axial distance increased. When the axial distance was 200 mm, the spray unsteadiness reduced dramatically with the increase in radial distance, but lower spray unsteadiness at the center of spray and higher spray unsteadiness at the edge of spray were shown as the axial distance increased. The spray unsteadiness at the center region of spray increased with the injection pressure. Low spray unsteadiness and good atomization performance can be obtained when the diameter of incline aeration holes increased at ALR of 10%. Although short mixing chamber with large discharge orifice diameter for convergent-divergent effervescent atomizer produced good atomization, the center region of spay showed high spray unsteadiness and maybe formed the droplet clustering. (author)

• OSTI ID: 21320532
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 6 Vol. 34; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
AERATION
AIR
ATOMIZATION
DESIGN
DISTANCE
DROPLETS
EVALUATION
Effervescent atomization
GAS INJECTION
INSTABILITY
PERFORMANCE
SPRAYS
Spray unsteadiness
TWO-PHASE FLOW
WATER