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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.v4.i3.30
pages 275-290

DISCHARGE COEFFICIENTS FOR PLAIN-ORIFICE EFFERVESCENT ATOMIZERS

S. Kevin Chen
Thermal Sciences and Propulsion Center, School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Arthur H. Lefebvre
Emeritus Professor, Cranfield University, Stratford, U.K., and Purdue University, W. Lafayette, IN, USA

ABSTRAKT

Discharge coefficients for plain-orifice effervescent atomizers are measured over wide ranges of air/liquid ratio, ambient air pressure, air injection pressure, and liquid properties. Three different discharge orifice diameters of 1.2, 1.6, and 2.0 mm are employed in conjunction with a constant mixing chamber diameter of 6.4 mm. The results obtained show that discharge coefficients are governed primarily by air/liquid mass ratio and air/liquid density ratio, with liquid properties playing only a minor role. It is also found that continuous increase in air/liquid mass ratio leads eventually to flow instabilities and a pulsating spray. The range of air/liquid ratios over which the spray remains stable can be extended by increases in flow velocity and/or air/liquid density ratio. An equation for estimating the maximum air/liquid mass ratio at which stable atomizer operation can be sustained is derived.


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