Dependence of spraying performance on the internal flow pattern in effervescent atomizers

The effect of the flow patterns inside the mixing chamber on the atomization performance of large-orifice (> 1.2 mm) effervescent atomizers for the low injection pressure range (< 4 bar) was examined experimentally. The transparent mixing chamber has a rectangular cross section (9 mm x 2 mm). The parameters tested were the air/liquid ratio (ALR), injection pressure, and the nozzle orifice diameter. Three different flow regimes were observed: bubbly, annular, and intermittent flows. In the bubbly flow regime, the discharged air/liquid mixture disintegrates into drops through the processes of bubble expansion and ligament breakup. On the other hand, in the annular flow regime, the liquid annulus disintegrates into fine drops by aerodynamic interaction due to high relative velocity between the core gas and the liquid film. In the intermittent flow regime, the bubble expansion/ligament disintegration and the annulus disintegration modes appear alternately. Transition criteria between the two-phase flow patterns within the mixing chamber are proposed based on the drift flux model. Finally, a drop size correlation encompassing all those flow regimes is proposed.
Publisher
BEGELL HOUSE INC
Issue Date
2001
Language
ENG
Article Type
Article
Keywords

GAS-LIQUID FLOW; 2-PHASE FLOW; VERTICAL TUBES; ATOMIZATION MECHANISM; CHANNELS; TRANSITION; CRITERIA; REGIMES

Citation

ATOMIZATION AND SPRAYS, v.11, no.6, pp.735 - 756

ISSN
1044-5110
URI
http://hdl.handle.net/10203/13155
Appears in Collection
ME-Journal Papers(저널논문)
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