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TECHNICAL PAPERS

Liquid Film Atomization on Wall Edges—Separation Criterion and Droplets Formation Model

[+] Author and Article Information
F. Maroteaux

Université Paris VI - LMP, 2 place de la gare de ceinture, 78210 St Cyr L’Ecole, Francee-mail: maroteau@ccr.jussieu.fr

D. Llory, J-F. Le Coz, C. Habchi

IFP, 1&4 avenue du bois préau, 92852 Rueil-Malmaison, France

J. Fluids Eng 124(3), 565-575 (Aug 19, 2002) (11 pages) doi:10.1115/1.1493811 History: Received July 11, 2001; Revised March 21, 2002; Online August 19, 2002
Copyright © 2002 by ASME
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References

Figures

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Configuration of film disturbance and stripping
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Amplitude of disturbance for film thickness of 25 μm
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Normal velocity of disturbance for film thickness of 25 μm
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Amplitude of disturbance for film thickness of 50 μm
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Normal velocity of disturbance for film thickness of 50 μm
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Amplitude of disturbance for film thickness of 100 μm
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Normal velocity of disturbance for film thickness of 100 μm
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Perturbation resulting from a difference of density
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Analogy with Rayleigh-Taylor instabilities
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Film configuration for a step angle of 135 deg (tsfilm: film thickness)
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Ratio between the bend radius and the film thickness versus step angle
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Atomization scheme (tsfilm: film thickness)
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Wind-tunnel configuration
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Typical image, condition with established stripping
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Optical arrangement for film thickness measurement on the step
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Measured film thickness for 80 m/s air velocity (springboard step case)
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Film behavior versus liquid flow rate. Left: below the limit flow rate, no film separation. Right: above the limit flow rate, part of the film is converted into droplets.
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Critical angle for 80 m/s air velocity (springboard step)
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Critical angle for 60 m/s air velocity (springboard step)
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Critical angle for 80 m/s air velocity (straight step)
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Critical angle for 60 m/s air velocity (straight step)
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Experimental view (springboard step), air velocity 80 m/s, fuel flow rate 0.1 cm3/s: some droplets
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Experimental view (springboard step), air velocity 80 m/s, fuel flow rate 0.5 cm3/s: established stripping
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Experimental view (springboard step), air velocity 60 m/s, fuel flow rate 0.09 cm3/s: rare droplets
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Experimental view (springboard step), air velocity 60 m/s, fuel flow rate 0.5 cm3/s: established stripping
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Experimental view (straight step), air velocity 80 m/s, fuel flow rate 0.16 cm3/s: rare droplets
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Experimental view (straight step), air velocity 80 m/s, fuel flow rate 0.24 cm3/s: established stripping
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Computation example: air velocity=80 m/s, fuel rate=0.5 cm3/s (numerical tunnel configuration: 20 cm long, section 5 cm per 5 cm; computation of droplets distribution are made at 6 cm along the tunnel axis)
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Initial distribution at the edge for two width parameters (q)
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Calculated distribution 60 mm downstream
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Measured distribution 60 mm downstream (air velocity of 80 m/s and fuel flow rate of 0.5 cm3/s)
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Droplet size distribution (springboard step), air velocity 80 m/s, fuel rate 0.5 cm3/s
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Droplet size distribution (springboard step), air velocity 80 m/s, fuel rate 0.29 cm3/s
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Droplet size distribution (springboard step), air velocity 60 m/s, fuel rate 0.5 cm3/s
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Droplet size distribution (straight step), air velocity 80 m/s, fuel rate 0.5 cm3/s

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