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Gas-phase flowrate effect on disintegrating cryogenic liquid-jetsTwo phase liquid and gaseous nitrogen flow in a pneumatic two fluid atomizer was investigated. Characteristic dropsize for cryogenic sprays were measured with a scattered light scanning instrument developed at NASA-Lewis. Tests were conducted primarily in the aerodynamic stripping regime of liquid jet atomization. At a sampling distance of bar-x =1.3 cm, the Sauter mean, D(sub 32), and volume median, D(sub v.5), drop diameters were measured and correlated with nitrogen gas flowrate, W(sub n), to give the following expressions: D sub 32 to the -1=210W(sub n) to the -1.33 and D(sub v.5) to the -1=150 W(sub n to the -1.33, where reciprocal diameters and gas flowrate are in cm (-1) and g/sec, respectively. The exponent 1.33 for nitrogen gas flowrate, W(sub n), is the same as that predicted by atomization theory for liquid-jet breakup in high velocity gasflow. When the spray was sampled at axial distances of bar-x=2.5 and 4.5 cm downstream of the atomizer, the exponent decreased to 1.2 and 0.9, respectively. This was attributed to the loss of small droplets due to their rapid vaporization.
Document ID
19900059840
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ingebo, Robert D.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Fluid Mechanics And Heat Transfer
Meeting Information
Meeting: International Congress of Fluid Mechanics
Location: Cairo
Country: Egypt
Start Date: January 2, 1990
End Date: January 4, 1990
Sponsors: Cairo Univ., Mansoura Univ., Virginia Polytechnic Inst. and State Univ.
Accession Number
90A46895
Distribution Limits
Public
Copyright
Other

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