SYMPOSIA PAPER Published: 01 January 1990

Small-Droplet Spray Measurements with a Scattered-Light Scanner


The flow through pneumatic two-fluid nozzles was investigated to determine the effect of nitrogen gas mass-velocity on the Sauter mean diameter of water sprays produced by the breakup of small diameter liquid-jets in high-velocity gas streams. Tests were conducted primarily in the aerodynamic-stripping regime of liquid-jet atomization. It was found that the loss of droplets as a result of vaporization had a marked effect on drop-size measurements. A scattered-light scanner was used to measure Sauter mean diameters, with diameters as small as 5 μm, which were inversely proportional to the nitrogen gas mass-velocity raised to the 1.33 power. The exponent 1.33 is the same as that predicted by atomization theory for liquid-jet breakup in high-velocity gas streams.

Author Information

Ingebo, RD
NASA Lewis Research Center, Cleveland, OH
Buchele, DR
NASA Lewis Research Center, Cleveland, OH
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Developed by Committee: E29
Pages: 67–76
DOI: 10.1520/STP25413S
ISBN-EB: 978-0-8031-5141-3
ISBN-13: 978-0-8031-1459-3