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.
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