STP1083

    Small-Droplet Spray Measurements with a Scattered-Light Scanner

    Published: Jan 1990


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    Abstract

    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.

    Keywords:

    light-scattering instruments, sprays, drop-size distribution, atomization, Sauter mean diameter


    Author Information:

    Ingebo, RD
    Aerospace engineer and physicist, NASA Lewis Research Center, Cleveland, OH

    Buchele, DR
    Aerospace engineer and physicist, NASA Lewis Research Center, Cleveland, OH


    Paper ID: STP25413S

    Committee/Subcommittee: E29.03

    DOI: 10.1520/STP25413S


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