Abstract
This paper describes the displacement and deformation of a liquid drop exposed to an airstream. Experiments were conducted using a 60mm×150mm cross-sectional and 500-mm-long horizontal air-suction wind tunnel. Water was fed to a nozzle attached to a vibrator. Dripping uniformly sized drops from the nozzle or uniformly sized liquid drops produced by a longitudinal vibration of the nozzle were used. The displacement and deformation of liquid drops exposed to airstreams were measured from photographs obtained by triple exposure photography or consecutive photography. The liquid drops exposed to airstreams are deformed ; that is, the longitudinal drop diameter, which is the normal size to the airstream direction, the transverse drop diameter, which is the parallel size to the airstream direction, and the curvature of a drop at a stagnation point are changed. The projected area of a drop exposed to airstreams is expected to greatly influence such factors as the displacement, the drag coefficient, and the breakup time ; therefore, the longitudinal and the transverse drop diameters were measured in detail. As a result, the relationship between exposure time of a drop in airstreams and changing drop sizes was obtained.
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