EXPERIMENTAL INVESTIGATION OF FLOATING MOTION CHARACTERISTICS OF OIL DROPLETS IN WATER
The floating motion characteristics of oil droplets are one of the important components in the study of migration and transformation characteristics of petroleum-based pollutants in water bodies.In this paper,the upward motion of a single oil droplet in a stationary water body was studied,and the trajectories,instantaneous velocities,shapes,and terminal velocities of oil droplets of different particle sizes were obtained,then the relationships between particle size and deformation degree,instantaneous velocity and trajectory,terminal velocity UT and particle size d,drag coefficient CD and Reynolds number Re were analyzed.It was found that the shape of oil droplets in the water body was mainly spherical and ellipsoidal,the deformation increased with the increase of particle size,but the overall deformation degree was low;the trajectory of oil droplets gradually changed from linear to S-shaped with increasing particle size,while the amplitude of horizontal oscillation gradually increased,but the effect of horizontal oscillation of oil droplets on the droplet vertical velocity can be negligible;the UT gradually increased to the peak with the increase of oil droplet size,and after passing the peak,the UT decreased slightly and then tended to be stable;the CD-Re relationship tended to gradually decrease,stabilize and then rapidly increase.Meanwhile,based on the experimental data and combined with Stokes'law,a set of CD-Re relations for silicone oil droplets at Re＜2000 was obtained.
oil dropletdeformationdrag coefficient CDReynolds number Reterminal velocity UT
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万方数据
