An Experimental Study on the Behavior of Liquid Film Surface after the Drop Impingement

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The impact of single water drop on a plane water surface was observed visually using a high-speed video camera to investigate the influences of impact angle and drop shape on the outcome of collision. In annular two-phase flow, the amount of secondary drops produced after the impact of a primary drop is important because of its contribution to the entrainment rate of drops and consequently the heat flux at the dryout of liquid film. In the present experiments, the primary drop diameter, impact velocity and impact angle were within 0.19-1.23 mm, 1.4-11.1 m/s and 36-89°, respectively; the film thickness was set at 2 mm. Within the experimental ranges tested, the minimum Weber number for the formation of secondary drops was approximately 200 and almost insensitive to the impact angle and drop shape, provided the absolute velocity of primary drop was used in evaluating the impact Weber number. However, the size of secondary drops was much larger and consequently much larger amount of secondary drops was produced at oblique impacts than at the normal impacts.
日本混相流学会の論文