An experimental study on the entry of spheres into a two-layer system of immiscible liquids

Doctoral thesis English OPEN
Tan, Benedict Chuan-Wei
  • Subject: TA

The phenomena, cavity formations and dynamics associated with rigid spheres entering into stratified, two-layer, oil-water systems were experimentally studied. The results were compared with available data for the corresponding type of cavities formed by spheres entering into single-phase, homogeneous liquids. The discussion and data analysis showed that the oil coating acquired by the spheres while passing through the oil layer, significantly modified the qualitative and quantitative aspects of the dynamics associated with cavity formation. In particular, ripple-like structures were discovered forming along the cavity walls, and such phenomenon was not known to exist when spheres entered into homogeneous liquids. The data analysis also showed that the ripples formed as a result of a two-dimensional instability, arising due to the shear between the oil layer coating the spheres and the surrounding water.\ud Meanwhile, phenomena not consistent with present understanding were observed during entries of steel spheres into sunflower oil and the two-layer, sunflower oil-water system. Further experiments suggested that such phenomena arose as a result of the surface conditions of the spheres, thereby highlighting the substantial influence the surface conditions of a body could potentially have on cavity dynamics. \ud
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