Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/28126
Title: Generation of Vorticity at a Free Surface of Miscible Fluids with Different Liquid Properties
Authors: LI YANGFAN
Keywords: Vorticity Generation Free Surface Miscible Fluids
Issue Date: 15-Sep-2008
Source: LI YANGFAN (2008-09-15). Generation of Vorticity at a Free Surface of Miscible Fluids with Different Liquid Properties. ScholarBank@NUS Repository.
Abstract: This thesis studies the generation of vortex rings by the impact of a drop onto a flat surface of a deep pool, for configurations where the drop and the pool are of different but miscible liquids. The work has discovered impact conditions which produce two ore more vortex rings. The vortex structures have been investigated for a wide range of liquid properties. The primary vortex rings are generated by the well-known coalescence motions in the neck between the drop and pool liquids, while the second vortex ring is generated during the closing of the impact crater. This second generation mechanism is quite sensitive to the exact shape-evolution of the crater. We have discovered that the maximum strength of the primary vortex ring is limited by the entrainment of an air-tongue from the crater. Numerous intriguing phenomena were observed for isolated impact conditions.
URI: http://scholarbank.nus.edu.sg/handle/10635/28126
Appears in Collections:Ph.D Theses (Open)

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