Combined 3D Scanning PIV and Scanning LIF for flow and phase transfer measurements around a melting particle
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Abstract
Interfacial flow and phase transfer around a melting solid particle were investigated with combined 3D Scanning PIV and Scanning LIF technique. Experiments were carried out with a spherical ice-particle, which was initially shock-frozen from water saturated with fluorescent dye. Flow in a water tank seeded with small tracer particles was investigated, when the ice-particle was released at the water surface in the center of the tank and the melting process began. A scanning light-sheet was generated with a polygonal mirror and flow was recorded with two high-speed cameras with a beam splitter plate. The cameras were equipped with different color filter such that cam#1 recorded only the clean water while cam#2 recorded the molten fluid generated by the heat transfer of the frozen fluorescent ice-particle. This allowed us to record the 3D flow and 3D concentration field simultaneous. The results showed the complexity of induced flow process by the heat/phase transfer and buoyancy interacting with the base flow in the water tank. A small swirl in the tank was enforced by buoyancy-induced vortex stretching and resulted in increasing particle rotation. This self-enforcing process generated a columnar vortex in the wake below the particle which underwent vortex breakdown. Fluid originating from the phase transfer process was accumulated in the vortex.