| 研究概要 |
I have been developing the dropping method, which is based upon hollow jet instability, to form hollow spheres. The hollow jet is generally called "compound jet". To develop that technique experimental and numerical works have been carried out.
Experiments : Hollow spheres are produced by an apparatus that consists of four main systems : a gas control system, a heating system, a coaxial nozzle mounted to a crucible, and a sphere formation chamber. Initially, we tested the technique with water. Then solder was used to produced hollov metal spheres. Next, we used germanium (Ge). Finally, we will produce hollow spheres of Silicon (Si)
Simulations : along with preparing experimental apparatus, simulations of breakup process of compound jets (critical phenomenon in the experiments) by using the front-tracking method were performed. The interfaces are represented by connected points that move on a stationary grid. Due to balance forces such as inertia, viscous force and interfacial tension force, the jet that issues from a coaxial nozzle eventually breaks up into drops. To understand the solidification process, we also simulated heat transfer and phase change using the same method.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Experiment : an apparatus for forming hollow spheres at high temperature were completed. Hollow water spheres were successfully formed. Then using the apparatus, we formed Ge spheres (This process was done at 1000 degree Celsius). RE simulations : I succeeded in simulating the breakup process that occurs in the experiments. Then, simulations of the solidification process of drops were also successfully done.
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