2013 Fiscal Year Annual Research Report
| Project/Area Number |
12J00385
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
ブー チエーン バン 立命館大学, 総合科学技術研究機構, 特別研究員(PD)
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| Keywords | silicon / hollow jet / instability / coaxial nozzle / front-tracking method / compound jet / solidification / drop |
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| Research Abstract |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
Next steps : we will improve the present apparatus to form hollow Si spheres.
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Research Products
(5 results)
