メルトブローイング法によるセラミック繊維の生成(流体工学,流体機械)

概要

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Ceramic fibers that are used as heat-insulating material for high-temperature furnaces are produced by a process in which melted ceramic material is dropped into the path of a high-speed jet of air. The insulation performance of these fibers is improved when the length of the fibers is long, and when the material contains fewer spherical shots of ceramic that have solidified without fiberization. These fiber properties are strongly affected by the shape of the jet nozzle, but currently there is no logical scientific method for designing such nozzles. Empirical methods of design are limited to optimization, so more detailed information about the fiberization process needs to be obtained in order to design optimum nozzles. In this study, a high-speed camera and the schlieren method are used to obtain images of the molten ceramic material. In addition, the velocity distributions of the jet flow are measured. Images of the molten ceramic material show that the fiberization process is completed within a short streamwise region, where the flow immediately accelerates the molten ceramic material. Images taken using the schlieren method indicate the existence of strong turbulence in the jet flow, suggesting that this turbulence may be the dominant factor in the final process of fiberization.
社団法人日本機械学会の論文
2008-01-25