21001 超音波浮遊装置を用いた流動可視化観測に関する研究(可視化・画像処理,OS.12 流体計測技術の新展開,学術講演)

概要

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Under the microgravity environment, products of new and high quality materials solidified into homogeneous crystal have been the subject of much interest. Usually, a large levitated droplet is utilized for such a containerless processing. However, surface instability and internal flow appear remarkably when the droplet become large. Elucidation of effect of surface instability and internal flow of the levitated droplet is required for the quality improvement of new material. In the present study, the experimental investigation of levitated droplet by ultrasound is conducted both under the normal gravity environment. The condition of ultrasound for stable levitation of droplets is evaluated. The internal flow structure in the levitated droplets is measured by two dimensional Particle Image Velocimetry (2-D PIV) and tree dimensional Particle Image Velocimetry (3-D PIV) techniques, and the dominant factor which induces the internal flow is discussed.
社団法人日本機械学会の論文
2008-03-13