JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
Other TitleFormation of Mach cones in a viscoelastic fluid
Author(jpn)三神, 史彦; 八木, 良明
Author(eng)Mikami, Fumihiko; Yagi, Yoshiaki
Author Affiliation(jpn)千葉大学; 千葉大学
Author Affiliation(eng)Chiba University; Chiba University
Issue Date2016-12-27
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料: 第48回流体力学講演会/第34回航空宇宙数値シミュレーション技術シンポジウム論文集
JAXA Special Publication: Proceedings of the 48th Fluid Dynamics Conference / the 34th Aerospace Numerical Simulation Symposium
Start page161
End page166
Publication date2016-12-27
AbstractMach cones created by a falling sphere are observed experimentally in a viscoelastic fluid. The fluid used is a dilute wormlike micelle solution of cetyletrimethylammonium bromide (CTAB) and sodium salicylate (NaSal) dissolved in water. The shear wave speed for the CTAB/NaSal solution is c approximately equal to 10 mm/s. A sphere falls through the fluid faster than the speed of shear waves. Mach cones are clearly observed in vorticity fields. They have a multiple-cone structure. The first cone is involved with forward shearing motion in the direction induced by the falling sphere, and it is followed by weaker cones with backward shearing motion accompanied by a relaxation of the initial shearing motion. The results suggest the importance of considering shear-wave-based Mach numbers that facilitates the understanding of a complex phenomenon associated with viscoelastic fluid flows.
Description会議情報: 第48回流体力学講演会/第34回航空宇宙数値シミュレーション技術シンポジウム (2016年7月6日-8日. 金沢歌劇座), 金沢市, 石川
形態: カラー図版あり
Meeting Information: 48th Fluid Dynamics Conference /the 34th Aerospace Numerical Simulation Symposium (July 6-8, 2016. The Kanazawa Theatre), Kanazawa, Ishikawa, Japan
Physical characteristics: Original contains color illustrations
Document TypeConference Paper
JAXA Category特別資料
NASA Subject CategoryFluid Mechanics and Thermodynamics
Report NoJAXA-SP-16-007

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