Dynamic Surface Deformation of Cylindrical Bridge of High Prandtl Number Fluid in Oscillatory Thermocapillary Convection : Tspi Measuremet and G-jitter Effect(Marangoni Convection Modeling Research, 2003-2004)
スポンサーリンク
概要
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This report describes experimental studies conducted at Yokohama National University during 2003 JFY as a part of the Project Research on Marangoni Convection of National Space Development Agency of Japan (NASDA)^#. The work consists of (1) the development of a new measuring method for dynamic surface deformation (DSD, hereafter) of cylindrical bridge of high Prandtl number fl uid and (2) the study of g-jitter effect on DSD in a simulated g-jitter environment. In the fi rst work, a technique based on temporal speckle pattern interferometry (TSPI) is developed to make two-dimensional measurement of DSD in oscillatory thermocaplillary convection. The technique is designed to have a resolution of better than 0.1μm and be applicable to a curved liquid surface. Its performance is verified through a series of measurements targeting a flat mirror, a glass rod and a liquid bridge, all of which show dynamical surface displacement or deformation. The success of the measurement is due to the special phaseunwrapping algorithm devised for the measurement of oscillatory surface displacement or deformation. In the second work, effects of g-jitter on the measurement of DSD caused by the oscillatory thermocapillary convection in a liquid bridge is studied experimentally. A vibration table driven by a piezoelectric actuator is constructed to generate g-jitters of realistic amplitude and frequency spectra. A micro-imaging displacement meter is used to measure DSD in the presence of g-jitter. It is shown that the natural DSD in the oscillatory state of thermocapillary convection is well separated in the frequency domain from that caused by harmonic and nonharmonic g-jitters. It is concluded that the DSD measurement in the future ISS experiment is feasible even in the presence of g-jitter there.
- 宇宙航空研究開発機構の論文
著者
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Yoda S.
Japan Aerospace Exploration Agency
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Yoda S.
Japan Aerospace Exploration Agency (jaxa)
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Nishino K.
Yokohama National University
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Li X.
Yokohama National University
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Kanashima Y.
Yokohama National University
関連論文
- Investiagtion of Free Surface Heat Transfer Effect and Oscillation Mechanisms for Thermocapillary Flow of High Prandtl Number Fluid(Marangoni Convection Modeling Research, 2003-2004)
- Dynamic Surface Deformation of Cylindrical Bridge of High Prandtl Number Fluid in Oscillatory Thermocapillary Convection : Tspi Measuremet and G-jitter Effect(Marangoni Convection Modeling Research, 2003-2004)
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