Dynamic surface deformation of cylindrical bridge of high Prandtl number fluid in oscillatory thermocapillary convection: Tspi measurement and G-jitter effect
利用統計を見る
Yokohama National University
Yokohama National University
Yokohama National University
Japan Aerospace Exploration Agency
出版者
宇宙航空研究開発機構
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構研究開発報告
雑誌名(英)
JAXA Research and Development Report: Marangoni Convection Modeling Research, 2003-2004
巻
JAXA-RR-04-027E
ページ
25 - 48
発行年
2005-03-31
抄録（英）
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) (now JAXA). 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 fluid and (2) the study of g-jitter effect on DSD in a simulated g-jitter environment. In the first work, a technique based on Temporal Speckle Pattern Interferometry (TSPI) is developed to make two-dimensional measurement of DSD in oscillatory thermocapillary convection. The technique is designed to have a resolution of better than 0.1 um 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 phase-unwrapping 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 are 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 non-harmonic g-jitters. It is concluded that the DSD measurement in the future ISS experiment is feasible even in the presence of g-jitter there.
Dynamic surface deformation of cylindrical bridge of high Prandtl number fluid in oscillatory thermocapillary convection: Tspi measurement and G-jitter effect
48708002.pdf
(3.1MB)
