Experimental Study of Thermocapillary Flow in The Half-Zone Liquid Bridge of Low Prandtl Number Fluid(Marangoni Convection Modeling Research, 2003-2004)

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概要

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• The experimental study on thermocapillary convection of low Prandtl number fl uid was carried out to understand transition behavior to oscillatory fl ow. The half-zone liquid bridge of molten tin was formed between hot and cold disks in high vacuum chamber (10-5 Pa). The three radiation thermometers were used to measure the free surface temperature at a different azimuthal location at the same time. In addition, the temperature distribution at interface between liquid bridge and cold disk was measured by using very fi ne thermocouples. In order to detect the transition point and to make clear the oscillation mode more precisely, the temperature measurement system was developed.It could be detected that the steady thermocapillary convection changes to oscillatory under certain condition. The observed phenomena of transition processes after the oscillatory onset were revealed by comparing to numerical result done by Imaishi et al.. The effect of aspect ratio (L/r) on critical Marangoni number was investigated. The critical Marangoni number decreases with increasing the aspect number. This behavior agrees with numerical simulation done by Imaishi et al. qualitatively except for region of smaller aspect ration. Since the echo signal from the tracer had the very small bad SN ratio, in order to raise the SN ratio, signal processing technique was examined. Consequently, the noise which originates in the shoe by the subtraction processing technique was removable. And the SN ratio could be improved by the addition processing by repetition measurement, and the SN ratio improved about 3 times by calculation supposing actual measurement. The A/D converter and the system controller were manufactured in the 3D-UV measurement unit.

• 宇宙航空研究開発機構の論文

著者

• Yoda Shinichi

  Japan Space Exploration Agency

• KOMIYA ATSUKI

  Institute of Fluid Science, Tohoku University

• MATSUMOTO Satoshi

  Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, ISS project office

• Komiya A

  Institute Of Fluid Science Tohoku University

• Hayashida Hitoshi

  Japan Space Exploration Agency

• Komiya Atsuki

  Japan Space Exploration Agency

• Natsui Hidesada

  Advanced Engineering Services Co. Ltd.

• Yoda Shinichi

  Japan Aerospace Exploration Agency

• Matsumoto Satoshi

  Japan Aerospace Exploration Agency Institute Of Space And Astronautical Science Iss Project Office

• Matsumoto Satoshi

  Japan Space Exploration Agency

• Matsumoto Satoshi

  Japan Aerospace Exploration Agency

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