Effect of Free Surface Heat Transfer on Onset of Oscillatory Thermocapillary Flow of High Prandtl Number Fluid

DOI Web Site 参考文献8件
  • KAMOTANI Yasuhiro
    Department of Mechanical and Aerospace Engineering, Case Western Reserve University
  • WANG Li
    Department of Mechanical and Aerospace Engineering, Case Western Reserve University
  • HATTA Sayaka
    Department of Mechanical and Aerospace Engineering, Case Western Reserve University
  • SELVER Ramazan
    Department of Mechanical and Aerospace Engineering, Case Western Reserve University
  • YODA Shinichi
    National Space Development Agency of Japan

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Oscillatory thermocapillary flow is investigated experimentally in liquid bridges of high Prandtl number fluids. The effect of heat transfer from the liquid free surface on the onset of oscillations is investigated. The heat transfer is mainly due to conduction as well as the natural convection of air around the liquid bridge. The airflow in the present work is varied by varying the temperatures of the cold wall and the ambient air. It is found that when the free surface is nearly flat, the critical Marangoni number (Macr) varies substantially when the temperature of the cold wall or the ambient air is varied, but when the surface is highly concave, Macr is not affected appreciably. The present work shows that it is important to know the surrounding air condition when one compares various data for the onset of oscillations for liquid bridges with nearly flat free surfaces.

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