Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.540j&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
Prandtl-number Pr=26. Schilren technique coupling differential interferential microscope was employed to in-situ observe the convective flow. The test section was made of a heater chamber and a loop-shaped Pt wire heater. Optical evaluations in connection with Pt-Rh(10%) thermocouple (tc) measurements made it possible to get very the transition new ideas of flow structure in the considered convective system. In this article we deal with from steady spatial phenomena to oscillatory behavior. The convective flow occurs in the form of an axially symmetric pattern. In steady convection stage, the flow configuration appears as fish-tail shape which comprises of a main trunk and two branches. The width of the main-trunk decreases with temperature rising, and in the main-trunk the amplitudes of the hydrothermal waves increases. The critical Marangoni number Mac is 22433 for the transition to oscillatory convection, which agrees with a theoretically speculation Mac=2884Pr0.638 for high Prandtl number melt. The oscillatory convection occurs in the form of an axially symmetric pattern (ASP), that separates the flow configuration into two sectors. At one end of ASP the hydrothermal wave originates, at the other end of ASP it vanishes. The oscillatory frequency was obtained at 5-7 Hz. coordinate and the flexibility of the hydrothermal wave front is an important factor in causing the oscillation.
Jin W. Q.
Liang X. A.
Tsukamoto Kaoru
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