TY - JOUR
T1 - Temperature fluctuations of the Marangoni flow in a liquid bridge of molten silicon under microgravity on board the TR-IA-4 rocket
AU - Nakamura, Shin
AU - Hibiya, Taketoshi
AU - Kakimoto, Koichi
AU - Imaishi, Nobuyuki
AU - Nishizawa, Shin Ichi
AU - Hirata, Akira
AU - Mukai, Kusuhiro
AU - Yoda, Shin Ichi
AU - Morita, Tomoji S.
N1 - Funding Information:
This study was supported by the Frontier Joint Research Program of the Japan Space Utilization Promotion Center under the direction of the National Space Development Agency of Japan. The authors thank Dr. Satoshi Adachi, Tomihisa Nakamura and Hiroto Samejima of the National Space Development Agency of Japan for their comments and Minoru Eguchi of NEC corporation for his skillful technical assistance. The authors also thank Takao Yokota, Akihiro Hirao, Yuichirou Ogata, and Katsuaki Matsui for developing the flight module HTF-II in the Space Development Department, NEC Corporation.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1998/3/1
Y1 - 1998/3/1
N2 - Temperature fluctuation measurements in a liquid bridge of molten silicon, which shows the Marangoni flow in highly super-critical condition, are performed in a half-zone configuration under microgravity on board a TR-IA-4 rocket and on the ground. In the microgravity experiment, two types of temperature oscillation are observed during the melting process of silicon and in the cylindrical half-zone melt. The former oscillation, which has a frequency of about 0.1 Hz during the melting process, has an antiphase correlation of temperature oscillation measured in thermocouples separated by 90° azimuthal angles. The latter oscillation in the cylindrical liquid bridge has no remarkable frequency; however, it tends to have the antiphase correlation in between thermocouples with 180° azimuthal angles. In the ground experiment, temperature fluctuations have a characteristic frequency of 0.2 Hz and there is an antiphase correlation of temperatures in thermocouples with 180° azimuthal angles by using the slender melt zone.
AB - Temperature fluctuation measurements in a liquid bridge of molten silicon, which shows the Marangoni flow in highly super-critical condition, are performed in a half-zone configuration under microgravity on board a TR-IA-4 rocket and on the ground. In the microgravity experiment, two types of temperature oscillation are observed during the melting process of silicon and in the cylindrical half-zone melt. The former oscillation, which has a frequency of about 0.1 Hz during the melting process, has an antiphase correlation of temperature oscillation measured in thermocouples separated by 90° azimuthal angles. The latter oscillation in the cylindrical liquid bridge has no remarkable frequency; however, it tends to have the antiphase correlation in between thermocouples with 180° azimuthal angles. In the ground experiment, temperature fluctuations have a characteristic frequency of 0.2 Hz and there is an antiphase correlation of temperatures in thermocouples with 180° azimuthal angles by using the slender melt zone.
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U2 - 10.1016/S0022-0248(97)00440-5
DO - 10.1016/S0022-0248(97)00440-5
M3 - Article
AN - SCOPUS:0032022298
VL - 186
SP - 85
EP - 94
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
SN - 0022-0248
IS - 1-2
ER -