Journal of The Japan Society of Microgravity Application

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Volume 6 , Issue 2

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[title in Japanese]

[in Japanese]

1989 Volume 6 Issue 2 Pages 13-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.13

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Diffusion in Liquid Metals and Space Experiments -with Some Comments on Swalin's Theory-

Mitsuo SHIMOJI

1989 Volume 6 Issue 2 Pages 15-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.15

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Recent microgravity experiments of Frohberg et al. indicate that diffusion coefficients in liquid metals increase in proportion to the square of absoloute temperature. Such interesting results of the temperature dependence would appear to be in accord with the prediction due to the fluctuation model of diffusion proposed by Swalin about 30 years ago. However, in this theory an inadequate assumption was adopted; in fact, the characteristic time in Einstein's equation used there was given in terms of the absolute reaction rate theory. The time scale estimated in this way is too short to define a diffusion coefficient in view of later studies on the microscopic atomic transport in liquids. Some remarks are given on basic points indispensable for the discussion of the temperature dependence of transport coefficients in liquids.

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Deflection Mechanism of Columnar Dendrite Due to Fluid Flow

Hisao ESAKA, Takayuki TAENAKA, Hirosi OHISHI, Shozo MIZOGUCHI, Hiroyuk ...

1989 Volume 6 Issue 2 Pages 20-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.20

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In order to investigate the deflection mechanism of columnar dendrite due to fluid flow the model experiments using succinonitrile-camphor alloy have been carried out. Deflection angle was found to increase with increasing flow velocity. The dendrite tip, which is parabolic in the stagnant liquid, asymmetrically deforms in the flowing liquid. Secondary dendrite arm spacing in the upstream direction is smaller than that in the downstream direction. No change in the morphology of dendrite was observed when the macroscopic thermal field was altered. The thermal and solutal fields around the columnar dendrite tip may be changed due to fluid flow. Since the change in the thermal field has little effect on the dendrite tip morphology, the change in the solutal field has an effect in a great deal on the dendrite tip morphology.

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Numerical Simulations of the Marangoni Convection

Toru SHIMADA

1989 Volume 6 Issue 2 Pages 26-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.26

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Basic equations, boundary conditions, and numerical solution procedures for the Marangoni convection are outlined. Two Marangoni convections, a flow in a floating zone and a flow around a bubble, are chosen as examples, and results obtained so far are given. The floating zone solution agrees well with other experimental and numerical investigations, while the bubble solution needs further investigations .

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Visualization of Solidification Process onboard Maser IV

Akira IWASAKI, Shunsuke HOSOKAWA, Mitsumori TANIMOTO, Isao KUDO, Shini ...

1989 Volume 6 Issue 2 Pages 32-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.32

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A Space Experiment by the TEXUS Rocket - Diffusion Experiments on Molten SbSnTe -

Minoru KANEKO, Misako KATAYAMA, Yukiya G. NAKAGAWA

1989 Volume 6 Issue 2 Pages 38-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.38

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InSb Melt Diffusion Experiment by TEXUS

Yuhji NAKATA, Minoru WATANABE

1989 Volume 6 Issue 2 Pages 42-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.42

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GaAs Solution Growth Experiment Aboard TEXUS

Yuichi SUZUKI, Shigeo KODAMA

1989 Volume 6 Issue 2 Pages 45-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.45

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Vapor Growth Experiment of InP in TEXUS Sounding Rocket

Yoshinori YUKIMOTO, Tadashi KIMURA,, Takashi NISHIMURA, Kazuo MIZUGUCH ...

1989 Volume 6 Issue 2 Pages 48-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.48

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Crystal Growth by the Use of a Temperature or a Salt Concentration Gradient. A Proposal from studies on Protein Crystal Growth

Mitsuo ATAKA, Michihiko ASAI

1989 Volume 6 Issue 2 Pages 51-
Published: April 30, 1989
Released: January 21, 2021

DOIhttps://doi.org/10.15011/jasma.6.2.51

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