Shinku

Large Scale Vacuum Pumping System in Low and Medium Vacuum in Present and in Future

Masao YAMAZOE

1969 Volume 12 Issue 2 Pages 42-49
Published: February 20, 1969
Released on J-STAGE: April 23, 2010

DOIhttps://doi.org/10.3131/jvsj.12.42

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Erratum to : Negative Potential Modulation Characteristics of a Modulated Bayard-Alpert Type Ionization Gauge

1969 Volume 12 Issue 2 Pages 49
Published: 1969
Released on J-STAGE: January 28, 2010

DOIhttps://doi.org/10.3131/jvsj.12.2_49

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Application of Low Density Plasma Jet Wind Tunnel to Aerodynamics in Ionosphere

Goro KAMIMOTO, Michio NISHIDA

1969 Volume 12 Issue 2 Pages 50-57
Published: February 20, 1969
Released on J-STAGE: September 29, 2009

DOIhttps://doi.org/10.3131/jvsj.12.50

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In order to simulate the flight conditions in an ionosphere and to investigate a low density, high enthalpy, high speed flow with chemical reaction, a low density plasma jet wind tunnel has been constructed at the Department of Aeronautical Engineering of Kyoto University. Performance tests have been carried out by nitrogen and argon plasma jets. It is seen from the performance tests that the over-all Mach number and Reynolds number performance of this wind tunnel lies in the transition region. And it is shown that our plasma jet wind tunnel satisfies the conditions of a neutral dominated continuum flow in the aerodynamic flow regimes with which we are concerned in the ionosphere.

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The Effects of Agitator on High Vacuum Evaporation

Hajimu UYEHA, Yutaka HAGIHARA

1969 Volume 12 Issue 2 Pages 58-63
Published: February 20, 1969
Released on J-STAGE: September 29, 2009

DOIhttps://doi.org/10.3131/jvsj.12.58

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The evaporation rate of D. B. P. was measured by a pot still under high vacuum (2.0×10^-41.2×10^-2Torr) with or without applying agitator. The following results were obtained : (1) Uyeha's statements concerning the mechanism of high vacuum evaporation were supported by the curves in Fig. 3 in this study. D_s was observed as constant value (6.5×10^-4 mol/cm² sec), which was independent from the residual air pressure. (2) In regard only to the phenomena evaporation, the residual air pressure of 1.5×10^-3 Torr or below does not effect to the evaporation rate. (3) The effect of applying agitator (magnetic stirrer) was shown in Fig. 12, 13 and 14.

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