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Volume 11, Issue 6
Displaying 1-5 of 5 articles from this issue
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Jungchung JUNG, Nobuo OHTANI, Keisuke KOBAYASHI, Hiroshi NISHIHARA1974 Volume 11 Issue 6 Pages 231-241
Published: June 25, 1974
Released on J-STAGE: April 18, 2008
JOURNAL FREE ACCESSA numerical method for solving the steady-state one-velocity neutron transport equation in x-y geometry is presented. It is based on the concept of combining the spherical harmonics theory with the discrete-ordinate method. The validity of the method is illustrated by several numerical computations using the TWOTRAN-PLXY code, formulated by modifying the ordinary discrete-ordinate code TWOTRAN-(x, y).
Through numerical studies, it is shown that the present method is effective for obtaining solutions of high accuracy, as well as for eliminating the ray effects present in the ordinary discrete-ordinate method. As for the techniques for accelerating the convergence of the iterative solutions, it is proved that the Chebyshev device works well for the present method while whole-system rebalancing is found to be less effective.View full abstractDownload PDF (688K) -
Wataru NAKAYAMA, Sampei USUI1974 Volume 11 Issue 6 Pages 242-262
Published: June 25, 1974
Released on J-STAGE: April 18, 2008
JOURNAL FREE ACCESSThermal convection and weak forced flows in a rotating cylinder were studied theoretically to find the mass velocity distributions in a gas centrifuge. Compressibility of the gas is taken into account in the form of a density stratification in the radial direction. First of all, a scaling analysis was made to verify the dominance of Coriolis force in the field of flow. The result of this analysis indicated that the body of the fluid in the centrifuge is composed of inviscid cores separated by a viscous layer concentric to the axis of rotation, and enveloped by other viscous layers lining the side and end faces of the cylinder. The transport of the gas from the feed ports to the discharge ports is made through these viscous layers.
The thermal convection has its largest component near the side wall in the form of a recirculating flow, and its pattern is controlled by the temperature distribution of the wall. These theoretical results were verified in part by an experiment devised to permit visual observation of the air flow in a rotating cylinder.View full abstractDownload PDF (1549K) -
Katsuichi IKAWA, Kazumi IWAMOTO1974 Volume 11 Issue 6 Pages 263-267
Published: June 25, 1974
Released on J-STAGE: April 18, 2008
JOURNAL FREE ACCESSSimultaneous deposition of carbon and zirconium from vapor produced by the reaction between methyl iodide vapor and zirconium sponge was studied with the application of a spouted bed constituted by a funnel carrying a charge of alumina microspheres, which were blown upward and held in dynamic suspension by a jet of the vapor and gases spouting from the funnel. The purpose of the experiment was to determine the conditions favorable for obtaining a coat of zirconium carbide-carbon alloy on the microspheres. Deposition of the vapor on the microspheres, leading to the formation of the carbon alloy coating, was found to take place at temperatures exceeding 1, 100°C. The C/Zr ratio of the deposited coat was found to increase with deposition temperature. The hydrogen concentration in the spouting gas affected both the deposition yield and the chemical composition of the deposit. Repeated use of the sponge was found to impair its performance due to deactivation by premature deposition of carbon.View full abstractDownload PDF (416K) -
Teruo FURUTA, Satoru KAWASAKI1974 Volume 11 Issue 6 Pages 268-269
Published: June 25, 1974
Released on J-STAGE: April 18, 2008
JOURNAL FREE ACCESSDownload PDF (159K) -
Kazuo AZEKURA, Tamotsu SEKIYA, Toshikazu TAKEDA1974 Volume 11 Issue 6 Pages 269-271
Published: June 25, 1974
Released on J-STAGE: April 18, 2008
JOURNAL FREE ACCESSDownload PDF (204K)
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