The Boltzmann Equation with an Average Force Field Caused by Anisotropic Momentum Changes

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概要

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• In non-equilibrium gases of low density, the angular distribution of momentum changes in binary collisions becomes anisotropic. As the result of the biased counteractions, an internal force is brought forth in the direction depending on the anisotropy. The effect of momentum changes biased from isotropic ones is introduced into the Boltzmann equation, here as a force field averaged over the distribution function. This average force field complements the rotational invariance in the macroscopic cross section used customarily in the collision term. The equation with the average force field is applied to the neutron transport problem in a medium. The results have shown that the average force field contributes to making the spatial distribution of neutron flux flatter and to growing a new mode which decays more slowly than the fundamental mode.

• 社団法人日本物理学会の論文
• 1976-12-15

著者

• Taji Yukichi

  Division Of Reactor Engineering Japan Atomic Energy Research Institute

• Taji Yukichi

  Division of Reactor Engineering, Japan Atomic Energy Research Institute

• TAJI Yukichi

  Division of Power Reactor Development, Japan Atomic Energy Research Institute

関連論文

• Stability of Vacancy Due to Noncentral Force Interactions in Diamond Structural Crystals
• The Boltzmann Equation with an Average Force Field Caused by Anisotropic Momentum Changes
• Two-Time Doublet Boltzmann Equation in Reactor Kinetics and Its Applications

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