Abstract
This paper is concerned with the influence of the diameter of the blocking plate on the gas flux density distribution in a typical calibration chamber. It was found that, at small values of the blocking plate diameter, the shape of the gas flux density function is similar to the sinus function, with zero deviation from the mean value of the gas flux density at mid-height of the chamber. As the blocking plate diameter increases a discontinuity appears at the edge of the “shadow zone”. Until the discontinuity occurs on the side wall, the difference between the maximum and minimum relative gas flux densities is about 3×10 −4, then it grows to 3.7×10 −3 when the relative blocking plate diameter increases to 0.83 of the chamber diameter. If we confine our attention to the region between 0.33 and 0.67 of the whole chamber height, which is reasonable in practical terms, the maximum difference decreases to 6×10 −4. Even in this case, this difference is twice as great as that in the case of the chamber without or with the smallest reasonable blocking plate.
Published Version
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