| 摘要 |
An orifice plate for use in a conduit through which fluid flows is defined by a central circular region having a radius R<SUB>0 </SUB>and a ring-shaped region surrounding the central circular region. The ring-shaped region has holes formed therethrough with those holes centered at each radius R thereof satisfying a relationship <?in-line-formulae description="In-line Formulae" end="lead"?>A<SUB>R</SUB>=a/(X<SUB>R</SUB>V<SUB>R</SUB><SUP>b</SUP>)<?in-line-formulae description="In-line Formulae" end="tail"?> where A<SUB>R </SUB>is a sum of areas of those holes having centers at radius R, X<SUB>R </SUB>is a flow coefficient at radius R, V<SUB>R </SUB>is a velocity of the fluid that is to flow through the conduit at radius R, b is a constant selected to make at least one process variable (associated with the fluid that is to flow through the conduit) approximately equal at each radius R, and a is a constant that is equal to (X<SUB>R</SUB>A<SUB>R</SUB>V<SUB>R</SUB><SUP>b</SUP>) at each radius R.
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