The solid plate across the choke with a through hole (orifice) which restricts fluid flow through the choke (see Fig. 1).
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| Fig. 1. Flow schematic of a choked flow by orifice plate |
In general means a hole in a pipe or other pipeline elements.
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See also
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Pipeline Engineering / Pipeline
Physics / Fluid Dynamics / Pipe Flow Dynamics / Pipe Flow Simulation / Pipeline Choke @model