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Discussion

The choice of boundary conditions matters in the dispersion model because

  • A.the reaction rate changes at the boundary itself
  • B.the flow reverses direction at the inlet
  • C.the tracer decays at the vessel walls
  • D.open and closed vessels differ in the relation

Answer: D

A closed vessel has plug flow at inlet and outlet while an open one has dispersion across the boundaries. The distinction affects how a measured variance is converted into a dispersion number. Closed vessels are the more common case.

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