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All of the following increase axial dispersion in a tube EXCEPT

  • A.a laminar velocity profile through it
  • B.a short length to diameter ratio
  • C.a low flow velocity through it
  • D.a long tube at high Reynolds number

Answer: D

A long tube in turbulent flow is the closest practical approach to plug flow. The other three all spread the residence times and move the vessel away from the ideal. Turbulence and length both help. Laminar flow is the worst case of the four.

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