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The vessel dispersion number is defined as

  • A.the dispersion coefficient over velocity and length
  • B.the velocity times the length over the dispersion
  • C.the vessel volume itself expressed in litres
  • D.the variance divided by the mean value found

Answer: A

It is dimensionless and is the reciprocal of the Peclet number for the vessel. A value near zero means plug flow and a large value means intense back mixing. It is dimensionless by construction. Zero and infinity are the two ideal limits.

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