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Why does the mass transfer term rise with velocity?

  • A.Equilibrium between phases has less time to establish
  • B.The stationary phase is stripped at high flow
  • C.The carrier gas becomes turbulent
  • D.The column pressure drop increases

Answer: A

Partition takes time, and at high velocity a molecule is swept along before it has settled into equilibrium, so some molecules run ahead and others lag. Phase stripping, turbulence and pressure drop are not the mechanism. A term proportional to velocity, opposing one inversely proportional to it, is exactly what produces a minimum, and the balance point is the optimum flow. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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