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The axial dispersion model represents deviation from plug flow as

  • A.a fraction of the feed simply bypassing
  • B.a change in the rate of the reaction
  • C.a diffusion-like term on the bulk flow
  • D.a series of well mixed tanks in a row

Answer: C

The dispersion coefficient plays the role of a diffusivity and spreads the tracer pulse. It lumps together molecular diffusion, velocity profile effects and turbulent mixing into one parameter. The coefficient is fitted rather than looked up.

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