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What does the eddy diffusion term arise from?

  • A.Slow transfer between the two phases
  • B.Compression of the carrier gas along the column
  • C.Different flow paths through a packed bed
  • D.Molecules diffusing along the column axis

Answer: C

In a packed column molecules take paths of different lengths between the particles, so they arrive spread out. Axial diffusion and mass transfer are the other two terms, and gas compressibility is a separate correction. This term vanishes in an open capillary, which has only one path, and that absence is a large part of why capillary columns are so much more efficient.

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