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Assertion (A): A long packed bed approaches plug flow closely.
Reason (R): Its vessel Peclet number is the particle value multiplied by the large ratio of length to particle diameter.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the arithmetic: even a modest particle Peclet number becomes a very large vessel value once multiplied by several hundred particle diameters. Packed beds are close to plug flow in practice.

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