For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as_________________?
Correct answer: D. d̅ 2
- A. d
- B. d2
- C. d4
- D. d̅ 2
Explanation
In the viscous, low-Reynolds-number part of packed-bed flow, the Ergun relation contains the particle-size dependence 1/d². Thus the pressure drop per unit length varies inversely with the square of sphere diameter, represented by option d.
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