For laminar flow in a pipe of circular cross-section, the Darcy's friction factor 'f' is -

- 1
  
  directly proportional to Reynolds number and independent of pipe wall roughness
- 2
  
  directly proportional to pipe wall roughness and independent of Reynolds number
- 3
  
  inversely proportional to Reynolds number and independent of pipe wall roughness
- 4
  
  inversely proportional to Reynolds number and directly proportional to pipe wall roughness

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