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Water flows through a 10 mm diameter and 250 m long smooth pipe at an average velocity of 0.1 m/s. The density and the viscosity of water are 997 kg/m3 and 855 × 10–6 Ns/m2, respectively. Assuming fully- developed flow, the pressure drop (in Pa) in the pipe is ____?
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- 6840 pascal
- 680 pascal
- 4844 pascal
- 9840 pascal
Correct Option: A
| Re = | ||
| μ |
| Re = | = 1166.081 ( laminar flow ) | |
| 855 × 10-6 |
| f = | = | = 0.054 | ||
| Re | 1166.081 |
| ∆p = | ||
| 2D |
| = | = 6840 pascal | |
| 2 × 10 × 10-3 |
