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The head loss for a laminar incompressible flow through a horizontal circular pipe is h1. Pipe length and fluid remaining the same, if the average flow velocity doubles and the pipe diameter reduces to half its previous value, the head loss is h2. The ratio h2 /h1. is
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- 1
- 4
- 8
- 16
Correct Option: C
| Head loss, h ∝ | |
| D2 |
| ∴ | = |  |  | 2 | = 22 = 2 | |||
| h1 | D2 | uavg,1 |
| = 8 | |
| h1 |
