Research Article
Studying the Effect of Some Surfactants on Drag Reduction of Crude Oil Flow
Table 2
Relative roughness and length of pipes used.
| Pipe inside diameter, m | Relative roughness, ε/d | Length of pipe with elbows, m | Length of straight pipe, m |
| 0.0508 | 0.000885 | 4.656 | 3 | 0.0254 | 0.001770 | 2.378 | 3 | 0.0191 | 0.002362 | 1.687 | 3 |
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