Water Flow in Tubes - Reynolds Number
Reynolds Number in pipes transporting clean cold water
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Turbulent or laminar flow is determined by the dimensionless Reynolds Number.
The Reynolds number is important in analyzing any type of flow when there is substantial velocity gradient (i.e., shear.) It indicates the relative significance of the viscous effect compared to the inertia effect. The Reynolds number is proportional to inertial force divided by viscous force.
- Reynold's Number A definition of the Reynold's Number .
The flow is
- laminar if Re < 2300
- transient if 2300 < Re < 4000
- turbulent if 4000 < Re
The table below shows Reynolds Number for one liter of water flowing through pipes of different dimensions:
| Pipe Size | ||||||||||
| (inches) | 1 | 1 1/2 | 2 | 3 | 4 | 6 | 8 | 10 | 12 | 18 |
| (mm) | 25 | 40 | 50 | 75 | 100 | 150 | 200 | 250 | 300 | 450 |
| Reynolds number with one (1) liter/min |
835 | 550 | 420 | 280 | 210 | 140 | 105 | 85 | 70 | 46 |
| Reynolds number with one (1) gal/min |
3800 | 2500 | 1900 | 1270 | 950 | 630 | 475 | 380 | 320 | 210 |
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