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ABSTRACT
Cylindrical weirs (CW) due to high hydraulic performance, economic, and ease in construction are highly regarded. In this study, the discharge coefficient () of this structure and its ability to flow energy dissipation were investigated. The results showed that in the range of the relative head (Ratio of the head of flow over the crest to the diameter of the weir: H/D) between 0.15 and 2.0, the
varies between 1.0 and 1.4. In the same range of the H/D, such structures can dissipate the flow energy between 80% and 15%. The optimum value of the
for economic design purposes is about 1.3, which occurs in the range of the H/D between 0.5 and 0.7.
Notations
| µ(kg/m.s) | = | Kinetic viscosity |
| CCW(-) | = | Circular crested weirs |
| Cd(-) | = | Discharge coefficient |
| CW(-) | = | Cylindrical weirs |
| D(m) | = | Diameter of cylindrical weir |
| d(m) | = | Depth of flow at upstream of cylindrical weir |
| EDR | = | Energy dissipation ratio |
| EDR (-) | = | Energy dissipation ratio |
| Fr(-) | = | Froude number |
| Frw(-) | = | Weir Froude number |
| g(m/s2) | = | Gravity acceleration |
| H (m) | = | Head of flow over the crest |
| Hd(m) | = | Total head of flow at toe of cylindrical weir |
| Hu(m) | = | Total head of flow at upstream of cylindrical weir |
| q(m3/s/m) | = | Unit Discharge |
| R(m) | = | radius |
| Re(-) | = | Reynolds number |
| V(m/s) | = | Velocity of approached flow |
| Y(m) | = | Depth of flow over the crest at upstream |
| Y1(m) | = | Depth of flow at toe of cylindrical weir or before hydraulic jump |
| Y2(m) | = | Depth of flow after hydraulic jump |
| yc(m) | = | Critical depth of flow |
| Yp(m) | = | Depth of flow in pooled section |
| ρ (kg/ m3) | = | Mass Density of Flow |
Disclosure statement
No potential conflict of interest was reported by the authors.