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The cipoletti weir functions as if it were a following notch without end contractions
- a)triangular notch
- b)trapezoidal notch
- c)rectangular notch
- d)parallelogram notch
Correct answer is option 'C'. Can you explain this answer?
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The cipoletti weir functions as if it were a following notch without e...
The "Cippoletti" weir is a trapezoidal weir, having 1 horizontal to 4 vertical side slopes, as shown in figure. The purpose of the slope, on the sides, is to obtain an increased discharge through the triangular portions of the weir, which, otherwise would have been decreased due to end contractions in the case of rectangular weirs.
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The cipoletti weir functions as if it were a following notch without e...
Cipoletti weir is a type of flow measuring structure commonly used in open channel flow applications. It consists of a rectangular notch with a V-shaped downstream end. The notch is designed to create a hydraulic jump, which helps in accurately measuring the flow rate of water passing over the weir.
The cipoletti weir functions similar to a rectangular notch without end contractions. Here's why:
1. Definition of a weir:
- Weir is a structure built across an open channel to measure or control the flow of water.
- It usually consists of a notch or an opening placed in the channel to create a flow restriction.
2. Types of notches used in weirs:
a) Triangular notch: It has a V-shaped opening with a triangular cross-section. The flow rate is determined based on the height of water over the notch.
b) Trapezoidal notch: It has a trapezoidal cross-section with sloping sides. The flow rate is determined based on the height of water over the notch.
c) Rectangular notch: It has a rectangular cross-section with vertical sides. The flow rate is determined based on the height of water over the notch.
d) Parallelogram notch: It has a parallelogram-shaped cross-section. The flow rate is determined based on the height of water over the notch.
3. Cipoletti weir:
- The cipoletti weir is a type of rectangular notch with a V-shaped downstream end.
- The V-shaped end helps in creating a hydraulic jump, which improves the accuracy of flow measurement.
- The hydraulic jump occurs when the flow transitions from supercritical to subcritical flow, resulting in energy dissipation and stabilizing the flow.
- The hydraulic jump helps to reduce the effect of velocity variations, turbulence, and end contractions, thereby providing more accurate flow measurement compared to a plain rectangular notch.
4. Functioning of a cipoletti weir:
- When water flows over the cipoletti weir, it creates a hydraulic jump at the downstream end.
- The height of water over the weir is measured using a ruler or a scale.
- The flow rate is calculated using established equations that relate the height of water to the flow velocity and the dimensions of the weir.
In conclusion, the cipoletti weir functions like a rectangular notch without end contractions but with the added advantage of a V-shaped downstream end, which creates a hydraulic jump and improves the accuracy of flow measurement.
The cipoletti weir functions similar to a rectangular notch without end contractions. Here's why:
1. Definition of a weir:
- Weir is a structure built across an open channel to measure or control the flow of water.
- It usually consists of a notch or an opening placed in the channel to create a flow restriction.
2. Types of notches used in weirs:
a) Triangular notch: It has a V-shaped opening with a triangular cross-section. The flow rate is determined based on the height of water over the notch.
b) Trapezoidal notch: It has a trapezoidal cross-section with sloping sides. The flow rate is determined based on the height of water over the notch.
c) Rectangular notch: It has a rectangular cross-section with vertical sides. The flow rate is determined based on the height of water over the notch.
d) Parallelogram notch: It has a parallelogram-shaped cross-section. The flow rate is determined based on the height of water over the notch.
3. Cipoletti weir:
- The cipoletti weir is a type of rectangular notch with a V-shaped downstream end.
- The V-shaped end helps in creating a hydraulic jump, which improves the accuracy of flow measurement.
- The hydraulic jump occurs when the flow transitions from supercritical to subcritical flow, resulting in energy dissipation and stabilizing the flow.
- The hydraulic jump helps to reduce the effect of velocity variations, turbulence, and end contractions, thereby providing more accurate flow measurement compared to a plain rectangular notch.
4. Functioning of a cipoletti weir:
- When water flows over the cipoletti weir, it creates a hydraulic jump at the downstream end.
- The height of water over the weir is measured using a ruler or a scale.
- The flow rate is calculated using established equations that relate the height of water to the flow velocity and the dimensions of the weir.
In conclusion, the cipoletti weir functions like a rectangular notch without end contractions but with the added advantage of a V-shaped downstream end, which creates a hydraulic jump and improves the accuracy of flow measurement.
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The cipoletti weir functions as if it were a following notch without end contractionsa)triangular notchb)trapezoidal notchc)rectangular notchd)parallelogram notchCorrect answer is option 'C'. Can you explain this answer?
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