What is the advantage of V-notch?
| Advantages | Disadvantages |
|---|---|
| Extensive build up space | |
| High requirements for the calming of the velocity field | |
| Most frequent errors | |
| low quality of cutting out of the notch, the crest is not sharp (the thicknes is higher than 1 mm ), the vertex of the notch is not smooth |
What is a triangular notch?
Triangular weirs are sharp crested thin plates with V-shaped opening (or notch). These plates are installed at the exit of a channel, tank, or basin in order to measure the real-time flow of water. For a given weir profile size and shape, the flow of water is related to the head of water at the weir.
What are the uses of notches?
A notch is a kind of opening (throughout the width) to the fluid flow, in which fluid flows through the bottom of notch. It is used to regulate the flow of fluid. The bottom end of the notch is generally made sharp so that it offers minimum resistance to the fluid flow (generally water).
What is the advantage of using a V-notch weir over the rectangular weir?
Because the V-notch weir has no horizontal crest length, the head required for a small flow through it is greater than that required with the other weir types. This greater head is an advantage because nappes of smaller discharges will spring free of the crest.
Which notch is preferable for low flow rates?
Explanation: The results of triangular notch are more accurate for low discharge.
Which notch is accurate?
What are the advantages of triangular notch over trapezoidal notch?
Triangular notch will provide more precise results during measuring low discharge as compare to result obtained from rectangular notch. Only one reading of H will be required for determination of discharge in case of triangular notch.
What are the advantages of triangular notch over rectangular notch?
:A triangular notch has certain advantages over the rectangular notch when used as a gauging device in a hydraulic laboratory. (i) The coefficient of discharge for a triangular notch is practically independent of the head.
What are the different types of notches?
Classification of Notches and Weir The notches are classified as; According to the shape of the opening: 1. Rectangular Notch 2. Triangular Notch 3. Trapezoidal Notch 4. Stepped Notch According to the effect of the sides of the nappe: 1. Notch with end contraction 2. Notch without end contraction or suppressed notch
What is the discharge for a right angle V-notch?
The expression for discharge for a right angle V-notch or weir is very simple. Ventilation of triangular notch is not necessary. Triangular notch will provide more precise results during measuring low discharge as compare to result obtained from rectangular notch.
How to calculate the discharge over a triangular notch or weir?
After securing the expression for discharge through the elementary horizontal strip, we will integrate the expression between the limit 0 to H and we will have the expression for the discharge over entire triangular notch or weir. dQ = Cd x Area of strip x Theoretical velocity.