Why is a V notch more efficient than a rectangular notch?
V-notch gives more accurate results for low discharge coefficientcompared to rectangularnotch. This is due to the space for the water to flow through the notch. For rectangular notch, the space of water it is constant for every depth.
Why V notch is preferable over rectangular weir as a flow measuring device?
It is used to meter flow of water in the channel, by measuring the head of water over the v notch crest. The v notch weir is especially good for measuring a low flow rate, because the flow area decreases rapidly as the head over the v notch gets small.
Why triangular notch is more accurate?
Answer: A triangular notch is also called a V- notch. A triangular notch gives more accurate results for low discharges than rectangular notch and the same triangular notch can measure a wide range of flow.
What are the advantages of vee notch?
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 more accurate?
Explanation: The expression for discharge for a right angled notch is easier than rectangular notch. 7. The results of which are more accurate; rectangular notch or triangular weir. Explanation: The results of triangular notch are more accurate for low discharge.
Where can we use V-notch for flow measurement?
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.
How does V notch measure flow?
What is a V notch weir? V notch weirs really are just that – a thin plate weir with a ‘V’ notch cut into it. The weir is placed to obstruct open channel flow and allow water to flow over the notch. This enables us to accurately measure the flow, by measuring the head upstream of the V notch.
Why the triangular weir is more suitable than a rectangular weir?
Triangular notch or weir is always preferred over a rectangular notch or weir due to the following reasons. 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.
What is the difference between weir and notch?
Basically there is no difference between a notch and a weir, except that a notch is of small size while a weir is of large size. A notch is usually made of metal plate whereas a weir is made of masonry or concrete. The bottom edge over which the water flows is called the sill or the crest of water the notch.
Why is triangular weir more suitable than a rectangular weir for measuring the discharge?
Why is V notch used in Charpy?
Charpy also found that the use of a notch in the test specimen was crucial in increasing the sensitivity and reproducibility of the measurement. His name became associated with the Charpy Impact Test for notch toughness because he spent years thoroughly investigating the parameters of the test.
What are the advantages of triangular notch over rectangular notch?
A triangular notch gives much more accurate results in low discharge conditions, as compared to the conventional rectangular notch. Also, only one reading (the head) is required to calculate the discharge rate, making calculations much easier. However, it cannot handle large volumes of flow rate accurately.