Why V notch is used?

Geosense® V-Notch Weirs and Tanks are used to measure seepage water flows in open streams, channels or tanks and are used mainly as part of Dam Safety Monitoring programs. The V-notch weir uses the principle of flow of water over a triangular or rectangular notched weir plate.

What is the purpose of V notch?

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 is V notch better than rectangular notch?

V-notch has high coefficientsdischarge compared to rectangular notch. V-notch gives more accurate results for low dischargecoefficientcompared to rectangularnotch. This is due to the space for the water to flow throughthe notch. For rectangular notch, the space of water it is constant for every depth.

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.

Where is triangular notch used?

What is the use of triangular notch? The triangular-notch, thin-plate weir is a convenient, inexpensive, and relatively precise flow-measuring instrument. It is frequently used to measure the flow of water in laboratories and in small, natural streams.

V Notch

Which type of notch is more advantageous?

Advantages of Triangular Notch(V-notch) over Rectangular Notch : For measurement of discharge in V-notch only one reading i.e. head(H) is required. For low discharge V-notch gives greater head than rectangular notch. Hence, accuracy is more for V-notch.

Where can we use V notch for flow measurement?

A v notch weir is simply a 'v notch' in a plate that is placed so that it obstructs an open channel flow, causing the water to flow over the v notch. It is used to meter flow of water in the channel, by measuring the head of water over the v notch crest.

What are the applications using notches?

The applications of notch include tanks, reservoirs, or any water storage devices that have a passage for water escape. Similarly, a weir is a notch on a large scale used to measure flows of rivers and canals. Apart from measuring, notch and weir are also used to regulate the discharge of small and large channels.

Why is triangular notch preferred?

A triangular notch or weir is preferred to a rectangular weir or notch due to the following reasons: The expression for discharge for a right-angled V-notch or weir is very simple. For measuring the low discharge, a triangular notch gives more accurate results than a rectangular.

Which notch is accurate?

The results of which are more accurate; rectangular notch or triangular weir. Explanation: The results of triangular notch are more accurate for low discharge.

What is calibration of V notch?

A Notch is regarded as an orifice with water level below its upper edge. Notch is made of a metallic plate and its use is to measure the discharge of liquids. These are used for measuring the flow of water from a vessel or tank with no pressure flow.

Why is V-notch used in Charpy?

The Charpy impact test, also known as the Charpy V-notch test, is a high strain-rate test that involves striking a standard notched specimen with a controlled weight pendulum swung from a set height. The impact test helps measure the amount of energy absorbed by the specimen during fracture.

Why V-notch is used in Charpy test?

The point is to promote the condition of brittle fracture. The notch here acts as a stress riser and favours the crack propagation.

Why do we use weir?

A weir is a small dam built across a body of water, such as a river. We use them to help control the flow of water. Weirs can help raise the water level so that boats can pass through, and they can also reduce the flow of water to prevent flooding.

What are the applications using rectangular and VEE notches?

Rectangular notches and Triangular notches are often used in water supply, wastewater and sewage systems.

Where the notches are used in fluid mechanics?

A notch may be defined as an opening provided in the side of tank or vessel such that the liquid surface in tank is below the top edge of opening. A notch may be defined as an opening provided in the side of tank or vessel such that the liquid surface in tank is below the top edge of opening.

Why is open channel flow important?

Open channels are a common method for transporting wastewater to and from wastewater treatment plants. Operators need accurate flow measurements in these open channels, so they can calculate how much water they'll be treating and discharging back into the environment.

Which type of weir is best?

Triangular weir:

This type of weirs are well suitable for measuring discharge over small flows with greater accuracy.

What is hydraulic weir?

A weir is a small barrier built across a stream or river to raise the water level slightly on the upstream side; essentially a small-scale dam. Weirs allow water to pool behind them, while allowing water to flow steadily over top of the weir.

What is weir box?

Definition of weir box

: a wooden or concrete box oblong in shape and open at both ends which is set lengthwise in a canal and in which a weir for the measurement of irrigation water is set crosswise.

What is trapezoidal notch?

A trapezoidal notch is a combination of a rectangular notch and two triangular notches as shown in figure. It is, thus obvious that the discharge over such a notch will be the sum of the discharge over the rectangular and triangular notches.

What is Izod and Charpy test?

Both Charpy and Izod impact testing are popular methods of determining impact strength, or toughness, of a material. In other words, these tests measure the total amount of energy that a material is able to absorb. This energy absorption is directly related to the brittleness of the material.

Why impact test is required?

The purpose of an impact test is to determine the ability of the material to absorb energy during a collision.