Open channel flow meters measure level flow rate and total volume of water flowing through weirs flumes channels and partially filled pipes.
Open channel flow meter types.
Open channel flow occurs when liquid flows in a conduit or channel with a free surface.
Partially filled pipes flow is also an example of open channel flow.
Open channel flow the flow of liquid through the open channel can be of several types like steady and unsteady flow laminar or turbulent flow or uniform or non uniform flow and finally sub critical critical and supercritical flow.
The flow meters use a non contact level sensor to detect the water level and then calculates the flow rate and volume using the manning equation and characteristics of the channel.
Open channels are those natural and man made structures through which water flows with a free surface.
Some of the more common methods currently in use to measure open channel flows are.
Examples of such structures include streams rivers irrigation ditches canals partially full pipes and water conveyance flumes.
It is subjected to atmospheric pressure.
A third way of measuring of measuring open channel flow applications and historically the most common is the use of weirs and flumes.
What is slightly confusing about this terminology is that the flow of liquids in partially filled pipes when not under pressure is also considered open channel flow.
Rivers natural and artificial canals streams channels etc.
Open channel flow meters measurement of liquid in open channels include v notch weirs and flumes.
Our open channel flow measurement section includes our microflow products which deliver accurate and efficient velocity flow measurement presented either as a stand alone device or as part of a complete area velocity flow meter system.
This type of flow meter allows for a reading of the flowrate to be calculated.
Types of open channel flow.
Open channel flowmeters most techniques used to meter flow in pipes are not applicable to flow in open channels.
Special devices such as the parshall flume are required.
Parshall flumes are one of the most widely used flumes for permanent flow monitoring.
These dam like structures or overflows allow for a limited or concentrated free flow of liquids based on the unique shape and size of the structure.
All manner of primary structures have been used the world over including v notches rectangular weirs parshall flumes h flumes crump weirs flat v and many other hybrid versions.
Measuring flow into a reservoir is a common application where open channel flow measurement comes into play.
Measurement of flow whether it s liquid or solid.
The parshall flume is an economical and accurate way of measuring the flow of water in open channels and non full pipes.
