What is the flow through pipe in an open channel?

• shafqut
In summary, the conversation discusses the flow velocity through a pipe reducing in diameter inside an open canal with a water velocity of 3m/s and water depth of 1.5m. The inlet diameter is 0.9m and the outlet diameter is 0.8m, with a small reduced diameter of 0.6m. The canal width is 6.096m and the nozzle is at the center and bottom of the canal. The flow characteristics are turbulent and it is mentioned that the velocity profile will not be linear. Further information is requested regarding the location of the nozzle and if the flow can be calculated using energy balance.
shafqut
I know this is easy but i need to know the flow velocity through a pipe reducing in diameter inside a canal.

the
water velocity is 3m/s
water depth is 1.5 m
the pipe is at the bottom
inlet diameter 0.9m
small reduced diameter 0.6m
outlet diameter = 0.8m

note: this is an open canal with velocity 3m/s
canal width is 6.096 m

At least tell me how this should be approached

Last edited:
Please provide more information regarding the location of nozzle wrt canal and how is the flow characteristics(laminar or turbulant)?

And as the nozzle is on open canal this property will also affect the flow velocity:

Though it is for pipe flow it will also affect canal flow so the velocity profile will not be linear.

Flow is turbulent..
the nozzle is at the center and at the bottom.
please mention any assumption you are taking .. can this be done using energy balance ?

1. What is the difference between flow through a pipe and flow in an open channel?

The main difference between flow through a pipe and flow in an open channel is the geometry of the flow. In a pipe, the flow is confined within a closed conduit, while in an open channel, the flow is unconfined and occurs over a free surface. This results in different flow characteristics and equations used to describe the flow.

2. How is the flow through a pipe in an open channel calculated?

The flow through a pipe in an open channel can be calculated using the Manning's equation, which takes into account factors such as the channel slope, roughness coefficient, and cross-sectional area of the pipe. Other methods, such as the Darcy-Weisbach equation, can also be used depending on the specific conditions of the flow.

3. What factors affect the flow through a pipe in an open channel?

The flow through a pipe in an open channel can be affected by various factors, including the slope of the channel, the roughness of the channel bed and walls, the cross-sectional area of the pipe, and the velocity of the flow. Additionally, changes in the flow rate, such as increases or decreases, can also impact the flow through the pipe.

4. How does the flow through a pipe in an open channel impact the surrounding environment?

The flow through a pipe in an open channel can have significant impacts on the surrounding environment. For example, changes in the flow rate can affect the erosion and sediment transport within the channel, which can impact aquatic habitats and water quality. Additionally, the flow can also influence the surrounding vegetation and ecosystem dynamics.

5. How can the flow through a pipe in an open channel be controlled or managed?

There are various techniques that can be used to control or manage the flow through a pipe in an open channel. These include constructing physical structures, such as weirs or dams, to regulate the flow. Another method is through the use of flow control devices, such as gates or valves, which can be adjusted to control the flow rate. Additionally, proper maintenance and management of the channel and surrounding environment can also help to regulate the flow through the pipe.

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