Questions tagged [open-channel-flow]

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How can I size a sump area to act as an energy dissipator?

I have a proposed stormwater design which will necessitate some very large diameter pipe installed near the surface to minimize constructability issues. However, near the end of the run, it will be ...
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0answers
31 views

Working out location of a hydraulic jump

This is the question I am working on: And here is part of the working i don't understand: I don't understand the process of plotting the profile - the little crosses marked on the diagram, how do ...
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2answers
83 views

Turbulent boundary layer development in channel flow

I'm currently working on my Bachelor's thesis about the numerical simulation of a turbulent air flow through a rectangular channel. As part of that I'd like to compare my results to empirical ...
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2answers
190 views

determine if the flow is laminar or turbulent [closed]

what would be the the type of flow if the water flows through stainless steel channel? would it be a laminar flow or turbulent flow. I assume the adhesive force of water to stainless steel is minimum.
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1answer
76 views

The mechanism of submerged hydraulic jump

Is there a mathematical analysis of the submerged hydraulic jump, such as under what condition it is formed, the speed and trajectory of the circular flow therein, etc.? Is there a good mathematically ...
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2answers
394 views

Open Channel flow with pressure losses - flow depth?

In a horizontal channel that feeds off a river, does the head/pressure loss due to friction, turns etc in the channel translate to a drop in the water level between its inlet and outler? If so, could ...
4
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3answers
86 views

How to make sure a pipe does not take all of the water from a stream?

I am trying to design a pipe which takes water from a river and transports it to a reservoir. However, I do not want my pipe to take all of the water from stream, because that will create all sorts ...
3
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1answer
217 views

Ideal funnel design for powders

I'm designing a funnel/bottle for a powder. My goal is to have all of the bottle's powder contents come out when inverted. However, the powder has a tendency to stick to itself (like flour or brown ...
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0answers
139 views

Determining the Steady Discharge Between Two Reservoirs

A uniform pipeline, $5km$ in length, $100mm$ in diameter and with a roughness size of $0.03mm$, conveys water between two reservoirs. The difference in water level between the reservoirs is $...
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1answer
237 views

Water Pump Thrust Calculation

If I have a water pump positioned horizontally where the diameter of the inlet and the outlet of the water is equal: Din = Dout. If the volume flow rate is know experimentally by measuring the time ...
2
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1answer
91 views

Difference in flow measurements in an open channel

I'm undertaking a civil hydraulics question. It involves the flow of water in an open channel down a river at $5m^3/s$ until the flow is split in two by a weir acting as a sluice gate allowing flow ...
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1answer
692 views

Why is pressure head ignored in open channel flow?

Also, what does this excerpt from Wikipedia mean However, since with open channel flow, the water surface is open to the atmosphere, the pressure term between two points has the same value and is ...
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2answers
2k views

Open Channel Flow with no slope

I'm struggling to confirm the Velocity in an open channel flow with 0 percent slope. Water enters the channel from an open pipe. The rectangular channel dimensions (66' Long x 3.33' W x 6.75' D) and ...
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1answer
101 views

How to model subcritical open channel flow?

I'm trying to model subcritical flow in an open channel with a side weir of certain small length at the middle of the main channel, so a certain amount of fluid discharges through the weir. I need to ...
4
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1answer
3k views

Where exactly will a hydraulic jump occur?

I know that an hydraulic jump can occur only when the Froude number is higher than 1 (supercritical flow), and I am familiar with the Bélanger equation. However, I feel like I have a fundamental ...
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2answers
3k views

How to calculate how much flow there is from a single source to multiple drains

Assuming that I have a water source ($Q$) that can flow into 3 drains ( $Q_1$, $Q_2$, $Q_3$): Assume that we know that The drain geometry is predetermined—we know the $x,y,z$ coordinates of the ...
2
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1answer
26k views

Reynolds Number for a Rectangular Duct

For a National Board Exam Review: Calculate the Reynold's Number, $Re$ for water at 20 °C flowing in an open channel. The water flowing at a volumetric rate of 200 gal/sec. The channel has a ...