Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [open-channel-flow]

19 questions
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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 misunderstanding about hydraulic jumps: if a jump can…
user2554
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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 sugar) and so I will run into a chance that the…
Davbog
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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 of environmental problems. How do I make sure that…
Jake Wrightson
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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 necessary to install a structure to allow the…
Pyrotechnical
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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 height of 4 ft and a width of 8 ft. At this…
james
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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 into another stream. A weir pool is located on the…
Nathan Lowe
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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 start and end node of the river/drain and we know the…
Graviton
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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 someone provide a basic insight how? Thanks.
James
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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 $50m$. In addition to the entry loss of…
Jake Wrightson
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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 Q (15 MGD) are known. The channel is concrete…
user10149
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Overflowing water flow between two prisms

I have system as seen in the figure. The pump will supply constant volumetric flow rate and the water will fill the first rectangular prism. I couldnt find the water height after water starts to overflow to the upper prism (open channel). The pump…
Ali Akbaş
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Tipped triangular weir

Can someone tell me what influence an angled wall has on the flow over a triangular weir compared to a "normal" vertical one if the wall is angled against the upstream as in the picture?
Nil
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How does decreasing the cross-sectional width of a channel impact steady flow?

The continuity equation states that for a constant mass flow rate, if the cross sectional area of a channel is decreased, then velocity is increased. What happens if the channel has high walls and is open to the environment, meaning that it's not an…
ARJ
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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 correlations for the boundary layer thickness as a…
Simon Henn
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determine if the flow is laminar or turbulent

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.
Physical
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