Flow Over Weir Or Open Channel Apparatus
Product Code : EL-FML-11049
Quick answer: The flow over weir or open channel apparatus is a compact recirculating channel for finding the discharge coefficients of three interchangeable weirs: sharp-crested, broad-crested and ogee. A 1/2 HP monoblock pump drives water over the weir under test, and the outflow goes to a measuring tank or back to the sump. Lab Exports manufactures it in Delhi for engineering colleges, polytechnics and TVET institutes.
Specifications
| Component | Specification |
|---|---|
| Weirs | Sharp-crested, broad-crested and ogee shaped, interchangeable |
| Weir position | End of the channel |
| Pump | 1/2 HP monoblock centrifugal |
| Flow measurement | Measuring tank or calibrated water flow meter |
| Floor space | 2.5 x 1.5 m |
| Electrical supply | 230 V, 5 A, with earthing |
How the weir experiment is done
Weirs are the standard way of measuring flow in canals, rivers and streams, because a single head reading gives the discharge. The three profiles behave differently. Over a sharp-crested weir the nappe springs clear of the plate and Q = (2/3) Cd b sqrt(2g) H^1.5. A broad-crested weir is long enough for critical depth to form on the crest, giving about Q = 1.705 Cd b H^1.5 in SI units. An ogee weir follows the shape of a nappe, so water clings to it and it passes more flow for the same head.
- Fit the weir under test at the end of the channel.
- Start the pump, set a steady flow and let the channel level settle.
- Measure the head above the weir crest, upstream of the weir.
- Divert the outflow to the measuring tank and time a known volume, or read the flow meter.
- Repeat at several flows, then change the weir and repeat.
Plotting Q against H^1.5 for each weir gives the coefficient from the slope, and comparing the three lines shows which profile passes the most water at a given head.
Key features
- Three interchangeable weirs: sharp-crested, broad-crested and ogee
- Weir fitted at the end of the channel
- Outflow directed to the measuring tank or back to the sump
- Compact self-contained unit with a 1/2 HP monoblock pump
- Needs only 2.5 x 1.5 m of floor space and a 230 V, 5 A supply
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the flow over weir apparatus at its works in Laxmi Nagar, Delhi, and supplies it to engineering colleges, polytechnics and TVET institutes in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Fluid Mechanics Lab products
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- Orifice Mouthpieces Apparatus (EL-FML-11047)
- Free Force Vortex Apparatus (EL-FML-11046)
- Pitot Static Tube Set-up (EL-FML-11045)
- Metacentric Height Apparatus (EL-FML-11044)
- Impact of Jet on Vanes Apparatus (EL-FML-11043)
The full range is in the Fluid Mechanics Lab section of the Engineering Lab range.
Frequently asked questions
Which weirs come with the flow over weir apparatus?
A sharp-crested weir, a broad-crested weir and an ogee shaped weir, all interchangeable at the same position.
What services does the apparatus need?
About 2.5 x 1.5 m of floor space and a 230 V, 5 A electrical supply with earthing.
What is the price of the flow over weir apparatus?
Prices are not published on the website. Add the flow over weir apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-FML-11049 and the quantity, to receive a quotation.
Does Lab Exports manufacture the flow over weir apparatus?
Yes. Lab Exports manufactures the flow over weir apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-FML-11049.
Request a quote
Email [email protected] with the house code EL-FML-11049 and the quantity, or add the flow over weir apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
