What is the discharge under a sluice gate?
Similar to an ordinary sluice gate, the discharge below gates located over sills in rectangular channels may be expressed as:(1) q = C d G 2 g ( H − Z ) where q is the discharge per unit width, H is the upstream flow depth above the channel bed, G is the gate opening, Z is the sill height above the bed, g is the …
How do you find contraction coefficient?
The coefficient of contraction is defined as the ratio between the area of the jet at the vena contracta and the area of the orifice. Cc = Area at vena contracta/Area of orifice. The typical value may be taken as 0.611 for a sharp orifice (concentric with the flow channel).
Can a sluice gate be calibrated to measure flow?
Sluice gates are used for flow measuring and control in irrigation channels. Free flowing sluice gates are simply calibrated while it turned to be more complicated when worked under submerged condition especially for multi-sluice gates.
What does a sluice gate measure?
Sluice gates are used for controlling and measuring flow rates in open channels and rivers, mainly in connection to hydro power plants. Sluice gate flow metering is often used to measure flow rate in open channels. Sluice gates are also often used to modulate flow.
Why is sluice gate used?
Sluice gates commonly control water levels and flow rates in rivers and canals. They are also used in wastewater treatment plants and to recover minerals in mining operations, and in watermills.
What is sluice gate valve?
Sluice gates are true end of line valves, designed to hold back water with minimal leakage in applications ranging from drainage pipes to effluent ponds to distributor boxes.
Can the coefficient of contraction be greater than 1?
Hello . In practice, the discharge coefficient cannot be greater than one. This is a fact. The error may be in compensating the values of the variables in the equation.
What is a coefficient of contraction?
physics. : the ratio of the cross-sectional area of the first vena contracta to the area of the discharge aperture.
How do you calculate the coefficient of discharge?
The discharge coefficient of an orifice or nozzle is defined as the ratio of the actual to theoretical flow rate:
- Cd=Measured Flow RateTheoretical Flow Rate (1)
- η=σΔp12ρ¯V2 (6)
- ξ=σΔp¯Δp (7)
What is the function of sluice gate?
The gate that controls a sluice is a valve known as a “sluice gate.” These valves are designed to seal in one direction and commonly are used to control water levels and flow rates in rivers and canals. They also are used in wastewater treatment plants.
Why is sluice gate important?
What is the function of sluice valve?
A large valve in which a rectangular or circular gate slides across the opening. It has been used in oil tankers to permit gravity flow from tank to tank, with the valve being operated from the weather deck.
What is the coefficient of discharge of a sluice gate?
This paper aims to investigate the effect of sill shape located under the sluice gate on the coefficient of discharge for free gate flow conditions. Both sill shape and sill height are studied.
How does sill affect the coefficient of discharge?
The presence of sill under sluice gate has a positive effect on the flow characteristics as it increases the coefficient of discharge no matter what shape is used. Both shape and height plays an important role in the enhancement of the discharge coefficient.
How are sluicegate discharge equations related to submerged flow?
SluiceGate Discharge Equations. Sluice-gate discharge coefficient is an involved function of geometric and hydraulic parameters. For free flow, it is related to upstream depth and gate opening, whereas for submerged flow, in addition to these parameters, it depends on tail-water depth.
How are free flow sluice gates affect the flow?
The existence of gates disturbs the flow and creates nonuniform flow conditions upstream and downstream of the gate. The outflow from these gates is classified as free or submerged depending on the tailwater depth.