Flow Rate Through Slot
- Flow Rate Through Tube
- Flow Rate Through Two Concentric Orifices
- Flow Rate Through Silt Fence
- Flow Rate Through Slot Machines
The width of the slot opening determines the flow rate. To calculate the flow rate of a Slot Drain, you can use these formulas: 1/2 inch slot opening = 11 gallons per minute per foot of slot 1 inch slot opening = 18 gallons per minute per foot of slot. To calculate the flowrate of a fluid passing through an orifice plate, enter the parameters below. (The default calculation involves air passing through a medium-sized orifice in a 4' pipe, with answers rounded to 3 significant figures.).
Orifice Discharge into Free Air
Flow Rate Through Tube
An orifice is an opening with a closed perimeter through which water flows. Orifices may have any shape, although they are usually round, square, or rectangular.
Discharge through a sharp-edged orifice may be calculated from:
Q = Ca?2gh
where
Q= discharge, ft3/s (m3/s)
C =coefficient of discharge
a =area of orifice, ft2 (m2)
Flow Rate Through Two Concentric Orifices
g =acceleration due to gravity, ft/s2 (m/s2)
h =head on horizontal center line of orifice, ft (m)
The coefficient of discharge C is the product of the coef- ficient of velocity Cv and the coefficient of contraction Cc. The coefficient of velocity is the ratio obtained by dividing the actual velocity at the vena contracta (contraction of the jet discharged) by the theoretical velocity. The theoretical velocity may be calculated by writing Bernoulli’s equation for points 1 and 2.Thus
V2= ?2gh
The coefficient of contraction Cc is the ratio of the smallest area of the jet, the vena contracta, to the area of the orifice.
Submerged Orifices
Flow through a submerged orifice may be computed by applying Bernoulli’s equation to points 1 and 2 in figure below
Values of C for submerged orifices do not differ greatly from those for nonsubmerged orifices.
Related Tools
Find another flow measurement calculator by clicking on the required answer which coincides with the input parameters you already know.
| vol flow | mass flow | flow speed | vol | mass | time |
|---|---|---|---|---|---|
| area | flow speed | vol flow | |||
| dia | flow speed | vol flow | |||
| w x h | flow speed | vol flow | |||
| time | vol | mass | vol flow | mass flow | |
| vol | time | density | vol flow | ||
| mass | time | density | mass flow | ||
| density | mass flow | vol flow | mass | vol | |
| flow speed | area, dia |
User Guide
This tool will calculate the volumetric flow rate in any units from the specified velocity of a substance flowing through a defined cross-sectional area. For each new calculation a unique conversion scale will be generated for the range of flow velocities and volumetric flow rates with the cross sectional area specified.
Formula
The volumetric flow rate formula used by this calculator is:
Q = v · A
Symbols
- Q = Volume flow rate
- v = Flow velocity
- A = Cross-sectional area
n.b. This formula assumes uniform flow conditions within the entire cross-sectional area, without any friction losses near to surfaces.
Flow Velocity Measured
Enter the speed at which the substance is moving.
Cross-Sectional Area
Enter the size of the area perpendicular to the direction of flow.
Flow Rate Through Silt Fence
Volumetric Flow Rate Calculation
Flow Rate Through Slot Machines
This is the amount of volume that will flow pass per unit of time.