Flow Rate Through Slot
- In the flow through a given slot, an increase in the flow rate builds up the water depth behind the slot plate so that the water depth just before the slot opening is greater than that at the edge of a weir. Therefore, the nappe through a slot is under the influence of the extra pressure of the water buildup behind the slot plate.
- The flow rate with respect with gap width in general follows a parabolic curve. However, these curves get distorted at lower values of gap opening when the flow starts getting affected due to the minimum gap width restriction. D.The effect of slope angle of the side walls of the hopper on flow rate is very distinct. The rate of flow varies linearly.
A slot is a weir regardless of whether it fits into any standard model of a weir. The important characteristic of a weir that it is free surface flow and at some point the flow is at minimum energy (at transition from sub critical to super critical critical depth if you like). You can calculate the flow through a weir/slot from this principle. The flow of solution through these narrow channels is determined by the Pouiselle Flow equation (given by Equation 1) where the drop in pressure within a slot-die head (delp) is determined by the flow rate of the solution (V), the viscosity of the solution (mu), the channel length (L), and the channel width (b).
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 ยท 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
Flow Rate Through Soil
Enter the size of the area perpendicular to the direction of flow.
Volumetric Flow Rate Calculation
Flow Rate Through Tubing
This is the amount of volume that will flow pass per unit of time.