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Wetted Perimeter for Partial Flow refers to the length of the pipe or channel's inner surface that is in contact with the flowing fluid when it is not running full. It is a crucial parameter in hydraulic calculations for partially filled conduits.
The calculator uses the formula:
Where:
Explanation: The formula calculates the actual wetted perimeter when a conduit is partially filled by multiplying the proportionate perimeter (ratio of partial to full perimeter) by the full wetted perimeter.
Details: Accurate wetted perimeter calculation is essential for determining hydraulic radius, flow resistance, and discharge capacity in partially filled pipes and channels. It helps in designing efficient drainage and sewer systems.
Tips: Enter the proportionate perimeter (dimensionless ratio) and the full wetted perimeter in meters. Both values must be positive numbers.
Q1: What is proportionate perimeter?
A: Proportionate perimeter is the ratio of wetted perimeter while running partially full to running full.
Q2: Why is wetted perimeter important in fluid mechanics?
A: Wetted perimeter directly affects the hydraulic radius, which influences flow resistance, velocity distribution, and discharge capacity in open channel flow.
Q3: How does wetted perimeter change with flow depth?
A: Wetted perimeter increases with flow depth in most channel shapes, though the relationship varies depending on the cross-sectional geometry.
Q4: Can this formula be used for all channel shapes?
A: The basic formula applies to all shapes, but the proportionate perimeter calculation depends on the specific cross-sectional geometry of the conduit.
Q5: What are typical units for wetted perimeter?
A: Wetted perimeter is typically measured in meters (m) in the SI system or feet (ft) in the imperial system.