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The wetted perimeter of a circular open channel is defined as the surface of the channel's bottom and sides in direct contact with the liquid. It is an important parameter in hydraulic engineering for calculating flow characteristics in open channels.
The calculator uses the formula:
Where:
Explanation: The formula calculates the wetted perimeter by multiplying twice the radius with the half angle subtended by the water surface at the center of the circular channel.
Details: Accurate calculation of wetted perimeter is crucial for determining hydraulic radius, flow resistance, and discharge capacity in open channel flow calculations. It helps in designing efficient drainage systems and irrigation channels.
Tips: Enter the radius of the circular channel in meters and the half angle in radians. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the significance of wetted perimeter in open channel flow?
A: Wetted perimeter is used to calculate hydraulic radius, which is essential for determining flow resistance, velocity, and discharge capacity in open channels.
Q2: How is half angle by water surface measured?
A: Half angle is the angle subtended at the center of the circular channel by the water surface. It is typically measured in radians and depends on the depth of flow in the channel.
Q3: What are typical values for circular channel radius?
A: Radius values vary depending on the application, but typically range from 0.1m for small drainage pipes to several meters for large irrigation channels.
Q4: Can this formula be used for partially filled circular pipes?
A: Yes, this formula is specifically designed for calculating wetted perimeter in circular channels with partial flow conditions.
Q5: How does wetted perimeter affect flow efficiency?
A: A smaller wetted perimeter relative to cross-sectional area (larger hydraulic radius) generally indicates more efficient flow with less resistance.