Froude Number Calculator
Froude Number Calculator
The Froude Number Calculator helps determine the flow regime in open channel hydraulics using the Froude number formula:
Fr = V / √(g × L), where:
- Fr = Froude number
- V = flow velocity (m/s)
- g = gravity (9.81 m/s²)
- L = hydraulic depth (m)
🌊 What is the Froude Number Used For?
The Froude Number (Fr) is crucial in fluid dynamics to determine whether open channel flow is tranquil, critical, or rapid. Engineers and hydrologists use it to:
- Classify river and canal flows
- Design spillways and culverts
- Analyze sediment transport
- Evaluate hydraulic jumps and energy dissipation
📌 Importance of the Froude Number in Engineering
In hydraulic engineering, the Froude number tells you if the flow can adjust to changes downstream. It’s especially important in dam design, irrigation canals, flood modeling, and wastewater treatment.
❓ Frequently Asked Questions (FAQs)
Q1. What is a typical Froude number in natural rivers?A: Usually less than 1 (subcritical), unless during floods or steep slopes.
Q2. Can this calculator be used for pipe flow?
A: No. The Froude number applies only to open channel flows, not closed conduits.
Q3. What happens when Fr = 1?
A: It’s a critical flow – an important transition point in hydraulic behavior.