Physics

Orifice Flow Calculator

Find flow through an orifice under a head of fluid.

Discharge coefficient

Orifice area

Head

Gravity (m/s²)

Calculated Output

Flow rate (m³/s) 0.0039

Formula: Q = Cd·A·√(2·g·h)

Step-by-Step Breakdown

1. Values used:

2. Discharge coefficient = 0.62

3. Orifice area = 0.001

4. Head = 2

5. Gravity = 9.81 m/s²

7. Flow rate = 0.0039m³/s

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The math behind it

Q = Cd·A·√(2gh) (Torricelli's law with a discharge coefficient ~0.62 for a sharp orifice).

Cd 0.62, A 0.001 m², head 2 m → about 0.00388 m³/s.

Why √h?

Exit velocity is √(2gh), so flow scales with the square root of head.