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Venturi meter
Venturi Meter: Measuring Flow Velocity A Venturi meter , also known as a Venturi tube , is a device used to measure the flow velocity of a fluid. It is...
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Venturi Meter: Measuring Flow Velocity A Venturi meter , also known as a Venturi tube , is a device used to measure the flow velocity of a fluid. It is...
A Venturi meter, also known as a Venturi tube, is a device used to measure the flow velocity of a fluid. It is essentially a ** constriction** or expansion device, featuring two different diameters connected by a constant diameter section.
The Venturi meter works by applying ** Bernoulli's principle**, which states that the velocity of a fluid decreases as it transitions from a region of higher pressure to a region of lower pressure. This principle applies because the constriction or expansion of the pipe causes the fluid's velocity to increase and decrease, respectively.
The difference in pressure between the two sections of the Venturi meter is directly proportional to the flow velocity. This relationship is expressed by the Venturi equation:
ΔP = ΔP_0 / (ρ * V^2)
where:
ΔP is the pressure difference between the two sections
ΔP_0 is the pressure difference at a reference point
ρ is the density of the fluid
V is the velocity of the fluid
Using the Venturi equation, we can calculate the flow velocity of the fluid by solving for V.
Example:
Suppose you have a Venturi meter with two sections with diameters of 10 mm and 20 mm. If the pressure difference between the sections is 0.1 atm and the density of water is 1000 kg/m^3, then the flow velocity of water would be:
V = (0.1 atm)/(1000 kg/m^3 * (π/4 (0.01 m)^2)^2} = 10 m/s
Therefore, the flow velocity of the water would be 10 m/s