Tubo Venturi - FLC-VT-BAR, FLC-VT-WS (2024)

FAQs

What is the equation for the Venturi tube? ›

The Venturi effect equation is p 1 − p 2 = d / 2 ( v 2 2 − v 1 2 ) where p is pressure, d is the density of the fluid, and v is velocity. The two terms for pressure and velocity are divided into those present in a larger container (v1 and p1) and those in the constrained opening (v2 and p2).

The Venturi tube or venturimeter is an instrument for measuring with accuracy the flow rate of fluids in pipes.

Venturi flow meters offer high accuracy and reliability for flow measurement of pressurized line fluids, including liquids, gases, and steam, as well as high-viscosity line fluids, solids-bearing line fluids, and harsh or contaminated line fluids.

Horizontal Venturimeter: This type of venturimeter has the highest kinetic energy and the lowest potential energy. Vertical Venturimeter: This type has the maximum potential energy and the minimum kinetic energy. Inclined Venturimeter: Both potential and kinetic energy are in between the above two types mentioned.

The volumetric flow rate, Q (unit volume per unit time, in SI units m³/s), of a fluid flowing through the venturi at any given point is the product of the cross-sectional area, A (SI unit: m²) at that point multiplied by the fluid's linear velocity, v (m/s), at that point.

The Venturi Effect is used daily in a multitude of applications; from spray cans, car carburetors, space rockets and even measuring instruments. It is in fact in the Venturi tube, used for the measurement of speed, that the phenomenon discovered in the 19th century finds its maximum expression.

When a venturi system is activated, water flows through the flow-restricting body and speeds up due to the decreased volume. This creates a vacuum in the body that is used to draw chemical concentrate into the water stream.

The Venturi effect and Bernoulli's principle are related to each other through conservation laws. Specifically, we have the Venturi effect arising from conservation of momentum and conservation of mass. Bernoulli's principle is a general statement about conservation of energy in laminar flow.

Disadvantages: Complex Design: The design of a venturi tube is more complex than other types of flow meters, which may result in higher manufacturing costs. Installation: The installation of a venturi tube can be more complicated compared to other types of flow meters.

Orifice meters introduce higher pressure drops but are simpler in design and widely used. Venturimeters, on the other hand, have lower pressure drops, higher energy efficiency, and improved accuracy, making them suitable for applications where minimal pressure loss and accurate flow measurement are required.

How accurate is a Venturi flow meter? ›

Note that by default, Venturi flow meters offer an accuracy of around ±1% of the discharge coefficient.

The venturi meter consists of a main piece of pipe that decreases in size to a section called the throat, followed by a gradually increasing size back to the original pipe size. The liquid pressure at the main pipe section 1 is denoted by P₁ and that at the throat section 2 is represented by P₂.

In a venturimeter, the losses are highly less, therefore, the coefficient of discharge is more whereas in an orifice meter the losses are a lot and therefore the coefficient of discharge cannot be much. The venturimeter can have more price of installation and replacement as compared to an orifice meter.

The Venturi meter demonstrator shows how fluid pressure is reduced when it flows through a constricted section of tubing. It uses Bernoullii's Principle, which states that air/fluid flows faster in the constricted section. The meter itself used water (dyed in this case to show better).

Venturimeter: Venturimeter is a discharge measurement instrument that uses a converging section of pipe to give an increase in the flow velocity and a corresponding pressure drop from which the flowrate can be deduced. Current meter: It is a device used for measuring the speed of flow in a watercourse.

The volume flow rate is Q=dVdt=Av, Q = d V d t = A v , where A is the cross-sectional area of the pipe and v is the magnitude of the velocity. Vt=Adt. V t = A d t . We note that Q=V/t Q = V / t and the average speed is v =d/t v = d / t .

You can also calculate the air flow rate if you already know what the air velocity and pipe diameter are. With this information, you can use the following formula to determine the air flow rate: Q_air = u_air * π. D²/4.

The equation is F = ρ * A * (V2 - V1), where ρ is the density of the fluid, A is the cross-sectional area of the Venturi, and V2 and V1 are the velocities at the throat and inlet of the Venturi, respectively.

The flow coefficient for classic venturi is 0.984, with an uncertainty tolerance of ± 0.75%. While the short Venturi form can be made of cast iron or welded from various materials according to the application given. The short flow coefficient for Venturi is 0.985 with a tolerance of uncertainty of ± 1.5%.