What happens if you install a venturi backwards?

This may seem obvious, but we have seen several cases where a venturi was performing poorly because it was installed backwards. All differential producing flow meters will create a differential pressure with reverse flow, but the value of the pressure difference will not be the same as in normal flow condition.

What is the opposite of a venturi?

Why must it increase? Let’s look at the opposite of the venturi, a pipe who’s diameter increases, I think it’s pretty clear that the velocity will decrease since we have a larger pipe diameter, in other words there is no reason for the flow rate to change but something has to give and that’s the velocity.

Can venturi meter be used vertically?

In principle, the homogeneous model can be used with horizontally and vertically oriented Venturis.

Why do we not connect a manometer between the throat and the diverging section of a venturimeter?

The pressure gauges are mounted at inlet and throat of the venturimeter. The diverging section is not used for measuring the discharge because at this section flow separation may occur. When fluid flow through the venture meter then pressure difference is created which measured by the differential manometer.

What happens in Venturi meter?

A venturi creates a constriction within a pipe (classically an hourglass shape) that varies the flow characteristics of a fluid (either liquid or gas) travelling through the tube. As the fluid velocity in the throat is increased there is a consequential drop in pressure. This is termed a Venturi Meter.

How the Venturimeter should be installed for measuring the flow of fluid?

Detailed Solution. Venturimeter is a device that measures the flow rate of fluid through the pipe. It can be used in any position. When a venturimeter is placed in a pipe carrying the fluid whose flow rate is to be measured, a pressure drop occurs between the entrance and throat of the venturimeter.

What happens in a Venturi?

The Venturi effect states that in a situation with constant mechanical energy, the velocity of a fluid passing through a constricted area will increase and its static pressure will decrease. Therefore, the velocity of the fluid is increased, as the fluid needs to flow faster in the constricted area.

What is pressure recovery coefficient?

The performance of a diffuser is determined by a pressure recovery coefficient CPR. This is given as the increase in pressure across the diffuser divided by the dynamic pressure at the inlet.

When a Venturimeter is used in an inclined position?

kalyan said: Eventhough venturimeter is used in inclined position, it will show the same reading.

How venturi meters are used for flow measuring?

Venturi meters are flow measurement instruments which use 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. They have been in common use for many years, especially in the water supply industry.

Why divergent section of the venturimeter is longer than the convergent section?

Originally Answered: why the length of the diverging section in the venturimeter is longer than the converging? Because it reduce the backward motion of flow. It is not related to length. It is related with the angle.

What is venturimeter throat?

Construction: A venturimeter is essentially a short pipe (Fig. 15.1) consisting of two conical parts with a short portion of uniform cross-section in between. This short portion has the minimum area and is known as the throat.

What are the disadvantages of a venturi meter?

The coefficient of discharge (Cd) for the venturi meter is high. This is widely used for a high flow rate (Discharge). The installation cost of a venturi meter is high. There are little difficulties while maintenance. This device can not be used where the pipe has a small diameter of 76.2 mm.

What is the difference between an orifice meter and a venturi meter?

Venturi meter has a high coefficient of discharge as compared to an orificemeter. Venturi meter is more complex to fabricate than an orifice meter. Venturi meter requires large space whereas orifice meter requires relatively smaller space. , Has PhD in fluid dynamics from Caltech.

Where does the high pressure come from on a venturi meter?

Unlike a “true” Venturi meter, its high-pressure sensation comes from a corner location on the inlet side of the center flange. As previously explained, the Classical Venturi senses true static pressure at both the high- and the low-pressure tap cross sections, as does the short-form Venturi design.

When installing a Venturi in a pipeline care should be taken?

When installing a venturi in a pipeline care should be taken to center the meter. If the meter is installed off center a flow disruption could be created at the joint between the pipe and venturi causing a loss in accuracy.