What is Venturimeter. How Venturimeter works. Working Principle of Venturimeter.Animation Video.

Summary

In this video, the concept and functioning of a Venturimeter are explained in detail. A Venturimeter is a device installed in pipelines to measure the flow rate of gas or liquid. It operates based on the principles of the Continuity Equation and Bernoulli's Theorem, where a constriction in the pipe causes the fluid's velocity to increase, resulting in a pressure drop. The device consists of three main parts: the converging part, throat, and diverging part. The pressure difference between two points is measured and used to calculate the fluid flow rate. The video offers a clear understanding of how Venturimeters are used for precise fluid measurement.

Takeaways

• 😀 Venturimeter is a device used to measure the flow rate of liquids or gases in a pipeline.
• 😀 It works by creating a pressure difference at two locations within the device.
• 😀 A venturimeter has no moving parts, consisting of three main sections: converging part, throat, and diverging part.
• 😀 The converging part of the venturimeter narrows in shape, causing the fluid's velocity to increase and pressure to decrease.
• 😀 The throat, which has a constant diameter, ensures the velocity and pressure of the fluid remain stable.
• 😀 The diverging part of the venturimeter increases the pressure as the fluid's velocity decreases.
• 😀 The venturimeter operates based on the continuity equation and Bernoulli’s theorem.
• 😀 According to the continuity equation, a decrease in cross-sectional area increases fluid velocity.
• 😀 Bernoulli's theorem explains that as the velocity of the fluid increases, its pressure decreases.
• 😀 Pressure taps are placed at the inlet (high pressure) and the throat (low pressure) to measure the pressure difference, which is used to calculate the flow rate.
• 😀 The venturimeter helps engineers accurately measure the flow rate of fluids in pipes by leveraging pressure differences.

Q & A

What is a Venturi meter?

A Venturi meter is a device installed in a pipeline to measure the flow rate of gas or liquid flowing through the pipe. It works by measuring the pressure difference at two locations in the pipe.

How is a Venturi meter connected to a pipeline?

A Venturi meter is attached to the pipeline using flanges, ensuring that the fluid flowing through the pipe also flows through the meter.

What are the main components of a Venturi meter?

A Venturi meter consists of three main parts: the converging part, the cylindrical throat, and the diverging part.

What happens in the converging part of the Venturi meter?

In the converging part, the cross-sectional area of the pipe decreases, causing the fluid to flow faster. This increased velocity leads to a decrease in pressure.

What is the role of the cylindrical throat in a Venturi meter?

The cylindrical throat is the middle part of the Venturi meter. It has a constant diameter, allowing the fluid to pass through without changing its velocity or pressure.

How does the diverging part of the Venturi meter affect the fluid?

In the diverging part, the cross-sectional area gradually increases, causing the velocity of the fluid to decrease and the pressure to increase.

What is the principle behind the operation of a Venturi meter?

The operation of a Venturi meter is based on the continuity equation and Bernoulli's theorem. According to the continuity equation, as the cross-sectional area decreases, the velocity of the fluid increases. Bernoulli's theorem states that an increase in fluid velocity results in a decrease in pressure.

How is the pressure difference used to calculate the flow rate?

The pressure difference between two tapping points, one near the inlet and the other at the throat, is measured. This difference is used to calculate the flow rate of the fluid using a manometer or a differential pressure gauge.

Why are pressure tappings important in a Venturi meter?

Pressure tappings are holes in the walls of the Venturi meter that measure the fluid pressure at two key points: the high-pressure tapping is at the inlet, and the low-pressure tapping is at the throat. The pressure difference is used to calculate the flow rate.

How does the Venturi meter recover pressure after the throat?

The diverging part of the Venturi meter helps recover the pressure lost in the converging part. As the cross-sectional area increases, the velocity decreases and the pressure increases, restoring the fluid’s pressure.