Measure flow rate with a manometer (pressure gauge)

In summary, the conversation discusses a volume of 50 liters being pressurized with air to 1 bar on the manometer. However, there is a leakage in the volume causing the pressure to drop to 0.5 bar after 30 seconds. The question is asked about calculating the air flow (liters/minute) of the leakage and the speaker provides an example of filling the volume with 10 liters for 1 bar and 5 liters for 0.5 bar, leaving 5 liters over 30 seconds.
  • #1
Xefyros
3
0
Hello!

I have a volume of 50 liters which I pressurize with air so that I read 1 bar on the manometer.
But there is a leakage in the volume so after 30 sec the manometer shows 0,5 bar.

What is then the air flow ( liter / min) of the leakage?
 
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  • #2
The flow rate will change as the pressure difference changes.
 
  • #3
scottdave said:
The flow rate will change as the pressure difference changes.

Hello, maybe bad explained but I would want to know if you can count how much air you have to fill up the 50 liter volume with to get 1 bar (over) pressure and then how much air that has left when the manometer reaches 0,5 bar.
So let's say that you need to fill up the volume with 10 liter for 1 bar and 5 liter for 0,5 bar pressure -> then over 30 seconds it has left 5 liter ( from 1 bar to 0,5 bar) and we would then have ~~10 liter / min
(just example numbers)
 

1. How does a manometer measure flow rate?

A manometer measures flow rate by comparing the pressure difference between two points in a fluid system. It uses a U-shaped tube filled with a liquid, typically water or mercury, and the difference in height of the liquid on each side of the tube indicates the pressure difference.

2. What is the accuracy of a manometer in measuring flow rate?

The accuracy of a manometer in measuring flow rate depends on the type of manometer used and the skill of the operator. Generally, a well-calibrated manometer can have an accuracy of +/- 0.5% of the full-scale reading.

3. Can a manometer be used to measure flow rate in all types of fluids?

Yes, a manometer can be used to measure flow rate in all types of fluids, including liquids and gases. However, the type of manometer used may vary depending on the properties of the fluid being measured.

4. How do I calculate flow rate using a manometer?

To calculate flow rate using a manometer, you will need to measure the pressure difference between two points in the fluid system using the manometer. Then, you can use the Bernoulli's equation or other flow rate equations to calculate the flow rate.

5. Can a manometer be used for both high and low flow rates?

Yes, a manometer can be used for both high and low flow rates. However, for very low flow rates, a more sensitive manometer may be needed to accurately measure the pressure difference. For high flow rates, a manometer with a larger scale and range may be required.

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