You are Here: Home >< Physics

# Volumetric Flow Rate Watch

1. I have a set of pressure measurements at various points along a horizontal free-flowing air jet. The jet exits through a nozzle, then the pressure at the nozzle is measured. At 60, 180 and 300mm away from the nozzle, pressure measurements are made at 5mm vertical intervals out to 60mm each side. This means I have graphs showing velocity across the whole flow at each point.

How do I calculate the volumetric flow rate at each point? The flow isn't uniform, so I should integrate across the whole flow - but I don't have an equation, I have a set of discrete data. What numerical method could I use?

I've tried using a form of the trapezium rule (connecting each data point with a straight line) combined with a volume of revolution, but I don't know if that's right.

I think that might be wrong, because at the nozzle I get a flow rate of about 12Litres/sec, but at 60mm it's 33mL/sec, when it should be roughly the same due to conservation of energy.

Anyone have any ideas? Sorry for the long post!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 28, 2013
Today on TSR

### Is this person a genius?

...with these A Level results?

### I think I'm transgender AMA

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.