Calculate Flow through Venturi (Spirometry)

Other Hardware Science and Measurement
1

Hello everyone,

I am going to use a the pressure differential to calculate flow. I am having a hard time understanding how exactly to execute Bernoulli's equation. I assume the raw sensor data should be converted into inAq or inHg. Then Subtract the two to get the pressure Delta. This is where I get confused. How do I account for density of whatever I'm using to measure (water/mercury)?
I see in the equation where density of air is taken into consideration, but just cant fully wrap my mind around it. I have searched all over the web, but still don't quite get it. If someone could give me an example I would greatly appreciate it. Thanks!

2

You do not need to know density of Hg or Aq. The only density used is density of the flowing fluid you measure - of the air, for example.

3

Use SI units, not inches of anything!!!

4

Wow that was easy. It has taken me a while to grasp this equation, but I finally get it. That's all it was, should have been using SI units. Thanks!

5

It's been awhile, any chance you have the code that you used?