[Free] Venturi flow meter 1" internal diameter

[richardphat]

Oh you measure basically the differential pressure. Anything can be improvised to measure the differential pressure,it just depends on how accurate you want your results to be. I tend to use water column as reference, then convert into Pascal.
Then you input those value into the following equation based on the following scheme.
The figure underneath, is basically the cross section of the venturi.



Based on Bernouilli's equation and with some tweak, the result is as follow.

Where A is the surface area, rho the density of the fluid and C is a flow correction. Typical venturi has a has a C value of 0.95(well .90 to )


There are many ways to measure flow, from simpliest device to complexe device. The venturi is a simple device but cost just too much, somewhat due to complexe geometry shape for machining.


In the industry and research, more people will tend to adopt the orrifice plate, since they care about cash and don't care about sacrificing pressure lost due to brutal geometry change that leads to formation of vorticities.
Basically, it's a disk with a hole in it.



The equation becomes more complicated, since you must add more correction factor , but again, you basically measure the differential pressure and input the value into the equation.