Quote:
Originally Posted by Doyal_Mcneff
The flow is the same. Sorry. When you crush a 2.75 pipe it still has the same flow. You're just making one side wider and one side shorter. It equals out to be the exact same. The only thing prohibiting flow are both sets of cats.
|
An oval and a circle with the same perimeter length do not have the same area. Therefore when a circular pipe is reshaped to an asymmetric form, it is no longer at its' optimum flow rate.
For visual reference, let's look at the perimeter of 12 feet using 1x1 blocks.
Notice that changing from 3x3 (pseudo circle) to 4x2 (pseudo oval) drops area from 9 sqft to 8 sqft. The area is the opening of the pipe. We haven't changed the outside circumference. In this example, you can imagine this was 3" diameter pipe. By flattening it you have dropped the flow rate by 11.2% (8/9 = 0.8888r).