Okay, here's the challenge: measure the flow rate of a stream.
What is the flow rate (liters/min) for a given height H? A derivation and formula, please!
Solved! Go to Solution.
This is an interesting illustration of engineering adapting physics.
Both Alan's solution (kudos, BTW) and the one attached below properly derive the physics of the problem from basic concepts: the gravity head creates a flow over the weir, and that times the area gives the flow rate. But when the actual flow rate was measured it fell significantly short of what was calculated.
The old engineers, well used to having theory only approximate reality (because of the assumptions made to achieve a solution) merely created a "coefficient," to adjust theory to reality. It would be interesting to see what ANSYS would do with this problem.
"The old engineers, well used to having theory only approximate reality (because of the assumptions made to achieve a solution) merely created a "coefficient," to adjust theory to reality. "
Engineers regularly do this, of course. They have discharge coefficients, friction factors, loss coefficients etc. The nuclear reactor physicists I knew would never stoop to such common or garden terms. When their theoretical rod positions didn’t quite match the measured ones, they modified their theory by an eigenvalue bias (a rose by any other name…!)
It's been my observation that there are two types of "coefficients":