The discussion revolves around a Venturi experiment applying Bernoulli's equation, where the original poster observes an increase in energy as the fluid travels through a contracting tube, which seems contradictory to the principle that energy should remain constant.
The discussion is ongoing, with participants providing guidance on checking calculations and clarifying the use of units. There is an exploration of the implications of back pressure on the results, but no consensus has been reached regarding the original poster's observations.
Participants note the need for clarity on the pressure measurements used in the calculations and the implications of the experiment's orientation on the results. There is also mention of the original poster's requirement to explain the observed energy increase.
jarednjames said:Can you show your calculations? It would make it a lot easier to see where the problem is.
jarednjames said:Can I ask where you pressure is on that spreadsheet?
Is the experiment horizontal or vertical?
You have "head" in metres, but nothing to give you a pressure in your calculations.
jarednjames said:Well your units are all to pot.
You have head in metres and velocity in m/s which, when added together give you another value in m/s which isn't energy.
lefteris28 said:The formula we use is that P/ρg + v²/2g +z=total energy
P/ρg= head of fluid v²/2g = head of velocity
jarednjames said:Yes, but your units on the spreadsheet don't match this so it's difficult to see what goes where and does what.