LiamG6 wrote:
Quick question, when you do flow sims, do you use volumetric flow rate on inlet and pressure on outlet?
Just want to know so I can run some proper sims. I used volumetric flow rate for inlet of 0.11m3/s, I wanted to use 0.094m3/s which is 5.67l/m or 1.5gpm. 0.11m3/s translates to ~1.7gpm, so still achievable with our pumps, where I'm lost is the pressure side, it asks for an outlet pressure, I used 31026pascals, which is like 4.5psi, which is approximately what a laing D5 at setting 5 would do. Now is that correct or totally wrong? I'm a bit confused about the PSI, because I got that 4.5psi off a P/Q chart for a D5 at 1.75gpm. Is that PSI on the P/Q chart the actual output pressure of the pump? And would this figure in turn have to be lowered to account for the pressure drop of the block being tested?
EDIT: this is wrong. 1.5gpm is 0.000094635m3/s. I'll try that as inlet volume flow rate with 20684pa outlet pressure (3psi) sound better?
The thing that 99% of people gets wrong when using a program for thermal testing. Is they apply a static pressure or flow to the inlet and call that the pump. This widely wrong and results on most of the crazy designs out there that people clam as awesome.
If you apply a static pressure then you have unlimited flow this favors a un restrictive block.
If you apply a static flow this favors a restrictive block.
When testing on the computer it's incredibly important that you apply a proper pump curve, where as the flow increases pressure decrease and via versa