Search found 3 matches

by mavpro
Tue May 12, 2015 4:07 am
Forum: Flow calculators and fluid flow problems
Topic: passive pressure compensation: time to equalise
Replies: 4
Views: 11713

Re: passive pressure compensation: time to equalise

I realise after I posted there was an error in my logic; it did not take into account the volume of the vessel, in this case 10L. I need to delve a little deeper into your 'gas discharge flow calculator', if I may. I can see how you derive the mass flow rate (w) using the modified Darcy formula, if ...
by mavpro
Mon May 11, 2015 4:33 am
Forum: Flow calculators and fluid flow problems
Topic: passive pressure compensation: time to equalise
Replies: 4
Views: 11713

Re: passive pressure compensation: time to equalise

Thank you for your reply, its been very helpful. To answer your first question, the bladder is attached all the time (part of the same equipment). I think I've got the answer, working back from your earlier post. I used the equation Dt = sqrt [(f*L/2.D.g)*(Dh^2/H-Dh)]. Where Dt = time step Dh = chan...
by mavpro
Thu May 07, 2015 2:53 am
Forum: Flow calculators and fluid flow problems
Topic: passive pressure compensation: time to equalise
Replies: 4
Views: 11713

passive pressure compensation: time to equalise

Bit of a tricky one..... I have a pressure sensitive underwater vessel (+/- 50kPa operating pressure), say 10L fixed air volume, connected to a pressure compensating bladder via a 2m long, 8mm dia hose (same depth as vessel). The bladder balances the internal pressure of the vessel to avoid it being...