basic fluid dynamics

bootsnbraces

Hi guys and girls,

I hope you can help an electronics engineer out of his place in the mechanical world

My very basic question is for a vessel holding a liquid at a given pressure and a given opening in the vessel how can i calculate exit velocity and mass flow rate? Like if i blow a balloon up to say 1 bar (good balloon huh:)) and then put a 1mm hole inside it how fast will the air be travelling as it leaves the balloon?

I dont need anything to detailed ( not worried about internal friction losses etc) and for now i can assume the vessel is fed by constant pressure mechanism i.e it wont drop pressure as it empties!

Any help gratefully recieved

jbriggs444

Ignoring friction, the exit velocity should be just enough to squirt a stream back up to the height of the surface of the fluid.

That's about 30 feet for water at one atmosphere. 30 feet at one g is about 45 feet per second. Double the pressure and you multiply the stream velocity by sqrt(2).

Similar Threads for: basic fluid dynamics
Thread	Forum	Replies
[fluid dynamics] why are there no shear forces in a fluid at rest?	General Physics	15
Help understanding BASIC fluid dynamics behind faraday waves	Mechanical Engineering	2
Fluid dynamics - finding pressure for a rotating fluid	Calculus & Beyond Homework	2
FLUID DYNAMICS AND BEHAVIOUR OF REAL FLUID help!!!	Engineering, Comp Sci, & Technology Homework	0
Fluid dynamics	Aerospace Engineering	1

jbriggs444	Ignoring friction, the exit velocity should be just enough to squirt a stream back up to the height of the surface of the fluid. That's about 30 feet for water at one atmosphere. 30 feet at one g is about 45 feet per second. Double the pressure and you multiply the stream velocity by sqrt(2).