|Jul15-12, 12:57 AM||#1|
Pressure theory applied to a Venturi tube
I'm a little confused about the pressure in the inlet/outlet and the throat of a Venturi tube.
Why is the pressure in the inlet/outlet greater than in the throat? I thought that because air is needed to flow into a smaller space so the pressure has to be greater?
Pardon me. I've self-learning.
Thanks for your time.
|Jul15-12, 03:04 AM||#2|
hi extricate! welcome to pf!
it's conservation of energy (density) …
Bernoulli's equation is simply a conservation of energy (density) equation
(and pressure is energy density: pressure = work done per displaced volume = energy per displaced volume)
where the tube is narrower, the speed is faster, so the kinetic energy density is greater
so the pressure must be less
|Jul22-12, 11:40 AM||#3|
Thanks alot for the reply.
|energy density, venturi|
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