- #1
TheMak
- 2
- 0
Hey Everybody! It's my first time posting here, so please forgive any
errors that might creep into this post.
I'm a guy who loves physics. In fact, it has been my favorite subject ever
since I can remember, and in physics, the field that attracts me the most
is kinematics. Well, the question I have is about fluid flow, specifically,
the pressure of a fluid. I've never been good at fluid dynamics and
kinematics so if this sounds like an idiotic question, I'm sorry in
advance.
Everywhere I read, it is said that fluid pressure is inversely related to
the speed of the flow. Meaning that if a fluid is flowing through a pipe at
a flow rate of say, 10Kg/second, it will be exerting more pressure than it
would if it were flowing at a rate of 5Kg/second. Basically, it means that
in order to increase the pressure of a fluid, you have to slow it down and
expand its volume. This seems so counter-intuitive! By extension, if a
fluid is at rest, mass flow rate is 0Kg/sec and it's volume is made
infinite, it must have infinite pressure?! This means that the air in the
room I'm sitting should be at an infinite pressure and crush me
immediately! But that is not the case.
Basically, what I'm saying is that if I can increase the pressure by
decreasing the speed of fluid flow, then is not a fluid at rest also at
infinite pressure?
So what is pressure? I always thought that pressure was generated by
confining a large amount of fluid in a small volume. The more the fluid and
the smaller the volume, the higher the pressure. Am I right or wrong? And
what's with the fluid pressure while it's flowing?
I look forward to your answers as I have registered with physics forums
specifically for asking this question.
Thanks,
Mak.
errors that might creep into this post.
I'm a guy who loves physics. In fact, it has been my favorite subject ever
since I can remember, and in physics, the field that attracts me the most
is kinematics. Well, the question I have is about fluid flow, specifically,
the pressure of a fluid. I've never been good at fluid dynamics and
kinematics so if this sounds like an idiotic question, I'm sorry in
advance.
Everywhere I read, it is said that fluid pressure is inversely related to
the speed of the flow. Meaning that if a fluid is flowing through a pipe at
a flow rate of say, 10Kg/second, it will be exerting more pressure than it
would if it were flowing at a rate of 5Kg/second. Basically, it means that
in order to increase the pressure of a fluid, you have to slow it down and
expand its volume. This seems so counter-intuitive! By extension, if a
fluid is at rest, mass flow rate is 0Kg/sec and it's volume is made
infinite, it must have infinite pressure?! This means that the air in the
room I'm sitting should be at an infinite pressure and crush me
immediately! But that is not the case.
Basically, what I'm saying is that if I can increase the pressure by
decreasing the speed of fluid flow, then is not a fluid at rest also at
infinite pressure?
So what is pressure? I always thought that pressure was generated by
confining a large amount of fluid in a small volume. The more the fluid and
the smaller the volume, the higher the pressure. Am I right or wrong? And
what's with the fluid pressure while it's flowing?
I look forward to your answers as I have registered with physics forums
specifically for asking this question.
Thanks,
Mak.