Register to reply

What's the pressure acting on this fluid?

Share this thread:
Marmoteer
#1
Nov2-13, 10:32 PM
P: 8
I understand that as an incompressible fluid flows through a pipe with decreasing cross sectional area the velocity increases. This must happen for the mass/volume continuity equations to be true. Since the velocity is increasing though there has to be a net pressure on the fluid right? My question is - what's the best way to think about this pressure? Is it like pressure "buildup" because the flow is restricted? Or is there a better way to interpret it?
Phys.Org News Partner Physics news on Phys.org
Mapping the optimal route between two quantum states
Spin-based electronics: New material successfully tested
Verifying the future of quantum computing
boneh3ad
#2
Nov3-13, 01:29 AM
PF Gold
boneh3ad's Avatar
P: 1,491
Think of it more like potential energy, and as the velocity increases, more is converted to kinetic energy (dynamic pressure) so the static pressure falls. Indeed, the units of pressure can be rewritten as energy per volume.


Register to reply

Related Discussions
Adding stirring force acting on the fluid Classical Physics 6
Fluid Mechanics HW How pressure in a tank affects exit velocity of a fluid Engineering, Comp Sci, & Technology Homework 3
Force acting on a flat plate that is moving trough fluid Classical Physics 1
Fluid dynamics - finding pressure for a rotating fluid Calculus & Beyond Homework 2
Fluid Pressure and Fluid Force in Calculus II Introductory Physics Homework 12