文档介绍：Chapter 3 Fluid Statics
Direction of Pressure
Along the inward normal direction of fluid surface
Magnitude of Pressure
py
pz
px
x
y
z
pn
Pressure Properties of Static Fluid
The pressure values at any point in a static fluid are the same in all directions.
Balance Equation of Static Fluid
Similarly,
fx
Differential Pressure Formula (Euler balance differential Equation)
rectangular coordinate system
cylindrical coordinate system
The equal pressure surface
Conclusion: The mass force is perpendicular to the equal pressure plane.
Pressure of Static Fluid in Gravity Field
pressible Fluid
The equal pressure plane
g
Conclusion: The equal pressure plane is horizontal
pressible fluid
Expression methods of pressure
1) Relative pressure (Gauge Pressure )
2) Absolute pressure
h
0
3) Pressure height
water column height
Mercury column height
Remember: An engineering atmosphere pressure