EGN 3353C Fluid Mechanics
Lou Cattafesta
MAE Dept.
University of Florida
Lecture 6
Pressure Forces on Plane Surfaces
Applications:
forces on dams, pools walls, ship hulls, etc.
Need to know
o
magnitude of the force
o
point of application (also called center of pressure)
Common simplification
Æ
P
atm
acts on both sides of surface so its effect cancels.
We can subtract P
atm
and just use the gage pressure.
Let’s look at the hydrostatic force on ONE
side of a submerged surface
Key points:
Origin “O” at free surface
Cartesian coordinate system with y
along plate at angle
θ
w.r.t. free
surface
Pressure force acts in – surface
normal direction
Two solution methods:
1.
using algebraic formulas
derived below, valid for special cases
2.
using direct integration
(
recommended
)

This
** preview**
has intentionally

**sections.**

*blurred***to view the full version.**

*Sign up*