Total Hydrostatic Force on Surfaces

Total Hydrostatic Force on Plane Surfaces
For horizontal plane surface submerged in liquid, or plane surface inside a gas chamber, or any plane surface under the action of uniform hydrostatic pressure, the total hydrostatic force is given by
 

$F = pA$

 

where p is the uniform pressure and A is the area.
 

002-total-hydroforce-plane-surface.gif

 

In general, the total hydrostatic pressure on any plane surface is equal to the product of the area of the surface and the unit pressure at its center of gravity.
 

$F = p_{cg}A$

 

where pcg is the pressure at the center of gravity. For homogeneous free liquid at rest, the equation can be expressed in terms of unit weight γ of the liquid.
 

$F = \gamma \bar{h} A$

 

where   $\bar{h}$   is the depth of liquid above the centroid of the submerged area.
 

Hydrostatic Pressure on Surfaces

  1. Total Hydrostatic Force on Plane Surfaces
    • Plane surface inside a gas chamber
    • Horizontal plane surface
    • Vertical plane surface
    • Inclined plane surface
  2. Total Hydrostatic Force on Curve Surfaces
    • Fluid is above the curve surface
    • Fluid is below the curve surface
    • Fluid is below and above the curve surface
  3. Analysis of Gravity Dam
  4. Buoyancy
  5. Statical Stability of Floating Bodies
  6. Stresses on Thin-walled Pressure Vessels

Manometers

Manometer is a simple and inexpensive device of measuring pressure and pressure difference. It is usually bent to form a U-tube and filled with liquid of known specific gravity. The surface of the liquid will move in proportion to changes of pressure.
 

001-piezometers.gif