ENGR 210 lecture 15: Hydrostatic pressure

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ENGR 210 lecture 15 Hydrostatic pressure
Hydrostatic pressure the pressure developed due
to placement under the surface of a liquid
Absolute atmospheric gauge
This equation has three parts p Total pressure
felt by the submerged object po Pressure at
the surface of the liquid due to
atmosphere ?liqgh Pressure at some depth from
dense liquid subjected to gravity
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Fluid Force on flat surfaces due to fluid
pressure
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• Buoyant Force for submerged or partially
  submerged objects
• Direction upward
• Location centroid of submerged portion of
  object (center of
• buoyancy or c.o.b.)
• Magnitude Fbouy ?liqgV

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Example Problem8.3.1Sea wall is 20ft wide and
15ft deep. Find equivalent force and location
from hydrostatic pressure produced. Note that
seawater is 2.5 more dense than fresh water.
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Example Problem 8.3.13Triangular gate valve is
held at O by force P. Find P.
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Example Problem 8.3.23Pool wall has parabolic
curved surface as shown. Find equivalent force
and location due to hydrostatic pressure on wall.