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Lecture%205_Fluid%20Statics

Lecture%205_Fluid%20Statics - ME309 Fall 2009 Lecture 5...

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ME309 Fall 2009 Lecture 5: Fluid Statics Andrew Lee Maurice J. Zucrow Laboratories Purdue University West Lafayette, Indiana
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9/2/2009 Andrew Lee 2/11 Fluid Statics Often called hydrostatics Study of fluid at rest No shear stress; only normal stress exists Basic principle: pressure increases with depth
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9/2/2009 Andrew Lee 3/11 Basic Equation of Fluid Statics x y z g Assumptions 1. Static fluid 2. Gravity is only body force 3. The z axis in vertical and upward (in the opposite direction of gravity)
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9/2/2009 Andrew Lee 4/11 Basic Equation of Fluid Statics dP g dz ρ = - “Rate of change in pressure in the z-direction is equal to minus one times density times gravitational acceleration” How do we make this equation more useful?
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9/2/2009 Andrew Lee 5/11 Basic Equation of Fluid Statics Incompressible flow: density remains constant everywhere at all times Liquids may be considered incompressible since their densities
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