3332M0D-01F What Is A Fluid 04-06-10

# 3332M0D-01F What Is A Fluid 04-06-10 - Fundamental Concepts...

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© 2001,2010 F. A. Kulacki 3332-01F-1 Fundamental Concepts of Fluid Mechanics What is a fluid? Fluid properties © 2001,2010 F. A. Kulacki 3332-01F-2 What distinguishes a fluid from a solid? The constitutive relation Newton’s Law of Viscosity Overview

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© 2001,2010 F. A. Kulacki 3332-01F-3 What distinguishes a fluid from a solid? © 2001,2010 F. A. Kulacki 3332-01F-4 A fluid will deform continuously in the presence of an unbalanced shear (tangential) force , i.e., fluid strain is continuous in the presence of shear force. What is a fluid?
© 2001,2010 F. A. Kulacki 3332-01F-5 Rigid Surface Fluid Fixed Surface y x F What is a fluid. . . © 2001,2010 F. A. Kulacki 3332-01F-6 Types of fluids A liquid will take the shape of its container but exhibits a free surface. A gas will fill its container completely and does not exhibit a free surface.

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© 2001,2010 F. A. Kulacki 3332-01F-7 y x F Assume the fluid is motionless at t < 0. At t = 0, the force F = (F x ,0,0) is applied. Let us trace the motion of the upper plate and the velocity distribution in the fluid. y x,u F t < 0, V = 0 y x F t ~ 0 + , V > 0 © 2001,2010 F. A. Kulacki 3332-01F-8 y x F t >> 0, V > 0 As time increase well beyond zero, the effect of the moving boundary is felt down to the rigid surface. The velocity distribution is nonlinear.
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3332M0D-01F What Is A Fluid 04-06-10 - Fundamental Concepts...

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