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CE 230-Engineering Fluid Mechanics

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CE 230-Engineering Fluid Mechanics Lecture # 4and5 Fluid properties (2) Examine velocity distribution in pipe Viscosity Consider two plates separated be a thin film ... – PowerPoint PPT presentation

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Title: CE 230-Engineering Fluid Mechanics


1
CE 230-Engineering Fluid Mechanics
  • Lecture 4and5
  • Fluid properties (2)

2
Examine velocity distribution in pipe
3
Viscosity
  • Consider two plates separated be a thin film of
    fluid. The lower plate is fixed and the upper is
    moving with a constant velocity.
  • Investigate what is happening in the fluid in
    terms of flow or stresses.

4
Viscosity
  • No slip boundary condition
  • Relation between shear stress and velocity
    gradient
  • Classification of fluids

5
Mechanisms of fluid resistance to shear stress
  • Particle cohesion
  • Transfer of molecular momentum
  • Influence of temperature on viscosity

6
Units of viscosity
  • Dynamic viscosity
  • absolute viscosity
  • viscosity
  • Kinematic viscosity

7
  • Influence of temperature on viscosity

8
Classification of fluids according to relation of
shear to strain rate
9
Problems on viscosity
  • Board sliding on an inclined surface separated by
    a thin film of oil
  • Is there a shear stress in the film?
  • lets calculate the terminal velocity

10
(No Transcript)
11
Problem 34
12
Problem 39
  • Calculate the weight of piston given
  • Terminal velocity
  • µ
  • Spacing between piston and cylinder
  • Piston dimensions

13
Problem 2.39
14
Problem 2.41
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