Stromingsleer_college4 [Compatibility Mode]
Transcript of Stromingsleer_college4 [Compatibility Mode]
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1Fluid Mechanics – Lecture 4
Fluid mechanics(wb1225)
Lecture 4:control volume analysis
Momentum equation
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2Fluid Mechanics – Lecture 4
Conservation of momentum
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3Fluid Mechanics – Lecture 4
Conservation of momentum
momentum flux:
• pressure forces• forces due to viscous stresses• forces by solid bodies that protrude through surface
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4Fluid Mechanics – Lecture 4
Example 3.9
maximum momentum transfer when jet direction is reversed
small angle deflection; forceis normal to vane, and F ~ θ
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5Fluid Mechanics – Lecture 4
Example
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6Fluid Mechanics – Lecture 4
Hydraulic jump
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7Fluid Mechanics – Lecture 4
2004 Tsunami
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8Fluid Mechanics – Lecture 4
Hydraulic jump
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9Fluid Mechanics – Lecture 4
Example 3.11
1D inlet
streamline, no mass flux,no shear
2D outlet
streamline, V = 0shear forces
Boundary layer over a flat plate
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10Fluid Mechanics – Lecture 4
Example 3.11
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11Fluid Mechanics – Lecture 4
Example 3.12
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12Fluid Mechanics – Lecture 4
Example: Pelton wheel
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13Fluid Mechanics – Lecture 4
Summary• Chapter 3: 3.1-3.4
• Examples: 3.1-3.6
• Problems: 3.36, 3.50, 3.51, 3.73, 3.86
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14Fluid Mechanics – Lecture 4
Source1. Multimedia Fluid Mechanics DVD-ROM, G. M. Homsy, University of California, Santa Barbara2. Frank M. White, Fluid Mechanics, McGraw-Hill Series in Mechanical Engineering3. Pelton Turbine, http://www.eumarine.com