chapter 1
DESCRIPTION
fluid mechanicsTRANSCRIPT
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Fluid Mechanics
Chapter 1 Introduction
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Figure 1.3
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Table 1.1
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Table 1.2
F= m aN = kg m/s2
lbf = slug ft/s2Dimensions: HW P 1.10
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Figure 1.6
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Table 1.4
Absolute viscosity and kinematic viscosity for various fluids at 1 atm and 20 C
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Figure A.1
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Figure A.2
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Table A.1
Viscosity and Density of Water: temperature dependent
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Table A.2
Viscosity and Density of Air: temperature dependent
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Figure 1.8
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Figure 1.9
Shear thickening
Shear thinning
Requires finite yield stress before it flows: toothpaste, chocolate, mayonnaise, mustard
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Problem Figure 1.54
See Example 1.10.
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Figure 1.10
SURFACE TENSION
0.073 N/m
Air-mercury interface Y =0.48 N/m
Air-water interface
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Table A.5
Surface tensionVapor pressure andSound speed of Water
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Figure 1.11
Interior of liquid cylinder
Dp = Y/R
Interior of spherical droplet
Dp = 2Y/R
Soap bubble: 4Y/R (two surfaces)
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Figure 1.12
Contact angle less than 90 degrees: wet (Water wets glass surface, 0 degrees Greater than 90: non-wetting mercury-air-glass interface 130 degrees
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Example Figure 1.8
2 p R Y cos q = g p R2 hHW P 1.65.
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Figure 1.13
VAPOR PRESSURE of WATER
Cavitation NumberCa = (pa-pv)/0.5rV2
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Table A.3Properties at 20 C
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UncertaintyP1.90
HW P1.88