brad peterson, p.e. - njut2009fall.weebly.com · lesson 1, properties of fluids, 2009 sept 04 ......
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Brad Peterson, P.E.
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SFRIDAYS – 14:00 to 15:40
FRIDAYS – 16:10 to 17:50
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CLASS INFO:CLASS INFO: Class Website: Class Website:
https://sites.google.com/site/njut2009fall/
Mr. Peterson’s Email Address: bradpeterson@engineer [email protected]
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CLASS SCHEDULECLASS SCHEDULE Lesson 1, Properties of Fluids, 2009 Sept 04 Lesson 2, Fluid Statics , 2009 Sept 11 Lesson 3, Hydrostatic Force on Surfaces , 2009 Sept 18 Lesson 4, Buoyancy and Flotation
L 5 T l ti d R t ti f Li id M Lesson 5, Translation and Rotation of Liquid Masses Lesson 6, Dimensional Analysis and Hydraulic Similitude Lesson 7, Fundamentals of Fluid Flow
L 8 Fl i Cl d C d it Lesson 8, Flow in Closed Conduits Lesson 9, Complex Pipeline Systems Lesson 10, Flow in Open Channels L 11 Fl f C ibl Fl id Lesson 11, Flow of Compressible Fluids Lesson 12, Measurement of Flow of Fluids Lesson 13, Forces Developed by Moving Fluids Lesson 14 Fluid Machinery Lesson 14, Fluid Machinery
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Lesson 2 Fluid StaticsLesson 2, Fluid Statics1. Introduction 6. Vacuum and 1. Introduction2. Fluid Pressure3. Difference in
Atmospheric Pressure7. Absolute and Gage
PPressure4. Pressure Head
Pressure8. Barometers
Pi t d5. Pressure Variations in a Compressible Fluid
9. Piezometers and Manometers
Fluid
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2 1 What is Fluid Pressure?2.1. What is Fluid Pressure?
Force acting against and distributed over a surfaceover a surface.
Force may be exerted by a solid, liquid or gasor gas.
Often, force is the weight of materialFl id i di tl b d th Fluid pressure varies directly by depth –very important consideration.
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2 2 Fluid Pressure2.2. Fluid Pressure
Transmitted with equal intensity in all directionsdirections
Acts normal to any plane M d b i f f Measured by various forms of gages In this class, we refer to gage or relative
l th i t t dpressures unless otherwise stated.
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2 2 Fluid Pressure (Cont)2.2. Fluid Pressure (Cont)Pressure (p) = force (F) divided by area (A)Pressure (p) force (F) divided by area (A)
2
F Np Pa 2pA m
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2 3 Difference in Pressure2.3. Difference in Pressure
Difference in pressure at two points at different levels in a liquid is expresseddifferent levels in a liquid is expressed as:
2 1 2 1( )p p h h
(remember that = unit weight)
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2.3. Difference in Pressure (cont)2.3. Difference in Pressure (cont)
2 1 2 1( )p p h h
If p1 is on a free surface and (h2 – h1) is
2 1 2 1( )p p h h
positive downward, then the equation becomes:
p hThese equations apply as long as γ is constant so applies to water and most ppliquids. Not to a gases.
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2 4 Pressure Head2.4. Pressure Head Pressure Head (or just Head) is the Pressure Head (or just Head) is the
height of a column of fluid that will produce a given intensity of pressure, p g y p ,so:
p hp is rearranged to:
ph
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2.5. Pressure Variations in a CCompressible Fluid Note that pressure variations in a Note that pressure variations in a
compressible fluid (normally a gas) are usually small because of the small unit yweight (γ)
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2.6. Vacuum and Atmospheric Pressure Vacuum = space with less that atmospheric Vacuum space with less that atmospheric
pressure Atmospheric pressure refers to prevailing Atmospheric pressure refers to prevailing
pressure in the air around us At sea level standard atmospheric pressure At sea level, standard atmospheric pressure
is:101.3 , orp kPa760 of mercury, or
1 t h
ph mm1 atmosphere
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Mercury BarometerMercury Barometer
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Compute h for BarometerCompute h for Barometer
ph
101.3p kPa
Atmospheric pressure
2101 3 103 3 /kP kN 2101.3 103.3 /p kPa kN m
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Compute h for Barometer (cont)Compute h for Barometer (cont):Compute
13.6Specific gravity of mercury = Remember,
weight of substance specific gravity = = weight of equal amount of water
= specific gravity weight of equal amount of water
313.6 9.79 /kN m = 3133.1 /kN m13.6 9.79 /kN m 133.1 /kN m
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Compute h for Barometer (cont)Compute h for Barometer (cont)
ph
2
3
101.3 /p kN m3
2
133.1 /
101 3 / /
kN m
kN m
3101.3 / / 0.76 760133.1 /
kN mh m mmkN m
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2 8 Barometers2.8. Barometers The device above is a basic barometer The device above is a basic barometer Measures atmospheric pressure Atmospheric pressure is sometimes Atmospheric pressure is sometimes
measured in mm of mercury and at sea level is 760mmlevel is 760mm
Varies slightly based on weather conditionsconditions
Varies inverse to elevation –atmosphereic pressure is lower at higheratmosphereic pressure is lower at higher elevations.
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What if the apparatus is filled with Water?
C :101 3
hp kPa
Compute Atmospheric pressure
2
101.3
101.3 103.3 /
p kPa
p kPa kN m
Atmospheric pressure
p
No Change from Mercury Example
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“Water” BarometerWater Barometer
Water
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Compute h for Water in B ( )Barometer (cont)
:Compute 1.0
pSpecific gravity of water = Remember,
e e be ,
weight of substance specific gravity = = weight of equal amount of water
weight of equal amount of water
= specific gravity weight of equal amount of water
31 0 9 79 / 9 79kN
specific gravity weight of equal amount of water
= 3/kN31.0 9.79 / 9.79kN m = 3/kN m
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Compute h for Water in B ( )Barometer (cont)
ph
2
3
101.3 /p kN m3
2
9.79 /
101 3 / /
kN m
kN m
3101.3 / / 10.39.79 /
kN mh mkN m
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“Water” BarometerWater Barometer
10 310.3 m
Water
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2.7. Absolute and Gage Pressure Absolute pressure is the lowest possible Absolute pressure is the lowest possible
pressure and Gage pressure uses atmospheric Gage pressure uses atmospheric
pressure as its base
0 101.3kPa Atmospheric pressure = 101.3kPaAbsolute pressure atmospheric pressure
101.3 101.3kPa kPa Gage pressure = atmospheric pressureGage pressure = absolute pressure
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2.9. Piezometers and Manometers
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Simple PiezometerSimple Piezometer
1 1m1.1m
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For the Simple Piezometer above, calculate pressure at A
12 34kN3
12.34Weight of glycerin kNm
3
12.34Pr essure at A 1.1kNp h m 3
13.57 13 57
mkN kP2 13.57kPa
m
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Problem 1Problem 1Determine the gage pressure in kPa at aDetermine the gage pressure in kPa at a
depth of 10.0 meters below the free surface of a body of water.y
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Problem 1 LayoutProblem 1, Layout
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Problem 1 SolutionProblem 1, Solution
39.79 /kN m Weight of water
p h
9 79 97 9kN kN3 2
9.79 97.910.0 97.9kN kNp m kPam m
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Problem 2Problem 2Find the pressure at the bottom of a tankFind the pressure at the bottom of a tank
containing glycerin under pressure as shown in following figure.g g
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Problem 2 LayoutProblem 2, Layout
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Problem 2 SolutionProblem 2, Solution
50p hpressure at bottom =
2
505050
p hkNkPa
pressure at bottom =
2
12.34m
kNweight of glycerin = 3mweight of glycerin =
2 3 350 12.34 74.682 74.68kN kN kNp m kPa
2 3 3m m m
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Problem 3Problem 3
(a) Find the elevation of the liquid surface in Piezometer A(b) The elevation of mercury in Piezometer B(b) The elevation of mercury in Piezometer B(c) The pressure at the bottom, Elevation 0
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Problem 3 SolutionProblem 3, Solution
( ) Th li id i Pi A(a) The liquid in Piezometer A ill i h l iwill rise to the same elevation
as the top of the tank.
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Problem 3 Solution (cont)Problem 3, Solution (cont)9.79( ) (0 72 )(1 7 )kNb h 3( ) (0.72 )(1.7 )
11 98
Ab p h mm
kN
2
2
11.98 11.98
/
kN kPam
k
2
3
11.98 / / 0.519(2.36 9.79 / )
AkN mh p
kN m
0.3 0.519 0.819TOTALh m
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Problem 3 Solution (cont)Problem 3, Solution (cont)
( ) 0
3
( ) 11 98 (2 36 9 79 / )(0 3 )
A Bc p p pkPa kN m m
11.98 (2.36 9.79 / )(0.3 )18.9
kPa kN m mkPa
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CLASS SCHEDULECLASS SCHEDULE Lesson 1, Properties of Fluids, 2009 Sept 04 Lesson 2, Fluid Statics , 2009 Sept 11 Lesson 3, Hydrostatic Force on Surfaces , 2009 Sept 18 Lesson 4, Buoyancy and Flotation
L 5 T l ti d R t ti f Li id M Lesson 5, Translation and Rotation of Liquid Masses Lesson 6, Dimensional Analysis and Hydraulic Similitude Lesson 7, Fundamentals of Fluid Flow
L 8 Fl i Cl d C d it Lesson 8, Flow in Closed Conduits Lesson 9, Complex Pipeline Systems Lesson 10, Flow in Open Channels L 11 Fl f C ibl Fl id Lesson 11, Flow of Compressible Fluids Lesson 12, Measurement of Flow of Fluids Lesson 13, Forces Developed by Moving Fluids Lesson 14 Fluid Machinery Lesson 14, Fluid Machinery
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Vocabulary for Next WeekVocabulary for Next Week Hydrostatic force Horizontal component Hydrostatic force Plane Magnitude
p Curved Circumferentialg
Direction Sense
Tension Longitudinal
Intensity Center of gravity
Dams Stability
Moment of inertia Centroid
Uplift Sliding Resistance