chemical engineering 374 - et.byu.edumjm82/che374/fall2016/lecturenotes/lect… · chemical...
TRANSCRIPT
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Chemical Engineering 374
Fluid Mechanics
Pipe Networks
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Spiritual Thought
Alma 26:22
22 Yea, he that repenteth and exerciseth faith, and bringeth forth good works, and prayethcontinually without ceasing—unto such it is given to know the mysteries of God; yea, unto such it shall be given to reveal things which never have been revealed; yea, and it shall be given unto such to bring thousands of souls to repentance, even as it has been given unto us to bring these our brethren to repentance.
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Fluids Roadmap
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Key Points
• Pipe Networks composed of single pipes
• Pipes is series
– Type I – find ΔP
– Type II – find ሶ𝑉
– Type III or IV – find D, Find L – Doesn’t work!!
• Pipes in parallel
– Type I
– Type II
– Type III or IV – Find D, Find L – Doesn't work
• KNOW graphical solution method!!!!
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Pipe Networks
• Most systems are not single pipes
– Central heating in home
– Nuclear reactor cooling systems
– Water supply for cities
– Oil/product pipes in refineries
– Etc.
• Can be decomposed into series/parallel
• Similar analysis to electrical circuits
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Pipes in Series (I)6
12
3
4
• Type 1 problem: Know L, D, ሶ𝑉, then find ΔP
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Pipes in Series (II)
• Type 2 problem: Know ΔP, D, L, then find ሶ𝑉
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Series Example8
12
3L (m) D (m) ε (m)
1 100 0.05 0.00024
2 150 0.045 0.00012
3 80 0.04 0.0002
ΔPt = 320,000 Pa; ignore KL
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Graphical Series9
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MathCAD solution (Pipes in Series)10
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Pipes in Parallel (I)11
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Pipes in Parallel (II)12
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Pipes in Parallel (III)13
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Parallel Example14
1
2
3
L (m) D (m) ε (m)
1 100 0.05 0.00024
2 150 0.045 0.00012
3 80 0.04 0.0002
ሶ𝑉 = .0133 m3/s Pa; Find ΔP
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MathCAD solution (Parallel Pipes)15