DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 13, Problem 52RQ
What is “yield,” and how does it relate to the number and size of risers?
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Students have asked these similar questions
Problem (17): water flowing in an open channel of a rectangular cross-section with width (b) transitions from a
mild slope to a steep slope (i.e., from subcritical to supercritical flow) with normal water depths of (y₁) and
(y2), respectively.
Given the values of y₁ [m], y₂ [m], and b [m], calculate the discharge in the channel (Q) in [Lit/s].
Givens:
y1 = 4.112 m
y2 =
0.387 m
b = 0.942 m
Answers:
( 1 ) 1880.186 lit/s
( 2 ) 4042.945 lit/s
( 3 ) 2553.11 lit/s
( 4 ) 3130.448 lit/s
Problem (14): A pump is being used to lift water from an underground
tank through a pipe of diameter (d) at discharge (Q). The total head
loss until the pump entrance can be calculated as (h₁ = K[V²/2g]), h
where (V) is the flow velocity in the pipe. The elevation difference
between the pump and tank surface is (h).
Given the values of h [cm], d [cm], and K [-], calculate the maximum
discharge Q [Lit/s] beyond which cavitation would take place at the
pump entrance. Assume Turbulent flow conditions.
Givens:
h = 120.31 cm
d = 14.455 cm
K = 8.976
Q
Answers:
(1) 94.917 lit/s
(2) 49.048 lit/s
( 3 ) 80.722 lit/s
68.588 lit/s
4
Problem (13): A pump is being used to lift water from the bottom
tank to the top tank in a galvanized iron pipe at a discharge (Q).
The length and diameter of the pipe section from the bottom tank
to the pump are (L₁) and (d₁), respectively. The length and
diameter of the pipe section from the pump to the top tank are
(L2) and (d2), respectively.
Given the values of Q [L/s], L₁ [m], d₁ [m], L₂ [m], d₂ [m],
calculate total head loss due to friction (i.e., major loss) in the
pipe (hmajor-loss) in [cm].
Givens:
L₁,d₁
Pump
L₂,d2
오
0.533 lit/s
L1 =
6920.729 m
d1 =
1.065 m
L2 =
70.946 m
d2
0.072 m
Answers:
(1)
3.069 cm
(2) 3.914 cm
( 3 ) 2.519 cm
( 4 ) 1.855 cm
TABLE 8.1
Equivalent Roughness for New Pipes
Pipe
Riveted steel
Concrete
Wood stave
Cast iron
Galvanized iron
Equivalent Roughness, &
Feet
Millimeters
0.003-0.03 0.9-9.0
0.001-0.01 0.3-3.0
0.0006-0.003 0.18-0.9
0.00085
0.26
0.0005
0.15
0.045
0.000005
0.0015
0.0 (smooth) 0.0 (smooth)
Commercial steel or wrought iron 0.00015
Drawn…
Chapter 13 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 13 - What are the six activities that are conducted on...Ch. 13 - What is materials processing?Ch. 13 - What are the five basic families of...Ch. 13 - Describe the capabilities of the casting process...Ch. 13 - What are some of the various mold materials and...Ch. 13 - How might the desired production quantity...Ch. 13 - Why is it important to provide a means of venting...Ch. 13 - What types of problem or defect can occur if the...Ch. 13 - Why might product removal be less of a problem...Ch. 13 - What is a casting pattern? Flask? Core? Mold...
Ch. 13 - In a horizontally parted two-part mold, what is...Ch. 13 - What are some of the components that combine to...Ch. 13 - What is a parting line or parting surface?Ch. 13 - What is draft, and why is it used?Ch. 13 - Why is it important to control the solidification...Ch. 13 - What are the two stages of solidification, and...Ch. 13 - Why is it that most solidification does not begin...Ch. 13 - Why might it be desirable to promote nucleation in...Ch. 13 - Nucleation generally begins at preferred sites...Ch. 13 - Why might directional solidification be desirable...Ch. 13 - Describe some of the key features observed in the...Ch. 13 - What is superheat?Ch. 13 - Prob. 23RQCh. 13 - What is a liquidus temperature? A solidus...Ch. 13 - What is the freezing range for a metal or alloy?Ch. 13 - Discuss the roles of casting volume and surface...Ch. 13 - What characteristics of a specific casting process...Ch. 13 - What is the correlation between cooling rate and...Ch. 13 - What is the chill zone of a casting, and why does...Ch. 13 - Which of the three regions of a cast structure is...Ch. 13 - What is dross or slag, and how can it be prevented...Ch. 13 - What are some of the possible approaches that can...Ch. 13 - What is a misrun or cold shut, and what causes...Ch. 13 - What is fluidity, and how can it be measured?Ch. 13 - What is the most important factor controlling the...Ch. 13 - What defect can form in sand castings if the...Ch. 13 - Why is it important to design the geometry of the...Ch. 13 - Why might it be preferable to attach gates to the...Ch. 13 - Prob. 39RQCh. 13 - What are some desirable features in the sprue...Ch. 13 - What is a choke, and how does its placement affect...Ch. 13 - What features can be incorporated into the gating...Ch. 13 - What are some of the materials and designs of...Ch. 13 - What factors might influence the positioning of...Ch. 13 - What features of the metal being cast tend to...Ch. 13 - What are the three stages of contraction or...Ch. 13 - Why is it more difficult to prevent shrinkage...Ch. 13 - What steps can be taken to compensate for the...Ch. 13 - During what stage of shrinkage might hot tears...Ch. 13 - What is the role of a riser?Ch. 13 - Why is it desirable to design a casting to have...Ch. 13 - What is yield, and how does it relate to the...Ch. 13 - Based on Chvorinovs rule, what would be an ideal...Ch. 13 - Define the following riser-related terms: top...Ch. 13 - What assumptions were made when using Chvorinovs...Ch. 13 - Discuss aspects relating to the connection between...Ch. 13 - What is the purpose of a chill? Of an insulating...Ch. 13 - What are some materials that are commonly used to...Ch. 13 - What types of modifications or allowances are...Ch. 13 - Prob. 60RQCh. 13 - What is the purpose of a draft or taper on pattern...Ch. 13 - Why is it desirable to make the pattern allowances...Ch. 13 - What additional adjustment or correction must be...Ch. 13 - What are some of the features of the casting...Ch. 13 - Prob. 65RQCh. 13 - What are some design recommendations for inside...Ch. 13 - What are some appearance considerations in parting...Ch. 13 - Prob. 68RQCh. 13 - Prob. 69RQCh. 13 - Using Chvorinovs rule as presented in the text...Ch. 13 - Reposition the riser in Problem 1 so that it sits...Ch. 13 - A rectangular casting having the dimensions 3 in....Ch. 13 - A cylinder with a diameter of 2.5 in. and a height...Ch. 13 - Figure 13.Ashows the wall profile of a cast iron...Ch. 13 - Investigate various experimental techniques to...Ch. 13 - Porosity within a casting can be either...Ch. 13 - The chapter text describes various materials that...Ch. 13 - What is the most likely source of the gas bubbles?...Ch. 13 - What factors may have caused the penetration...Ch. 13 - Prob. 3CSCh. 13 - Prob. 4CSCh. 13 - Prob. 5CS
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- The flow rate is 12.275 Liters/s and the diameter is 6.266 cm.arrow_forwardAn experimental setup is being built to study the flow in a large water main (i.e., a large pipe). The water main is expected to convey a discharge (Qp). The experimental tube will be built at a length scale of 1/20 of the actual water main. After building the experimental setup, the pressure drop per unit length in the model tube (APm/Lm) is measured. Problem (20): Given the value of APm/Lm [kPa/m], and assuming pressure coefficient similitude, calculate the drop in the pressure per unit length of the water main (APP/Lp) in [Pa/m]. Givens: AP M/L m = 590.637 kPa/m meen Answers: ( 1 ) 59.369 Pa/m ( 2 ) 73.83 Pa/m (3) 95.443 Pa/m ( 4 ) 44.444 Pa/m *******arrow_forwardFind the reaction force in y if Ain = 0.169 m^2, Aout = 0.143 m^2, p_in = 0.552 atm, Q = 0.367 m^3/s, α = 31.72 degrees. The pipe is flat on the ground so do not factor in weight of the pipe and fluid.arrow_forward
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