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 37, Problem 39RQ
How does friction-stir welding differ from friction welding?
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Required information
A one-shell-pass and eight-tube-passes heat exchanger is used to heat glycerin (cp=0.60 Btu/lbm.°F) from 80°F to 140°F
by hot water (Cp = 1.0 Btu/lbm-°F) that enters the thin-walled 0.5-in-diameter tubes at 175°F and leaves at 120°F. The total
length of the tubes in the heat exchanger is 400 ft. The convection heat transfer coefficient is 4 Btu/h-ft²°F on the glycerin
(shell) side and 70 Btu/h-ft²°F on the water (tube) side.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Determine the rate of heat transfer in the heat exchanger before any fouling occurs.
Correction factor F
1.0
10
0.9
0.8
R=4.0 3.0 2.0.15 1.0 0.8.0.6 0.4 0.2
0.7
0.6
R=
T1-T2
12-11
0.5
12-11
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
(a) One-shell pass and 2, 4, 6, etc. (any multiple of 2), tube passes
P=
T₁-11
The rate of heat transfer in the heat exchanger is
Btu/h.
!
Required information
Air at 25°C (cp=1006 J/kg.K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg.K) in a cross-flow heat exchanger
with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750
W/K and the mass flow rate of air is twice that of oil.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Air
Oil
80°C
Determine the effectiveness of the heat exchanger.
In an industrial facility, a counter-flow double-pipe heat exchanger uses superheated steam at a temperature of 155°C to
heat feed water at 30°C. The superheated steam experiences a temperature drop of 70°C as it exits the heat exchanger.
The water to be heated flows through the heat exchanger tube of negligible thickness at a constant rate of 3.47 kg/s. The
convective heat transfer coefficient on the superheated steam and water side is 850 W/m²K and 1250 W/m²K,
respectively. To account for the fouling due to chemical impurities that might be present in the feed water, assume
a fouling factor of 0.00015 m²-K/W for the water side.
The specific heat of water is determined at an average temperature of (30 +70)°C/2 = 50°C and is taken to be
J/kg.K.
Cp=
4181
Water
Steam
What would be the required heat exchanger area in case of parallel-flow arrangement?
The required heat exchanger area in case of parallel-flow arrangement is
1m².
Chapter 37 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 37 - What are the two primary functions of the...Ch. 37 - What are the two major roles of the applied...Ch. 37 - Why might resistance welding be considered a form...Ch. 37 - Why is there no need for fluxes or shielding gases...Ch. 37 - Prob. 5RQCh. 37 - What are the three components that contribute to...Ch. 37 - What measures can be taken to reduce the...Ch. 37 - What factors control the resistance between the...Ch. 37 - What are the possible consequences of too little...Ch. 37 - What is the ideal sequence for pressure...
Ch. 37 - Why do the resistance-welding conditions become...Ch. 37 - What magnitude of current might be required to...Ch. 37 - What are some of the changes that can occur in...Ch. 37 - What is the simplest and most widely used form of...Ch. 37 - What is the typical size of a spot-weld nugget?Ch. 37 - What are the two basic types of stationary...Ch. 37 - What is the major advantage of spot-welding guns?Ch. 37 - What are the pros and cons of a resistance spot...Ch. 37 - What are some of the properties that must be...Ch. 37 - What is the most common metal that is spot welded?Ch. 37 - What is the practical limit of the thicknesses of...Ch. 37 - What design features can be altered to permit the...Ch. 37 - What are the two methods used to produce...Ch. 37 - For what products would resistance butt welding be...Ch. 37 - What two limitations of spot welding can be...Ch. 37 - What limits the number of projection welds that...Ch. 37 - What are some of the attractive features of...Ch. 37 - What are some of the primary limitations to the...Ch. 37 - What type of metallurgical problem might be...Ch. 37 - What were some of the limitations that made the...Ch. 37 - What features promote coalescence in cold welding?Ch. 37 - Describe how the roll-bonding process can be used...Ch. 37 - Describe the friction welding process.Ch. 37 - How is inertia welding similar to friction...Ch. 37 - How are surface impurities removed in the...Ch. 37 - Why are inertia welds of more consistent quality...Ch. 37 - What are some of the geometric limitations of...Ch. 37 - How does linear friction welding differ from...Ch. 37 - How does friction-stir welding differ from...Ch. 37 - What are the primary process variables in...Ch. 37 - What are some of the attractive features of...Ch. 37 - What are some of the materials that have been...Ch. 37 - What is the benefit of adding a preheat laser to...Ch. 37 - Describe the friction-stir spot welding process.Ch. 37 - Prob. 45RQCh. 37 - How do ultrasonic vibrations produce a weld?Ch. 37 - What are some of the geometric limitations of...Ch. 37 - What are some of the attractive features of...Ch. 37 - What are the conditions necessary to produce...Ch. 37 - What kinds of materials can be joined by diffusion...Ch. 37 - How might intermediate layers be used to enhance...Ch. 37 - How are surface contaminants removed during...Ch. 37 - If the interface of a weld is viewed in cross...Ch. 37 - What are some typical applications of explosive...Ch. 37 - Many advanced engineering products, as well as...Ch. 37 - Using the Internet or technical literature,...Ch. 37 - Friction-stir processing is an interesting...Ch. 37 - Investigate the various types of power supplies...Ch. 37 - Consider a muffler being made entirely from...Ch. 37 - Prob. 2CSCh. 37 - Prob. 3CSCh. 37 - An alternate material might be one-side...Ch. 37 - Prob. 5CS
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