Ans is option A • Aluminum wires, 3 mm.3 mm in diameter, areproduced by extrusion. The wires leavethe extrusion dies at an average temper-·ature of 350°C and at a linear"grate of 10 m/min. Before leavingthe extrusion room, the wires are12 cooled to anaverage temperatureof 50°Cby transforming heat tosurrounding air at 25°C with a heattransfer coefficient of 50 W/m² °C.What is the length of the wire coolingSection in the extrusion room? [ k=W/m°C for Al; density=8950Cp = 0.4 kJ/ kg K ]3 3861210-kg/m³;A 22.9 mB.) 17.4 m.c) 30.6mD.) 26.4m

As the biot number is less than 0.1, use the lumped analysis.

Answered: 9 • Aluminum wires, 3 mm in diameter, a…

9 • Aluminum wires, 3 mm in diameter, a produced by extrusion. The wires the extrusion dies at an average to -ature of 350°C and at a line. orate of 10 m/min. Before lean tha 10

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.13P

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

Ans is option A

• Aluminum wires, 3 mm.
3 mm in diameter, are
produced by extrusion. The wires leave
the extrusion dies at an average temper-
·ature of 350°C and at a linear
"grate of 10 m/min. Before leaving
the extrusion room, the wires are
12 cooled to an
average temperature
of 50°C
by transforming heat to
surrounding air at 25°C with a heat
transfer coefficient of 50 W/m² °C.
What is the length of the wire cooling
Section in the extrusion room? [ k=
W/m°C for Al; density
=8950
Cp = 0.4 kJ/ kg K ]
3 386
1
2
10
-
kg/m³;
A 22.9 m
B.) 17.4 m.
c) 30.6m
D.) 26.4m

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