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

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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• 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
Transcribed Image Text:• 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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