A copper-silver bimetallic wire, 1 cm in diameter, is prepared by co-extrusion with copper as the core and silver as the outer layer. The desired properties along the axis parallel to the length of the bimetallic wire are as follows:
(a) Thermal conductivity /410 W/(m-K);
(b) Electrical conductivity / 60 × 106Ω-1m-1; and
(c) Weight < 750 g/m. Determine the allowed range of the diameter of the copper core.
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Copper
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Silver
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Density (g/cm3)
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8.96
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10.49
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Electrical conductivity
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59 × 106
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63 × 106
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(Ω-1m-1)
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Thermal conductivity
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401
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429
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[W/(m-K)]
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