A long wire of diameter D= 1 mm is submerged in an oil bath of temperature [infinity] T[infinity]= 15°C. The wire has an electrical resistance per unit length of Re′= 0.01 Ω/m. If a current of I= 96 A flows through the wire and the convection coefficient is h= 500 W/m2·K, what is the steady-state temperature of the wire? From the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°C of the steady-state value? The properties of the wire are rho= 8000 kg/m3, c= 500 J/kg·K, and k= 20 W/m·K.
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A long wire of diameter D= 1 mm is submerged in an oil bath of temperature [infinity] T[infinity]= 1...
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Advanced Placement (AP), 03.09.2019 21:30
