A2-kW resistance heater wire with thermal conductivity of k= 20W/m · K, a diameter of D =...
A2-kW resistance heater wire with thermal conductivity of k= 20W/m · K, a diameter of D = 4 mm, and a length of L =,0.9 mis used to boil water. If the outer surface temperature of the resistance wire is Ts= 230°C, determine the temperature at the center of the wire.
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