Electrical conductors, in the form of parallel plates of
Chapter , Problem 13.102(choose chapter or problem)
Electrical conductors, in the form of parallel plates of length L 40 mm, have one edge mounted to a ceramic insulated base and are spaced a distance w 10 mm apart. The plates are exposed to large isothermal surroundings at Tsur 300 K. The conductor (1) and ceramic (2) surfaces are diffuse and gray with emissivities of 1 0.8 and 2 0.6, respectively. For a prescribed operating current in the conductors, their temperature is T1 500 K. (a) Determine the electrical power dissipated in a conductor plate per unit length, q 1, considering only radiation exchange. What is the temperature of the insulated base, T2? (b) Determine q 1 and T2 when the surfaces experience convection with an airstream at 300 K and a convection coefficient of h 25 W/m2 K. Ceram
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