# Consider the composite solid shown. Solid A is a thermally conductive material that is 0.5-cm thick and has a thermal

## Question:

Consider the composite solid shown. Solid A is a thermally conductive material that is 0.5-cm thick and has a thermal conductivity, k_{A}= 50 W/m Â· K. The back side of solid A (x = 0) is thermally insulated. Electrical current is applied to solid A such that 20 W per cm^{3}is generated as heat. Solid B is 0.2-cm thick and has a thermal conductivity of k_{B}= 20 W/m Â· K. The surface of solid B is exposed to air. The surface temperature, T_{s}, of solid B is 80Â°C. The bulk air temperature is constant at 30Â°C. The process is at steady state.

a. What is the heat-transfer rate per unit area (flux) at x = L_{2}? What is the temperature T_{1} at x = L_{1}, the boundary between solid A and solid B?

b. What is the required convective heat-transfer coefficient, h, for the flowing air?

c. What is the temperature T_{0} at x = 0, the insulating side of solid A?

Heat transfer in composite solid.

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**Related Book For**

## Fundamentals Of Momentum Heat And Mass Transfer

**ISBN:** 9781118947463

6th Edition

**Authors:** James Welty, Gregory L. Rorrer, David G. Foster

**Question Details**

**17**

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