# 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, kA= 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 cm3is generated as heat. Solid B is 0.2-cm thick and has a thermal conductivity of kB= 20 W/m Â· K. The surface of solid B is exposed to air. The surface temperature, Ts, 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 = L2? What is the temperature T1 at x = L1, 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 T0 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
Chapter # 17
Section: Problems
Problem: 30
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