When the surfaces of two semi-infinite solids at different uniform initial temperatures are brought into intimate contact with each other, the following statements are correct: The heat flux from one surface equals that into the other. The temperature at the interface is constant with time. The temperature at the interface is the same for both solids at the instant of contact.

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Roberto Watkins

Physics

18 September, 21:56

When the surfaces of two semi-infinite solids at different uniform initial temperatures are brought into intimate contact with each other, the following statements are correct: The heat flux from one surface equals that into the other. The temperature at the interface is constant with time. The temperature at the interface is the same for both solids at the instant of contact.

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Gavin Meza · Answer 1

semi-infinite solid initially at a uniform temperature of 400 ◦C is cooled at its surface by convection. The cooling fluid at a constant temperature of 200 ◦C has a convective coefficient (ha) of 250 W/m2. K. The physical properties of the solid: k = 20 W/m. K and α = 4 * 10-5 m2/s. Using Δx = 0.04 m and Δt = 10 s. Write the finite difference equations describing the transient heat transfer of the first five Δx and the temperature profile after 30 s.