The outer surfaces of the plane composite wall (A, B and C) are exposed to a fluid at 25oC and a convection heat transfer coefficient of 1000 W/m2 oC. The thickness of walls A, B and C are 30, 60 and...

The outer surfaces of the plane composite wall (A, B and C) are exposed to a fluid at 25oC and a convection heat transfer coefficient of 1000 W/m2 oC. The thickness of walls A, B and C are 30, 60 and 20 mm, respectively. The thermal conductivity of walls material A, B and C are 25, 15 and 50 W/m oC, respectively. The middle wall (B) has a uniform heat generation, while there is no generation in walls A and C. The outer surfaces temperature of A and C are 132oC and 158oC, respectively. At steady state-one dimensional heat transfer conditions calculate: (1) The temperature in wall B at a distance of 10 mm from interphase of walls B and C. (2) The temperature in wall B at a distance of 5 mm from interphase of walls B and A. (3) The temperature at the middle of wall B