Two slabs, each 120 mm thick, have thermal conductivities of 14.5 W/m.oC and 210 W/m.oC. These are placed in contact, but due to roughness, only 30 percent of area is in contact and the air gap in the remaining area is 0.025 mm thick and is filled with air (k = 0.032 W/m.oC). If the temperature of the face of the hot surface is at 220oC and the outside surface of the other slab is at 30oC, determine: a. Heat flow through the composite system b. The contact resistance and temperature drop in contact.
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Problem 2: (10 point Two slabs, each 120 mm thick have thermal conductivities of 14.5 W/m.°C and 210 W/m.°C. These are placed in contact, but due to roughness, only 30% of area is in contact and the gap in the remaining area is 0.025 mm thick an is filled with air (Kair 0.032 W/m.°C). If the temperature of the face of the hot surface is at 220°C and the outside side surface of other slab is at 30°C a. Sketch the thermal resistance network. (2 points) b. Determine the total resistance. (3 points) C. Determine the heat flow through the composite
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