Two long pipes, one having a 10-cm-OD and a surface temperature of 300?C, the other having a

Question:

Two long pipes, one having a 10-cm-OD and a surface temperature of 300?C, the other having a 5-cm-OD and a surface temperature of 100?C, are buried deeply in dry sand with their centerlines 15 cm apart. Determine the rate of heat flow from the larger to the smaller pipe per meter length.GIVENTwo long pipes buried deeply in dry sandPipe 1Diameter (D1) = 10 cm = 0.1 m,Surface temperature (T1) = 300?CPipe 2Diameter (D2) = 5 cm = 0.05 m,Surface temperature (T2) = 100?CSpacing between their centerlines (s) = 15 cm = 0.15 mASSUMPTIONSThe heat flow between the pipes is two dimensionalThe system has reached steady stateThe thermal conductivity of the sand isuniform