Heat TransferEasy
Question
A cylinder of radius R made of a material of material of thermal conductivity K2 is surrounded by cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective conductivity of the system is
Options
A.K1 + K2
B.K1K2 / (K1 + K2)
C.(K1 + 3K2) / 4
D.(3K1 + K2) / 4
Solution
Let R1 and R2 be the thermal resistance of inner and outer portions. Since, temperature difference at both ends is same, the resistances are in parallel. Hence,
∴
∴
∴ Correct option is (c).
Create a free account to view solution
View Solution FreeMore Heat Transfer Questions
When two ends of a rod wrapped with cotton are maintained at different temperatures and after some time every point of t...The imstryment used to measure the temperature of the source from its thermal radiation is :...A black body is heated from 27oC to 127oC. The ratio of their energies of radiation emitted will be:...Temperature of a body is 4000 C assuming the surrounding themperature to be negligible at what tempearture will be the b...Calculate the energy radiated per minute from the filament of an incandascent lamp at 2000K if the surface area is 5 ...