Question

P4: 20% What is the amount of radiant power leaving the opening of a cylindrical cavity with the diameter of 16 mm and depth of 24 mm with the emissivity of 9 and temperature of 1200 K. The surrounding temperature is 300 K. P5: 10%

Answer 1

Solution Py depth T=11200k Ta = 300k -24m given en that diameter (d) = 16mm surrounding depth = 24mm Emissivity CE) = 0.9 Ti = 12ook diameter (d) =16mm Tz (surrounding) = 3ook very small body kept in very large surrounding Fia=! Fia= A

(2,-2) net 6 CT," TY) AI でも AN + to Az Ez (21-3) net radius= 8mm -0.008m G CT, " - T24) A, E, A, E where Boltzmann's constant Stefan's 6 = 5.67 X10 watt mZKY = 5.67 X 100 C12004– 3004x RAX 0-0 08X 0.024X0-9 (91-2) net (91-2) net 127-15 W a Amount of radiant power leaving the opening of cylindrical carity