A cylinder having a diameter of 15 cm and a length of 30 cm is initially uniform in temperature at 300C It is suddenly exposed to a convection environment at 20C with h 35W m2 C Properties of the solid are k 2 3W m C, 300 kg m3, and c 840 J kg C Calculate the time for (a) the center and (b) the cen...

L 015 r 0 0075 T i 300C T 20C h 35 Wm 2 C T 120C ...

A cylinder having a diameter of 15 cm and a length of 30 cm is initially uniform

Question:

A cylinder having a diameter of 15 cm and a length of 30 cm is initially uniform in temperature at 300ºC. It is suddenly exposed to a convection environment at 20ºC with h = 35W/m2 · ºC. Properties of the solid are k = 2.3W/m ∙ ºC, ρ = 300 kg/m3, and c = 840 J/kg · ºC. Calculate the time for (a) the center and (b) the center of one face to reach a temperature of 120ºC. Also calculate the heat loss for each case.