Estimate the rate of evaporation of liquid oxygen from a spherical container with 1.8 m inner diameter covered with 30 cm of asbestos insulation. The temperatures of the inner and outer surfaces of...

Estimate the rate of evaporation of liquid oxygen from a spherical container with 1.8 m inner diameter covered with 30 cm of asbestos insulation. The temperatures of the inner and outer surfaces of the insulation are – 183°C and 0°C respectively. The boiling point of oxygen is – 183°C and the latent heat of vaporisation is 212.5 kJ/kg. The thermal conductivity of insulation is 0.157 and 0.125 W/m K at 0°C and – 185°C respectively. Assume that the thermal conductivity of the wall varies as