Liquid oxygen is stored in a thin-walled, spherical container 0.8 m in diameter, which is enclosed within a second thin-walled, spherical container 1.2 m in diameter. the opaque, diffuse, gray container surfaces have an emissivity of 0.05 and are separated by an evacuated space. if the outer surface is at 275 k and the inner surface is at 95 k, what is the mass rate of oxygen lost due to evaporation, in kg/s? (the latent heat of vaporization of oxygen is 2.13 x 105 j/kg.)

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k