Question: Example 4 . 1 0 : The inner sphere of a Diwar flask is 3 0 c m diameter and outer sphere is 3 6

Example 4.10 : The inner sphere of a Diwar flask is 30cm diameter and outer sphere is 36cm diameter. Both spheres are coated for which emissivity is 0.05. Determine the rate at which liquid oxygen (latent heat =21.44kJkg) would evaporate at 90K(-183C) when the outer sphere temperature is 293K(20C). Assume that the other modes of heat transfer are absent.
Example 4.10 : The inner sphere of a Diwar flask is

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