Liquid nitrogen is stored in a thin-walled sphericalvessel

Chapter 9, Problem 9.107

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Liquid nitrogen is stored in a thin-walled sphericalvessel of diameter Di?1 m. The vessel is positionedconcentrically within a larger, thin-walled sphericalcontainer of diameter Do?1.10 m, and the interven-ing cavity is filled with atmospheric helium.Under normal operating conditions, the inner and outersurface temperatures are Ti?77 K and To?283 K. Ifthe latent heat of vaporization of nitrogen is 2?105J/kg,what is the mass rate m.(kg/s) at which gaseous nitro-gen is vented from the system?

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