Problem 3 Helium gas at 25 °C and 4 bars is contained in a spherical glass container of 200 mm inside diameter and 10 mm thickness. If a constant stream of air is passed over the exterior of the vessel, what is the initial rate of mass loss from the container? Assume, the diffusivity of helium through the glass is 0.4 x 10-¹3 m²/s and the molar solubility of helium in the glass is 0.45 x 10³ kmol of He/(m³of solid bar of He).

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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Problem 3 Helium gas at 25 °C and 4 bars is contained in a spherical glass container of 200 mm
inside diameter and 10 mm thickness. If a constant stream of air is passed over the exterior of
the vessel, what is the initial rate of mass loss from the container? Assume, the diffusivity of
helium through the glass is 0.4 x 10-¹3 m²/s and the molar solubility of helium in the glass is 0.45
x 10³ kmol of He/(m³of solid bar of He).
Transcribed Image Text:Problem 3 Helium gas at 25 °C and 4 bars is contained in a spherical glass container of 200 mm inside diameter and 10 mm thickness. If a constant stream of air is passed over the exterior of the vessel, what is the initial rate of mass loss from the container? Assume, the diffusivity of helium through the glass is 0.4 x 10-¹3 m²/s and the molar solubility of helium in the glass is 0.45 x 10³ kmol of He/(m³of solid bar of He).
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