7-I solution.pdf - CHE 160B Class Problem 7-1 Names S c9 bL(Tl ~ f A slab of wood 12 by 12 by 1 is exposed to relatively dry air The internal liquid

7-I solution.pdf - CHE 160B Class Problem 7-1 Names S c9...

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CHE 160B Class Problem 7-1 Names S c9 bL(Tl ~ f'...} A slab of wood, 12" by 12" by 1" is exposed to relatively dry air. The internal liquid diffuses to the surface where it evaporates into the passing air stream. The moisture content on the surface remains constant at 7 wt%. After 10 hr of drying, the center moisture content decreases from 15 to 10 wt%. If the convective mass transfer coefficient can be considered sufficiently large in value that the relative resistance, m, is essentially zero, calculate the diffusion coefficient. d\~s~(?n..S lLl~ 3 Cf, '> :,-'/ffl
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A value of kG was experimentally determined to be 1.08 Ib·mol/h·ft1..atm for f:. diffusing through stagnant B. For the same
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