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Question

Consider tablets that are contained in a blister package composed of a flat lidding sheet and a second, formed sheet that includes troughs to hold each tablet. The formed sheet is L = 50 micron thick and is fabricated of a Polymer material. Each through is of diameter D = 5 mm and depth = 3 mm. The lidding sheet is fabricated of aluminum foil. The binary diffusion coefficient for water vapor in the polymer is DAB = 6x10-14 m2/s while the aluminum may be assumed to be impermeable to water vapor. For molar concentrations of water vapor in the polymer at the outer and inner surfaces of CA,s1 = 4.5 x10-3 kmol/m3 and CA,s2 = 0.5 x10-3 kmol/m3 , respectively. Determine the rate at which water vapor is transferred through the trough wall to the tablet.

Answer 1

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