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Naphthalene is commonly used as a repellent against moths to protect clothing during storage. Consider a...

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Mechanical Engineering

Naphthalene is commonly used as a repellent againstmoths to protect clothing during storage. Consider a 1 cm diameterspherical naphthalene ball hanging in a closet at 25 oC. Thedensity and vapour pressure of naphthalene at 25 oC are 1100 kg/m3and 11 Pa, respectively and mass diffusivity of naphthalene in airat 25 oC is 0.61 x 10-5 m2/s.


a. consider the variation of diameter with time,determine how long it will take for the naphthalene to sublimatecompletely.


b. If instead of being stored in a closet, thenaphthalene is exposed to dry air flowing at a velocity of 2 m/s.Both the naphthalene and the air were kept at 25 oC. It is observedthat 12 g of naphthalene has sublimated in 15 min. Determine themass transfer coefficient and the flux for mass transfer fromnaphthalene.


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