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

Naphthalene is commonly used as a repellent against moths to protect clothing during storage. Consider a 1 cm diameter spherical naphthalene ball hanging in a closet at 25 oC. The density and vapour pressure of naphthalene at 25 oC are 1100 kg/m3 and 11 Pa, respectively and mass diffusivity of naphthalene in air at 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 sublimate completely.

b. If instead of being stored in a closet, the naphthalene 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 observed that 12 g of naphthalene has sublimated in 15 min. Determine the mass transfer coefficient and the flux for mass transfer from naphthalene.

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Amanda K answered 2 years ago

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

Naphthalene is commonly used as a repellent against moths to protect clothing during storage. Consider a 1 cm diameter spherical naphthalene ball hanging in a closet at 25 oC. The density and vapour pressure of naphthalene at 25 oC are 1100 kg/m3 and 11 Pa, respectively and mass diffusivity of naphthalene in air at 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 sublimate...

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

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

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