mass transfer
Posted: Fri Jul 01, 2022 7:23 am
mass transfer
Problem #4 Several thin sheets of naphthalene, 0.25 cm thick and 10 cm square, are arranged parallel to each other with their centers at 1 cm intervals. Air at 273 K and 1.013 x 105 Pa enters this sandwich arrangement with a bulk velocity of 15 m/s. At 273 K, the mass diffusivity for naphthalene in air is 5.14 x 10-6 m²/s, the Schmidt number is 2.57, and the vapor pressure of naphthalene is 1.0 Pa. Determine the concentration of naphthalene in the air as it leaves the arrangement, evaluating the mass-transfer coefficient using the (a) Reynolds analogy: (b) von Karman analogy; (c) Chilton-Colburn analogy. Determine the length of time the sheets must be exposed until half of their mass will be sublimed under these conditions.
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