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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 × 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 × 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 Ka´rma´n 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.
A garden hose of inner radius 1.1 cm carries water at 1.8 m/s. The nozzle at the end has radius 0.25 cm. How fast does the water move through the nozzle
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a long thin sierra pacific power line kilometers long carries a uniformly distributed charge of 8.1 microcoulombs per
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A Girl is pushing on a 45 kg dresser with 300 N of force. The dresser has a coeficient of statice friction of 0.83 and a coeficient of kinetic friction of 0.55. How much is the force of friction on the dresser
It is desired to cool iron parts from 500°F to 100°F by dropping them into water that is initially at 55°F. how many kilograms of water are needed per kilogram of iron
A triangular glass prism with apex angle Φ has index of refraction n. Determine the smallest angle of incidence θ1 for which a light ray can emerge from the other side
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