Problem 1 Estimate the time required to evaporate 5% of a solid naphthalene sphere (moth ball) having an initial diameter of 0.3 in. when suspended in an effectively infinite amount of still air at 115 °F. At this temperature, the vapor pressure of naphthalene is 1.546 lb/ft² and its density is 71.4 lb/ft³. For the present purposes, neglect any variation in vapor pressure with changing curvature of the surface and assume that the rate of sublimation is constant and equal to the initial rate of sublimation. For these conditions DNapth-Air is 0.2665 ft²/h and the pressure is 1 atm.
Problem 1 Estimate the time required to evaporate 5% of a solid naphthalene sphere (moth ball) having an initial diameter of 0.3 in. when suspended in an effectively infinite amount of still air at 115 °F. At this temperature, the vapor pressure of naphthalene is 1.546 lb/ft² and its density is 71.4 lb/ft³. For the present purposes, neglect any variation in vapor pressure with changing curvature of the surface and assume that the rate of sublimation is constant and equal to the initial rate of sublimation. For these conditions DNapth-Air is 0.2665 ft²/h and the pressure is 1 atm.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Problem 1 Estimate the time required to evaporate 5% of a solid naphthalene sphere (moth ball)
having an initial diameter of 0.3 in. when suspended in an effectively infinite amount of still air
at 115 °F. At this temperature, the vapor pressure of naphthalene is 1.546 lb/ft² and its density is
71.4 lb/ft³. For the present purposes, neglect any variation in vapor pressure with changing
curvature of the surface and assume that the rate of sublimation is constant and equal to the
initial rate of sublimation. For these conditions DNapth-Air is 0.2665 ft²/h and the pressure is 1 atm.
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