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3.2 Powell [Trans. Inst. Chem. Eng. Lond., 13, 175 (1935); 18, 36 (1940)] evaporated water from the outside of cylinders into an airstream flowing parallel to the axes of the cylinders. The air temperature was 25°C, and the total pressure standard atmospheric. The results are given by wl = 3.17 x 10-8 (ul) 0.8 Pw - PA where w=water evaporated, g/cm². s PA partial pressure of water in airstream, mmHg Pw = water-vapor pressure at surface temperature, mmHg U= velocity of airstream, cm/s /= length of cylinder, cm L (a) Transform the equation into the form jp (Re,), where Re, is a Reynolds number based on the cylinder length. (b) Calculate the rate of sublimation from a cylinder of napthalene 0.075 m diam by 0.60 m long (3 in diam by 24 in long) into a stream of pure carbon dioxide at a velocity of 6 m/s (20 ft/s) at 1 std atm, 100°C. The vapor pressure of naphthalene at the surface temperature may be taken as 1330 N/m² (10 mmHg) and the diffusivity in carbon dioxide as 5.15 x 10-6 m²/s (0.0515 cm²/s) at STP. Express the results as kilograms naphthalene evaporated per hour. Ans.: 0.386 kg/h.

3.2 Powell [Trans. Inst. Chem. Eng. Lond., 13, 175 (1935); 18, 36 (1940)] evaporated water from the outside of cylinders into an airstream flowing parallel to the axes of the cylinders. The air temperature was 25°C, and the total pressure standard atmospheric. The results are given by wl = 3.17 x 10-8 (ul) 0.8 Pw - PA where w=water evaporated, g/cm². s PA partial pressure of water in airstream, mmHg Pw = water-vapor pressure at surface temperature, mmHg U= velocity of airstream, cm/s /= length of cylinder, cm L (a) Transform the equation into the form jp (Re,), where Re, is a Reynolds number based on the cylinder length. (b) Calculate the rate of sublimation from a cylinder of napthalene 0.075 m diam by 0.60 m long (3 in diam by 24 in long) into a stream of pure carbon dioxide at a velocity of 6 m/s (20 ft/s) at 1 std atm, 100°C. The vapor pressure of naphthalene at the surface temperature may be taken as 1330 N/m² (10 mmHg) and the diffusivity in carbon dioxide as 5.15 x 10-6 m²/s (0.0515 cm²/s) at STP. Express the results as kilograms naphthalene evaporated per hour. Ans.: 0.386 kg/h.

Introduction to Chemical Engineering Thermodynamics
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
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3.2 Powell (Trans. Inst. Chem. Eng. Lond., 13, 175 (1935); 18, 36 (1940)] evaporated water from the outside of cylinders into an airstream flowing parallel to the axes of the cylinders. The air temperature was 25°C, and the total pressure standard atmospheric. The results are given by wl = 3.17 x 10-8(ul)08 Pw - PA where w= water evaporated, g/cm2- s PA - partial pressure of water in airstream, mmHg Pw = water-vapor pressure at surface temperature, mmHg u = velocity of airstream, cm/s 1= length of cylinder, cm (a) Transform the equation into the form jp = 4(Re,), where Re, is a Reynolds number based on the cylinder length. (b) Calculate the rate of sublimation from a cylinder of napthalene 0.075 m diam by 0.60 m long (3 in diam by 24 in long) into a stream of pure carbon dioxide at a velocity of 6 m/s (20 ft/s) at 1 std atm, 100°C. The vapor pressure of naphthalene at the surface temperature may be taken as 1330 N/m2 (10 mmHg) and the diffusivity in carbon dioxide as 5.15 x 10- m2/s (0.0515 cm2/s) at STP. Express the results as kilograms naphthalene evaporated per hour. Ans.: 0.386 kg/h.
Transcribed Image Text:3.2 Powell (Trans. Inst. Chem. Eng. Lond., 13, 175 (1935); 18, 36 (1940)] evaporated water from the outside of cylinders into an airstream flowing parallel to the axes of the cylinders. The air temperature was 25°C, and the total pressure standard atmospheric. The results are given by wl = 3.17 x 10-8(ul)08 Pw - PA where w= water evaporated, g/cm2- s PA - partial pressure of water in airstream, mmHg Pw = water-vapor pressure at surface temperature, mmHg u = velocity of airstream, cm/s 1= length of cylinder, cm (a) Transform the equation into the form jp = 4(Re,), where Re, is a Reynolds number based on the cylinder length. (b) Calculate the rate of sublimation from a cylinder of napthalene 0.075 m diam by 0.60 m long (3 in diam by 24 in long) into a stream of pure carbon dioxide at a velocity of 6 m/s (20 ft/s) at 1 std atm, 100°C. The vapor pressure of naphthalene at the surface temperature may be taken as 1330 N/m2 (10 mmHg) and the diffusivity in carbon dioxide as 5.15 x 10- m2/s (0.0515 cm2/s) at STP. Express the results as kilograms naphthalene evaporated per hour. Ans.: 0.386 kg/h.
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