The production of a biodegradable bottle involves forcing air at temperature of 20 ̊C, and relative humidity of 40% to flow at a velocity of 2.0m/s over the surface of a polymer solution dissolved in water. The length parallel to flow is 50 cm and the average surface temperature is 16 ̊C (a) Estimate the amount of water evaporated per hr/m2 of surface. Data: Mass diffusivity, D=0.256 cm2/s; Partial pressure of water vapour at 20 ̊C and relative humidity 40% is 0.011 bar; at 16 ̊C and saturated, the vapour pressure is 0.017bar; Viscosity and density of air are: 18.38 X10-7 Pa and 1.22kg/m3, respectively; Specific water vapour constant, Rw= 461.889 J/kg.
The production of a biodegradable bottle involves forcing air at temperature of 20 ̊C, and relative humidity of 40% to flow at a velocity of 2.0m/s over the surface of a polymer solution dissolved in water. The length parallel to flow is 50 cm and the average surface temperature is 16 ̊C (a) Estimate the amount of water evaporated per hr/m2 of surface. Data: Mass diffusivity, D=0.256 cm2/s; Partial pressure of water vapour at 20 ̊C and relative humidity 40% is 0.011 bar; at 16 ̊C and saturated, the vapour pressure is 0.017bar; Viscosity and density of air are: 18.38 X10-7 Pa and 1.22kg/m3, respectively; Specific water vapour constant, Rw= 461.889 J/kg.
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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Question
The production of a biodegradable bottle involves forcing air at temperature of
20 ̊C, and relative humidity of 40% to flow at a velocity of 2.0m/s over the surface
of a polymer solution dissolved in water. The length parallel to flow is 50 cm and
the average surface temperature is 16 ̊C
(a) Estimate the amount of water evaporated per hr/m2 of surface.
Data: Mass diffusivity, D=0.256 cm2/s; Partial pressure of water vapour at 20 ̊C
and relative humidity 40% is 0.011 bar; at 16 ̊C and saturated, the vapour
pressure is 0.017bar; Viscosity and density of air are: 18.38 X10-7 Pa and
1.22kg/m3, respectively; Specific water vapour constant, Rw= 461.889 J/kg.
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