30.21 The wetted-well column shown in Figure 30.4 is used to humidify a pressurized air stream. Bone-dry air (containing no water vapor) at 2.0 atm and 27°C is introduced to the bottom of the column at a volumetric flow rate of 4000 cm /s. Liquid water is added to the top of the column. The liquid water uniformly coats the inner surface of the tube as a thin liquid film flowing downward. The falling liquid film of water evaporates into the air flowing upward. The wetted-wall column has an inner diameter of 5.0 cm and a length of 6.0 m. The column temperature is maintained at 27°C, and the total system pressure is maintained at 2.0 atm. At 27°C, the kinematic viscosity of air is 0.157 cm2/s and the vapor pressure of liquid water is 0.035 atm. The gas is ideal with R = 82.06 cm³. atm/g mol · K. a. What is the diffusion coefficient of water vapor in air at 2.0 atm and 27°C? b. Determine the Sherwood number for the gas phase. c. Evaluate the gas film coefficient, keG, based on the partial pressure driving force.
30.21 The wetted-well column shown in Figure 30.4 is used to humidify a pressurized air stream. Bone-dry air (containing no water vapor) at 2.0 atm and 27°C is introduced to the bottom of the column at a volumetric flow rate of 4000 cm /s. Liquid water is added to the top of the column. The liquid water uniformly coats the inner surface of the tube as a thin liquid film flowing downward. The falling liquid film of water evaporates into the air flowing upward. The wetted-wall column has an inner diameter of 5.0 cm and a length of 6.0 m. The column temperature is maintained at 27°C, and the total system pressure is maintained at 2.0 atm. At 27°C, the kinematic viscosity of air is 0.157 cm2/s and the vapor pressure of liquid water is 0.035 atm. The gas is ideal with R = 82.06 cm³. atm/g mol · K. a. What is the diffusion coefficient of water vapor in air at 2.0 atm and 27°C? b. Determine the Sherwood number for the gas phase. c. Evaluate the gas film coefficient, keG, based on the partial pressure driving force.
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:30.21 The wetted-well column shown in Figure 30.4 is used to
humidify a pressurized air stream. Bone-dry air (containing no
water vapor) at 2.0 atm and 27°C is introduced to the bottom of
the column at a volumetric flow rate of 4000 cm /s. Liquid water
is added to the top of the column. The liquid water uniformly
coats the inner surface of the tube as a thin liquid film flowing
downward. The falling liquid film of water evaporates into the air
flowing upward. The wetted-wall column has an inner diameter
of 5.0 cm and a length of 6.0 m. The column temperature is
maintained at 27°C, and the total system pressure is maintained
at 2.0 atm. At 27°C, the kinematic viscosity of air is 0.157 cm2/s
and the vapor pressure of liquid water is 0.035 atm. The gas is
ideal with R = 82.06 cm³. atm/g mol · K.
a. What is the diffusion coefficient of water vapor in air at 2.0
atm and 27°C?
b. Determine the Sherwood number for the gas phase.
c. Evaluate the gas film coefficient, keG, based on the partial
pressure driving force.
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