The experiment shown below is used to estimate mass transfer coefficients. In the present experiment, two portions of the inside of the tube are coated with naphthalene, a volatile solid. The tube is maintained at 1008C and 1.0 atm total system pressure. At 1008C, the sublimation vapor pressure of solid naphthalene is 1.0 mmHg. The inner diameter of the tube is 2.0 cm. The total length of the tube is 100 cm, and each section of the tube bearing the naphthalene is 2.0 cm. Air enters the tube at a Air + naphthalene vapor 20 cm 20 cm 100 cm Solid naphthalene d = 2 cm Air flow 4.5 g/min mass flow rate of 4.5 g/min. The measured outlet mole fraction of naphthalene vapor in the exit of the tube is 0.0066, as determined by gas chromatography. The diffusion coefficient of naphthalene in air is 0:086 cm2/sat 1008C and 1.0 atm total system pressure. At this temperature and pressure, the kinematic viscosity of air is 0:25 cm2/s and the density of air is 9:5 104 g/cm3. a. Develop a material balance model to predict the mole fraction of naphthalene vapor exiting the tube. b. Based on your model and the data given in the problem statement, estimate kc. c. Now, evaluate the mass-transfer coefficient using the appropriate established correlation and compare your results to part (b)
FUNDAMENTALS OF MOMENTUM, HEAT AND
Que 30.17
The experiment shown below is used to estimate mass
transfer coefficients. In the present experiment, two portions of
the inside of the tube are coated with naphthalene, a volatile
solid. The tube is maintained at 1008C and 1.0 atm total system
pressure. At 1008C, the sublimation vapor pressure of solid
naphthalene is 1.0 mmHg. The inner diameter of the tube is
2.0 cm. The total length of the tube is 100 cm, and each section of
the tube bearing the naphthalene is 2.0 cm. Air enters the tube at a
Air + naphthalene vapor
20 cm
20 cm
100 cm
Solid
naphthalene
d = 2 cm
Air flow
4.5 g/min
mass flow rate of 4.5 g/min. The measured outlet mole fraction
of naphthalene vapor in the exit of the tube is 0.0066, as
determined by gas chromatography. The diffusion coefficient
of naphthalene in air is 0:086 cm2/sat 1008C and 1.0 atm total
system pressure. At this temperature and pressure, the kinematic
viscosity of air is 0:25 cm2/s and the density of air is
9:5 104 g/cm3.
a. Develop a material balance model to predict the mole
fraction of naphthalene vapor exiting the tube.
b. Based on your model and the data given in the problem
statement, estimate kc.
c. Now, evaluate the mass-transfer coefficient using the appropriate established correlation and compare your results to
part (b)
30.18 Fa
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