QI/ Air containing 5% vol CO, is flowing at the rate of 0.30 m'/s at 27c° and total pressure P 1.2 atm. calculate the mass rate of CO: (kg/s).
QI/ Air containing 5% vol CO, is flowing at the rate of 0.30 m'/s at 27c° and total pressure P 1.2 atm. calculate the mass rate of CO: (kg/s).
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Transcribed Image Text:Q1/ Air containing 5% vol CO, is flowing at the rate of 0.30 m'/s at 27c° and total
pressure P = 1.2 atm. calculate the mass rate of CO: (kg/s).
Q2/ CO, is injected in a large volume of pure water at 0 c° and 2 bars pressure.
Calculate the driving force for mass transfer of CO, in water if its solubility in
water 0.004 bar
Q3/ the following equation gives the concentration profile of A diffusing through
semi-infinite medium that has initial concentration CA, = 0 and a constant
interfacial concentration CA, = 10 kmol/m'.
%3D
CA(z, t) = CA, erfe (0 )
thut
Where O
. Experimentai test shows O3 0.70 for a fixed value of z
2 Dt
and t. Calculate the value of CA(z, t).
Q4/ A drop of TCE is dropped in a vesset containing water (20 c°) 2m deep . the
drop is falling at constant velocity = 20 mm/s. The drop is initially of mass m; (mg)
is completely dissolved when it reached the bottom of the vessel. If the dissolution
rate of the drop dm/dt = 1.5 nmg/s. Calculate the initial mass of the drop.
Q5/ A common procedure for increasing the moisture content of air is to bubble it
through a column of water. Assume the air bubbles are spheres of radius r 1mm
and to be in thermal equilibrium with water at 25 c°. How long should the bubbles
remain in water to achieve a vapor concentration at the center that is 98% of the
maximum possible ( saturated concentration ) ? the air is dry when it enters the
water. DA = 0.26x10 m'/s (at 25 c°).
alas : Equation (2.47) chapter 2 is applicable.
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