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Posted Date: 25 Jan 2009 Posted By: ram Member Level: Diamond
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2008 Jawaharlal Nehru Technological University Chemical engineering IV B.Tech. I Semester Regular Examinations, November -2008 TRANSPORT PHENOMENA Question paper
Code No: R05410801 Set No. 1
IV B.Tech I Semester Regular Examinations, November 2008
TRANSPORT PHENOMENA
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What are the methods available for estimating the viscosity of dense gases and
liquids?
(b) Predict the viscosity of molecular oxygen at 20oC and 1 atm.
Data: At 200K and 1atm : s = 3.433Ao and
µ = 1.086. [8+8]
2. Calculate the thermal conductivity of a mixture containing 20 mole% CO2 and
80mole% H2 at 1 atm and 300K. [16]
Data:
Species a Mole fractionx M µ × 105(pas.s) K (w/m.k)
CO2 1 0.2 44.01 1.506 0.01661
H2 2 0.8 2.016 0.8944 0.1789
3. (a) What is diffusion? What factors may cause diffusion to occur?
(b) Explain about molecular mass transport?
(c) Show that jA = -?DAB ?wA [4+6+6]
4. Consider a fluid (of density ?) in incompressible, laminar flow in a plane narrow
slit of length L and width W formed by two flat parallel walls that are a distance
2B apart. End effects may be neglected because B<< W << L. The fluid flows
under the influence of both a pressure difference p and gravity.
(a) Using a differential shell momentum balance, determine expressions for the
steady-state shear stress distribution and the velocity profile for a Newtonian
fluid (of viscosity µ).
(b) Obtain expressions for the maximum velocity, average velocity and the mass
flow rate for slit flow. [16]
5. A chemical reaction is carried out in a packed bed flow reactor. The fluid enters
with a uniform temperature T1 and mass flow rate ‘w’. The radius of the fixed bed
is ‘R’. The reactor extends from z=+8 to z=-8 and it is divided into three zones.
The reaction zone (0exit zones are packed with pellets that are physically similar but noncatalytic. The
radial velocity gradients are neglected. Find the steady state axial temperature
distribution. Thermal energy produced by chemical reaction is given by [16]
Sc = SC1 h (T-T0)
(T1-T0)i
6. Consider diffusion system such as the one in a Stefen diffusion tube evaporating
liquid A in to gas B. it may be assumed that liquid level in the tube is maintained
at z=z1. A stream of gas mixture A-B flows past slowly at the top of the tube z=z2.
The concentration of A is xA1 at z=z1 and xA2 at z=z2. The system is maintained
at constant temperature and pressure. Gases A and B are assumed to form ideal
mixture and the solubility of B in liquid A may be assumed negligible. Arrive at
the steady state concentration distribution relation using the shell balance method.
[16]
7. 31. Consider an isothermal incompressible Newtonian fluid is flowing radially be-
tween two vertical coaxial porous cylindrical shells. Assume steady laminar flow
show that the pressure distribution is
P - PR = 1
2?v2
r |r=R 1 - R
r 2
Use equation of motion to arrive at the result. Neglect end effects. [16]
8. Component A is reacting uniformly in a solid of arbitrary shape. The reaction is
second order. Obtain concentration of solid as a function of position and time if
initial concentration of solid everywhere is CA0. Assume no mass transfer across
the solid.
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