Reg No.:

00000CH4011219)Rme:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Course Code:CH401
Course Name: TRANSPORT PHENOMENA IN PROCESSES

Max. Marks: 100 Duration: 3 Hours
Use of Photostat copies of the complex equations of the following duly attested by the concerned faculty of
the institution shall be permitted in the University examination hall.

1. Tables containing Equation of continuity and equation of motion in rectangular, cylindrical and

1௮

2.

ತೆ.

a)

b)

a)
b)

a)

b)

spherical coordinate.
Tables containing Equations of the components of the stress tensor for Newtonian fluids in
rectangular, cylindrical and spherical coordinate.
Tables containing Equation of energy in terms of momentum fluxes and transport properties in
rectangular, cylindrical and spherical coordinate.
PART A Marks
Answer any two full questions, each carries 20 marks

Compute the mean molecular velocity of एद cm/s) and the mean free path A (in (5)
em) for oxygen at latm and 273.2K.A reasonable value for d is 3A°.What is the

ratio of the mean free path to the molecular diameter under these conditions?

Two immiscible incompressible fluids are flowing in the “മ്‌ direction in a (15)
horizontal thin slit of length L and width W under the influence of pressure
gradient. Derive the expressions for shear stress and velocity distribution.

Using the equation of continuity, show that Vv = 0. (5)

Derive the equation of motion in rectangular co-ordinate system and also deduce (15)
the expression to Euler’s equation for a constant density and viscous system.

By setting up a shell momentum balance, derive the expressions for velocity (13)
profile, maximum velocity, average velocity and volumetric flow rate for the

flow of an incompressible Newtonian fluid flowing down as a film over an
inclined rectangular plane of length “1.” and width ‘W. The surface of the plane

is inclined at an angle "0 with the vertical and “6? is the thickness of the film.

Explain with a neat figure, the velocity distribution for turbulent flow in tubes. (7)

PART B
Answer any two full questions, each carries 15 marks.
Consider a spherical form of nuclear fissionable material of radius സ്‌ and 15 (15)
surrounded by aluminium cladding of radius ۶ .The purpose of cladding is to
absorb neutrons. Inside the fuel element, due to fission thermal energy is
produced (S,).This source will not be uniform throughout the sphere of
fissionable material, it will be smallest at the centre of the sphere. Therefore
source is assumed as a parabolic function. Sn = Sno [1+b(1/ ए? )2] where Sno is
the volume rate of production at the centre of the sphere, b-dimensionless

Page lof2