Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) BT-Bio Technology 2020 December 3rd Sem 76949 Transport Phenomenon Previous Question Paper
Total No. of Pages : 03
Total No. of Questions : 18
B.Tech. (BT) (2018 Batch) (Sem.?3)
TRANSPORT PHENOMENON
Subject Code : BTBT-305-18
M.Code : 76949
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
4 .
Use of s te am tab le is allow ed.
SECTION-A
Write briefly :
1.
Define Newton's law of viscosity.
2.
Define average velocity. And how do you calculate average velocity?
3.
What is power law model?
4.
Define Reynold's number and Prandtl number.
5.
What is Chilton Colburn analogy?
6.
Define Navier Stokes equation.
7.
What is Biot number for mass transfer? What do we conclude from Biot number is very
small (<<1)?
8.
Relation between maximum velocity and local velocity, when a fluid flows under laminar,
steady state, incompressible Newtonian fluid, in a tube?
9.
What are Bingham plastic fluids and pseudo plastic fluids? Explain with example.
10. What is Hagen Poiseullie's equation?
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SECTION-B
11. An exothermic chemical reaction takes place in a 20 cm thick slab and the energy
generation rate per unit volume is 1 ? 106 W/ m3 The steady-state heat transfer rate into the
slab at the left-hand side, i.e., at x = 0, is 280 W. Calculate the heat transfer rate to the
surroundings from the right-hand side of the slab, i.e., at x = L. The surface area of each
face is 40cm2. Also calculate the heat flux at x = 0 and x = L.
12. Water at 20 ?C is flowing past a flat plate at 0.914 m s. The plate is 0.305 m wide.
a) Calculate the Reynolds number 0.305 m from the leading edge to determine if the flow
is laminar.
b) Calculate the boundary layer thickness at x = 0.152 and x = 0.305 m from the leading
edge.
13. Heat is generated in a rectangular heating element of dimensions 1m ? 0.5m ? 0.1m of
thermal conductivity 60 W/m K at rate of 15 ? 103 W/m3. Calculate maximum temperature
in the wall if the surface temperatures are 100?C. Also calculate the heat flux at the surface.
14. The potential function for a two dimensional, irrotational. incompressible flow field is
given as = x2-2y-y2. Find the stream function and velocity components vx and vy.
15. Consider a solid cone of circular cross-section whose lateral surface is well insulated as
shown in Figure 1. The diameters at x = 0 and x = L are 25cm and 5cm. respectively If the
heat flux at x = 0 is 45W/m2 under steady conditions, determine the heat transfer rate and
the value of the heat flux at x = L.
L
To
TL
D( )
x
x
FIG.1
SECTION-C
16. A 10 cm long copper fin of diameter 6mm is attached to a vertical wall at 500 K and is
projected in a room where air is at 300 K. The heat transfer coefficient at the fin surface is
300 W/m2 K and conductivity of fin material is 390 W/m K. Calculate :
a) Heat loss from fin.
b) Fin efficiency
c) Fin effectiveness.
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17. Heat is flowing through an annular wall of inside radius r0 and outside radius r1. The
thermal conductivity varies linearly with temperature from k0 at T0 to k1 at T1. Develop an
expression for the heat flow through the wall.
C
T0
T1
r0
r1
FIG.2
18. Consider the transfer of species A by diffusion through a slightly tapered slab as shown in
Figure. Mass transport can be considered one-dimensional in the z-direction.
Determine the rate of molar transfer for the :
a) Constant diffusivity
b) Constant diffusivity and constant area
Z = 0
X
A = XAO
Z = L
X
A = XAL
FIG.3
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021