Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 8th Sem 2180507 Transport Phenomena Previous Question Paper
Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VIII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2180507 Date:19/01/2021
Subject Name:Transport Phenomena
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Why the momentum, heat and mass transport phenomena should be studied 03
together?
(b) Briefly explain the physical significance of the three kinds of time derivatives 04
used in the equation of change for momentum transport.
(c) A viscous fluid is in laminar flow in a slit formed by two parallel walls at a 07
distance 2B apart. Make a differential momentum balance and obtain the
expression for the distributions of momentum flux and velocity.
Q.2 (a) State the Hagen-Poiseuille law with all the necessary assumptions.
03
(b) Discuss the three parameter rheological models for Non-Newtonian fluid.
04
(c) With neat diagram derive the expression of equation of continuity in rectangular 07
coordinate for the incompressible fluid.
Q.3 (a) State any three industrial examples of convection heat transport phenomena.
03
(b) With suitable examples discuss the difference between free and forced convection 04
heat transport phenomena.
(c) Derive the expression for heat conduction with chemical heat source in a fixed- 07
bed flow reactor.
Q.4 (a) Explain the Fourier's law of heat conduction.
03
(b) Discuss the different types of boundary conditions needed to solve heat transport 04
problems.
(c) With neat sketch derive the equations of temperature distributions for the heat 07
conduction with chemical heat source.
Q.5 (a) Define thermal conductivity and thermal diffusivity with its unit.
03
(b) State the equation of Prandtl and Nusselt number with their significance.
04
(c) Derive the expression for the heat conduction with a viscous heat source.
07
Q.6 (a) State the dimensionless groups to express relation between mass diffusivity, 03
thermal diffusivity and momentum diffusivity along with their significance.
(b) Explain Fick's law of binary diffusion along with its supportive equations.
04
(c) With neat diagram derive an expression of molar flux for the diffusion with 07
homogeneous chemical reaction.
1
Q.7 (a) Briefly discuss the theory of diffusion in gases at low density.
03
(b) Explain the boundary conditions for solving the mass transport problems.
04
(c) Write a note on diffusion of gases in porous media.
07
Q.8 (a) State any two methods of prediction of the diffusivity for binary system.
03
(b) Explain the molecular diffusion in gases with appropriate equations.
04
(c) Derive the expression of flux for the diffusion of A through non diffusing B.
07
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This post was last modified on 04 March 2021