Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 8th Sem New 2180507 Transport Phenomena Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2180507 Date: 21/11/2019
Subject Name: Transport Phenomena
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain the Newton?s law of viscosity. 03
(b) Discuss the two and three parameter rheological models to study the behaviour
Non-Newtonian fluid.
04
(c) Make a differential momentum balance and obtain the expression for the
distributions of momentum flux and velocity for the flow of a fluid through a
circular tube.
07
Q.2 (a) Give the physical significance of the three kinds of time derivatives used in the
equation of change for momentum transport.
03
(b) State and explain Hagen-Poiseulle law with all assumptions. 04
(c) Derive the Navier-Stoke?s equation in cartesian coordinate. 07
OR
(c) Determine the velocity and shear stress distributions in a couettee viscometer
for the tangential laminar flow of an incompressible fluid flowing between two
coaxial cylinders, the outer one of which is rotating with an angular velocity ?0.
07
Q.3 (a) State and explain the general shell energy balance equation. 03
(b) Distinguish between free and forced convection heat transport phenomena. 04
(c) Derive the expression for the heat conduction with chemical heat source. 07
OR
Q.3 (a) Define thermal conductivity and thermal diffusivity. What are its units? 03
(b) State the significance of Prandtl and Nusselt number. 04
(c) With neat diagram develop a formula for the overall heat transfer coefficient for
the two concentric cylindrical pipe wall.
07
Q.4 (a) Why fins are used in heat transfer? Give three examples of convection heat
transport in chemical industry.
03
(b) Explain the various boundary conditions used to solve heat transport problems. 04
(c) Derive the expression for the heat conduction with a viscous heat source. 07
OR
Q.4 (a) State the shell mass balance equation and boundary conditions used for solving
the mass transport problems.
03
(b) Explain the molecular diffusion in gases with appropriate equations. 04
(c) Derive the relation for diffusion through a stagnant gas film. 07
Q.5 (a) Compare Fick?s law of diffusion with Fourier?s law of heat conduction. 03
(b) Using the equation of combination of kinetic theory and corresponding states
arguments estimate DAB for the system of CO-CO2 at 296.1 K and 1 atm total
pressure. The data is given as follows.
Species Tc (K) Pc (atm)
CO 133 34.5
CO2 304.2 72.9
The values for constants are a = 2.745 ? 10
-4
and b = 1.823
04
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2180507 Date: 21/11/2019
Subject Name: Transport Phenomena
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain the Newton?s law of viscosity. 03
(b) Discuss the two and three parameter rheological models to study the behaviour
Non-Newtonian fluid.
04
(c) Make a differential momentum balance and obtain the expression for the
distributions of momentum flux and velocity for the flow of a fluid through a
circular tube.
07
Q.2 (a) Give the physical significance of the three kinds of time derivatives used in the
equation of change for momentum transport.
03
(b) State and explain Hagen-Poiseulle law with all assumptions. 04
(c) Derive the Navier-Stoke?s equation in cartesian coordinate. 07
OR
(c) Determine the velocity and shear stress distributions in a couettee viscometer
for the tangential laminar flow of an incompressible fluid flowing between two
coaxial cylinders, the outer one of which is rotating with an angular velocity ?0.
07
Q.3 (a) State and explain the general shell energy balance equation. 03
(b) Distinguish between free and forced convection heat transport phenomena. 04
(c) Derive the expression for the heat conduction with chemical heat source. 07
OR
Q.3 (a) Define thermal conductivity and thermal diffusivity. What are its units? 03
(b) State the significance of Prandtl and Nusselt number. 04
(c) With neat diagram develop a formula for the overall heat transfer coefficient for
the two concentric cylindrical pipe wall.
07
Q.4 (a) Why fins are used in heat transfer? Give three examples of convection heat
transport in chemical industry.
03
(b) Explain the various boundary conditions used to solve heat transport problems. 04
(c) Derive the expression for the heat conduction with a viscous heat source. 07
OR
Q.4 (a) State the shell mass balance equation and boundary conditions used for solving
the mass transport problems.
03
(b) Explain the molecular diffusion in gases with appropriate equations. 04
(c) Derive the relation for diffusion through a stagnant gas film. 07
Q.5 (a) Compare Fick?s law of diffusion with Fourier?s law of heat conduction. 03
(b) Using the equation of combination of kinetic theory and corresponding states
arguments estimate DAB for the system of CO-CO2 at 296.1 K and 1 atm total
pressure. The data is given as follows.
Species Tc (K) Pc (atm)
CO 133 34.5
CO2 304.2 72.9
The values for constants are a = 2.745 ? 10
-4
and b = 1.823
04
2
(c) Derive an expression of molar flux for the diffusion with homogeneous
chemical reaction as A + B ? AB.
07
OR
Q.5 (a) Discuss the various methods to calculate the self diffusivity of the binary
mixture whose diffusivities are dependent on temperature and pressure.
03
(b) Using the equation of theory of diffusion in gases at low density predict the
value of DAB for the system of CO-CO2 at 296.1 K and 1 atm total pressure.
The data is given as follows.
Species ? (?) ?/k (K)
CO (A) 3.590 110
CO2 (B) 3.996 190
The collision integral for diffusion ?DAB = 1.067
04
(c) Derive an equation for the diffusion with heterogeneous chemical reaction. 07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020