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