JNTU
JNTU B.Tech II INTRODUCTION TO TRANSPORT PHENOMENON Previous Question Paper (October - 2020 - R18)
Answer any five questions. All questions carry equal marks.
Main
Write about the following:
kinematic viscosity
Answer
Kinematic viscosity, denoted by the Greek letter ν (nu), is defined as the ratio of dynamic viscosity (μ) to the density (ρ) of a fluid. It represents the momentum diffusivity of a fluid, indicating how easily a fluid flows under the influence of gravity or other forces.
The SI unit for kinematic viscosity is square meters per second (m²/s), and it is a measure of the resistance to flow of a fluid under gravity.
Newtonian fluids
Answer
Newtonian fluids are fluids that obey Newton's law of viscosity, which states that the shear stress is directly proportional to the velocity gradient (rate of shear strain) perpendicular to the direction of flow. The constant of proportionality is the dynamic viscosity (μ).
For these fluids, the viscosity remains constant regardless of the rate of shear applied at a constant temperature and pressure. Common examples include water, air, and most simple gases and liquids.
continuity equation
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What is Navier-Stoke’s equation? Explain the importance of Navier-Stoke’s equation in fluid flow?
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Compute the steady state momentum flux, when the lower plate velocity is 1 ft/sec in the positive x direction, the plate separation is 0.001 ft, and the fluid viscosity is 0.7 cp.
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Derive the equation for flow through porous media.
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Derive the equations for steady state heat conduction in a sphere?
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A hollow sphere has an inside surface temperature 300C and outside surface temperature of 30C. Calculate the heat loss by conduction for an inside diameter of 5 cm and outside diameter of 15 cm. The thermal conductivity of material is 15 kcal/hr m 0C.
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Discuss about diffusion and convective mass transfer. Give examples.
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Derive the equation for unsteady state diffusion in finite and infinite slab.
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