Viscosity

IMPORTANT

Viscosity: Overview

This topic covers concepts such as Viscosity of Fluids, Viscous Force, Factors Affecting Viscous Force, Contact-Area of the layers, Velocity Gradient between Layers, Coefficient of Viscosity, SI Unit of Coefficient of Viscosity, Poise, etc.

Important Questions on Viscosity

MEDIUM
IMPORTANT

A spherical ball of radius 1×10-4 m and density 104 kg m-3 falls freely under gravity through a distance h before entering a tank of water. If after entering the water the velocity of the ball does not change, find h. The viscosity of water is 9.8×10-6 Nsm-2.

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 Turbulent flow tends to occur at higher velocities, low viscosity.

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What is the difference between viscosity and coefficient of viscosity?

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What are the conditions required for turbulent flow?

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What is the assumption of the Poiseuille equation for the flow of liquid through a capillary tube?

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What is the unit of coefficient?

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Which among the following methods are not standard laboratory viscometers?

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What happens to the coefficient of viscosity if the temperature increases?

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What is poiseuille's Theorem?

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What is Poiseuille's formula deduce it by means of dimensions?

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The  hydraulic radius Rh is the ratio of the area of the tube to its volume 

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Water flows between two plates of which the upper one is stationary and the lower one is moving with a velocity V. What fluid in contact with the upper plate?

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How do you calculate rain drop velocity?

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Poise is the unit of

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Critical velocity is the velocity below which the flow of liquid is _____?

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The critical velocity depends on the radius of the earth, mass of the earth and gravitational constant.

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Define critical velocity?

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In laminar flow, is reynold's number occurs below the critical value?

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Motion of particles of the fluid is very orderly in _____.

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The fluid that doesn't follow Newton's law of viscosity is called as_____.