Properties of Fluids Lecture 2 Quiz
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Questions and Answers

What is viscosity?

Viscosity is the resistance that a fluid offers to flow when subject to a shear stress.

Who described viscosity as the resistance which arises from the lack of slipperiness of the parts of a fluid?

Isaac Newton

How does viscosity of a fluid change with temperature in liquids?

In liquids, viscosity decreases with increasing temperature.

How does viscosity of a fluid change with temperature in gases?

<p>In gases, viscosity increases with increasing temperature.</p> Signup and view all the answers

What is the bulk modulus of elasticity?

<p>It is a measure of a substance's resistance to compression under pressure.</p> Signup and view all the answers

What is surface tension?

<p>It is the tendency of the surface of a liquid to resist an external force.</p> Signup and view all the answers

What is viscosity?

<p>Viscosity is the resistance of a fluid to flow.</p> Signup and view all the answers

How is viscosity related to the deformation of fluids?

<p>Fluids with high viscosity deform more slowly than fluids with low viscosity.</p> Signup and view all the answers

What is the unit of viscosity?

<p>The unit of viscosity is N.s/m2 or kg/m/s.</p> Signup and view all the answers

What is the significance of viscosity in pipeline transportation?

<p>Viscosity is important in determining the amount of fluids that can be transported in a pipeline during a specific period of time.</p> Signup and view all the answers

What is the 'no slip condition' in relation to viscosity?

<p>The 'no slip condition' refers to the fact that, due to viscosity, particles of fluid adhere to the walls at boundaries, resulting in zero fluid velocity relative to the wall.</p> Signup and view all the answers

What is the Newtonian law of viscosity?

<p>The Newtonian law of viscosity states that there is a linear relationship between shear stress and the velocity gradient (rate of shear) in Newtonian fluids.</p> Signup and view all the answers

How is non-Newtonian fluid viscosity different from Newtonian fluid viscosity?

<p>The viscosity of non-Newtonian fluids depends on the velocity gradient as well as the condition of the fluid, while the viscosity of Newtonian fluids is not dependent on the velocity gradient.</p> Signup and view all the answers

What is kinematic viscosity?

<p>Kinematic viscosity is the ratio of the viscosity to the density of a fluid.</p> Signup and view all the answers

What is the bulk modulus of elasticity?

<p>The bulk modulus of elasticity measures a substance's resistance to uniform compression and is defined as the ratio of the infinitesimal pressure increase to the resulting relative decrease of the volume.</p> Signup and view all the answers

How does the viscosity of liquids change with temperature?

<p>In general, the viscosity of liquids increases with temperature.</p> Signup and view all the answers

Flashcards

What is viscosity?

Viscosity is a fluid's resistance to flowing, like honey being thicker and slower to move than water.

Who defined viscosity as 'lack of slipperiness'?

Isaac Newton described viscosity as the lack of slipperiness between fluid particles.

How does temperature affect liquid viscosity?

The viscosity of liquids decreases with increasing temperature. Imagine hot honey flowing more easily than cold honey.

How does temperature affect gas viscosity?

The viscosity of gases, unlike liquids, increases with increasing temperature. Hot air is thicker and more resistant to flow.

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What is the bulk modulus?

The bulk modulus measures how much a substance resists compression. High bulk modulus means it's hard to compress, like a steel rod.

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What is surface tension?

Surface tension is the force that makes a liquid's surface act like a stretched film. It allows insects to walk on water.

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What is viscosity?

Viscosity is the resistance of a fluid to flow. High viscosity means it flows slowly (like honey), low viscosity means it flows easily (like water).

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How does viscosity affect fluid deformation?

Viscosity affects how easily fluids deform. High viscosity fluids deform slowly, while low viscosity fluids deform quickly.

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What is the unit of viscosity?

The unit of viscosity is the Pascal-second (Pa·s) or the kg/m/s.

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Why is viscosity important in pipelines?

Viscosity is important in pipeline transportation because it affects the flow rate of fluids. High viscosity fluids require more pressure for transport.

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What is the 'no slip condition'?

The 'no slip condition' means that fluid particles stick to the wall of a pipe, causing fluid velocity to be zero at the wall. This is due to viscosity.

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What is Newton's law of viscosity?

Newton's law of viscosity says that for Newtonian fluids, shear stress is directly proportional to the rate of change in velocity. Higher velocity change means more resistance.

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How is non-Newtonian viscosity different?

Non-Newtonian fluids have viscosity that depends on various factors like shear rate and temperature. Their viscosity isn't a simple constant.

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What is kinematic viscosity?

Kinematic viscosity is the ratio of dynamic viscosity (resistance to flow) to the fluid's density. This accounts for the fluid's mass.

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What is the bulk modulus of elasticity?

The bulk modulus measures how much a substance resists compression. Think of a sponge that resists squeezing.

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How does temperature affect liquid viscosity?

Liquids generally become more viscous as temperature increases. Think of how hot honey flows easier than cold honey.

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