Lecture 6: Viscosity and Surface Tension in Fluids

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What is the defining property of fluids?

Inability to flow

High viscosity

Ability to take on the shape of the container (correct)

Low compressibility

What is the term for the flow of a fluid assumed to have no viscosity?

Laminar flow

Steady-state flow

Turbulent flow

Inviscid flow (correct)

What is the defining characteristic of laminar flow?

High level of shear stress

Eddies and swirls mixing layers of fluid

Smooth and continuous streamlines (correct)

Frictionless fluid

What is the product SV in the steady-state case for incompressible and inviscid flow?

Volume flow rate Signup and view all the answers

How is turbulent flow characterized?

Eddies and swirls that mix layers of fluid together Signup and view all the answers

What factor does the force F required to keep the top plate moving at a constant velocity v depend on?

Area A of the plate Signup and view all the answers

What causes the viscosity of gases to increase with temperature?

Increased molecular energy Signup and view all the answers

What does the resistance R include in the equation for flow rate?

Everything except pressure that affects flow rate Signup and view all the answers

What relationship exists between flow rate Q and pressure differential?

Flow rate is directly proportional to pressure differential Signup and view all the answers

What does Poiseuille’s law describe for laminar flow of an incompressible fluid?

Relationship between fluid viscosity and tube radius Signup and view all the answers

In the context of fluids, what is the defining characteristic of an ideal fluid?

Frictionless flow Signup and view all the answers

What is the defining characteristic of laminar flow in fluids?

Smooth and continuous streamlines Signup and view all the answers

What is the term for the condition where the fluid properties at any single point in the system do not change over time?

Steady-state flow Signup and view all the answers

What is the product SV in the steady-state case for incompressible and inviscid flow?

Volume flow rate Signup and view all the answers

How is turbulent flow characterized in fluids?

Irregular flow behavior Signup and view all the answers

What factor determines the resistance to flow in a liquid according to the given text?

Viscosity Signup and view all the answers

How does the force F required to keep the top plate moving at a constant velocity v depend on the area A of the plate?

Directly proportional to A Signup and view all the answers

What causes the viscosity of liquids to decrease and the viscosity of gases to increase with temperature?

Decrease in molecular energy for liquids and increase in molecular energy for gases Signup and view all the answers

What relationship exists between flow rate Q and the pressure differential according to the given text?

Flow rate is directly proportional to pressure differential Signup and view all the answers

What does Poiseuille’s law describe for laminar flow of an incompressible fluid through a horizontal tube of uniform radius and length?

Resistance to laminar flow Signup and view all the answers

Lecture 6: Viscosity and Surface Tension in Fluids

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Questions and Answers

What is the defining property of fluids?

What is the term for the flow of a fluid assumed to have no viscosity?

What is the defining characteristic of laminar flow?

What is the product SV in the steady-state case for incompressible and inviscid flow?

How is turbulent flow characterized?

What factor does the force F required to keep the top plate moving at a constant velocity v depend on?

What causes the viscosity of gases to increase with temperature?

What does the resistance R include in the equation for flow rate?

What relationship exists between flow rate Q and pressure differential?

What does Poiseuille’s law describe for laminar flow of an incompressible fluid?

In the context of fluids, what is the defining characteristic of an ideal fluid?

What is the defining characteristic of laminar flow in fluids?

What is the term for the condition where the fluid properties at any single point in the system do not change over time?

What is the product SV in the steady-state case for incompressible and inviscid flow?

How is turbulent flow characterized in fluids?

What factor determines the resistance to flow in a liquid according to the given text?

How does the force F required to keep the top plate moving at a constant velocity v depend on the area A of the plate?

What causes the viscosity of liquids to decrease and the viscosity of gases to increase with temperature?

What relationship exists between flow rate Q and the pressure differential according to the given text?

What does Poiseuille’s law describe for laminar flow of an incompressible fluid through a horizontal tube of uniform radius and length?

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