Lecture 6: Viscosity and Surface Tension in Fluids
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Questions and Answers

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?

    <p>Volume flow rate</p> Signup and view all the answers

    How is turbulent flow characterized?

    <p>Eddies and swirls that mix layers of fluid together</p> 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?

    <p>Area A of the plate</p> Signup and view all the answers

    What causes the viscosity of gases to increase with temperature?

    <p>Increased molecular energy</p> Signup and view all the answers

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

    <p>Everything except pressure that affects flow rate</p> Signup and view all the answers

    What relationship exists between flow rate Q and pressure differential?

    <p>Flow rate is directly proportional to pressure differential</p> Signup and view all the answers

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

    <p>Relationship between fluid viscosity and tube radius</p> Signup and view all the answers

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

    <p>Frictionless flow</p> Signup and view all the answers

    What is the defining characteristic of laminar flow in fluids?

    <p>Smooth and continuous streamlines</p> 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?

    <p>Steady-state flow</p> Signup and view all the answers

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

    <p>Volume flow rate</p> Signup and view all the answers

    How is turbulent flow characterized in fluids?

    <p>Irregular flow behavior</p> Signup and view all the answers

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

    <p>Viscosity</p> 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?

    <p>Directly proportional to A</p> Signup and view all the answers

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

    <p>Decrease in molecular energy for liquids and increase in molecular energy for gases</p> Signup and view all the answers

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

    <p>Flow rate is directly proportional to pressure differential</p> 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?

    <p>Resistance to laminar flow</p> Signup and view all the answers

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