Fluid Dynamics: Engine Oil vs. Water
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Questions and Answers

Why does engine oil require a larger pump compared to water to move at a specified velocity in a given tube?

  • Engine oil has higher viscosity than water. (correct)
  • Engine oil is more compressible than water.
  • Engine oil has a lower resistance to flow than water.
  • Engine oil is denser than water.

    • What does the average velocity in fluid flow represent?

  • Average pressure of the fluid
  • Density of the fluid
  • Temperature of the fluid
  • Speed of the fluid particles moving in a tube (correct)

    • Why is the mean temperature significant for thermodynamics analysis and heat transfer calculations?

  • It affects flow characteristics like friction losses and heat transfer. (correct)
  • It changes the fluid's viscosity.
  • It controls the fluid's smell.
  • It determines the color of the fluid.

    • How does the viscosity of a fluid affect the energy required to pump it at a specified velocity?

    <p>Higher viscosity requires more energy due to lower resistance.</p> Signup and view all the answers

    What does a pump need to provide in order to overcome a fluid's resistance to flow and pump it at a specified velocity?

    <p>Pressure</p> Signup and view all the answers

    What is the defining characteristic that determines when fluid flow becomes turbulent?

    <p>Reynolds number exceeding 2000 to 4000</p> Signup and view all the answers

    What parameter is used to characterize the efficiency of fluid flow through a channel or conduit?

    <p>Hydraulic diameter</p> Signup and view all the answers

    Why do inviscid fluids not develop a velocity boundary layer in pipes?

    <p>Lack of resistance between flow layers</p> Signup and view all the answers

    In a circular tube, what is the hydraulic diameter equal to?

    <p>Diameter of the tube</p> Signup and view all the answers

    What prevents the velocity profile from changing in the fully developed region of flow in a circular tube?

    <p>Constant wall temperature</p> Signup and view all the answers

    What influences the temperature profile in a fully developed flow in a circular tube?

    <p>Heat transfer mechanisms and boundary conditions</p> Signup and view all the answers

    How does the viscosity of engine oil compare to water at room temperature?

    <p>Engine oil has higher viscosity than water.</p> Signup and view all the answers

    What is the significance of the Reynolds number in analyzing flow through circular tubes?

    <p>It determines whether the flow is laminar or turbulent.</p> Signup and view all the answers

    Which parameter is essential for understanding friction losses in fluid flow?

    <p>Average velocity</p> Signup and view all the answers

    In the context of fluid flow through circular tubes, why is a constant diameter important?

    <p>It simplifies calculations and analysis of flow behavior.</p> Signup and view all the answers

    Why does engine oil require more energy than water to be pumped at a specified velocity?

    <p>Engine oil has higher viscosity, requiring more energy to overcome resistance.</p> Signup and view all the answers

    Which parameter is crucial for heat transfer calculations and energy balance in a fluid system?

    <p>Mean temperature</p> Signup and view all the answers

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