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. (A)</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 (A)</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 (B)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>Diameter of the tube (D)</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 (A)</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 (A)</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. (D)</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. (D)</p> Signup and view all the answers

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

<p>Average velocity (D)</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. (B)</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. (A)</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 (C)</p> Signup and view all the answers

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