What have you learned?

Check the statements that accurately summarize the concepts discussed in this tutorial so far:

1. Laminar flow corresponds to Re > 2100.

2. Velocity profiles in laminar flow are parabolic. The fluid in the center of the pipe moves fastest, and fluid near the walls moves slowest. Fluid moves only down the axis of the pipe, i.e., the radial component of the fluid velocity is zero.

3.

4. Transitional flow happens when 2100 < Re < 4000, and is characterized by pressure drops which are difficult to reproduce experimentally.

5.

6. Turbulent flow occurs when Re > 4000.

7. Laminar flow occurs when Re > 2100.

8. Velocity profiles in transitional flow are difficult to characterize. Sometimes they appear laminar, sometimes turbulence appears.

9.

10. Flow in the turbulent regime will give a pressure drop proportional to tex2html_wrap_inline215.

11. Turbulent flow gives rise to chaotic velocity profiles. Fluid moves in every direction, i.e., non-zero radial velocities. Note that eddys, or vortices, are observed in turbulent flow.

12. For flow in the laminar flow regime gives pressure drops proportional to the flow-rate.

Repeat Reynolds experiment

  1. Specify the Reynolds number and observe the flow.
  2. Decide whether the flow is laminar, turbulent, or transitional.
  3. Graph the flow regime vs. the Reynolds number.

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