LearnChemE

Interactive Self-Study Module: Entrance Length in Pipe Flow

Overview:

This module uses a screencast to explain the concepts of entrance length and boundary layers. It then provides an example problem to allow the users to test themselves. Your retention of material in this module will increase if you write down reasons for your answers to ConcepTests and you try to solve the example problem before watching the screencast solution. We suggest using the learning resources in the following order:

  1. Attempt to answer the multiple-choice ConcepTest and solve the example problem before watching the screencast.
  2. Watch the screencast that provides an introduction to entrance length.
  3. Review important equations for entrance length in pipe flow.
  4. Try to solve the example problem before watching the solution in the screencast.
  5. Answer the ConcepTests.
  6. Look at the list of key points, but only after you try to list the key points yourself.
Motivation:
  • ¬†Entrance length concepts are used to determine where fully-developed flow begins in a pipe.
  • This module is intended for fluid mechanics courses.
Before studying this module, you should be able to:
  • Change a volumetric flow rate into a velocity.
  • Explain the concept of Reynold’s number (Re) and be able to calculate it.
  • Explain the difference between laminar and turbulent flow.
After studying this module, you should be able to:
  • Determine if flow in a pipe is laminar or turbulent.
  • Calculate the entrance length for both laminar and turbulent flow.
  • Determine where a flow becomes fully-developed.