This module covers momentum balances. It includes definition of velocities, frame of reference, and diffusion related to these velocities. Different types of flow (laminar and turbulent) and how to model them is discussed. 0-D, 1-D and 2-D momentum balances are derived and finite volume for momentum balances is discussed.

Module preview


  • What is momentum
  • Frames of reference
  • Definition of velocities and diffusion
  • Types of flow
  • Newton’s law
  • Friction in turbulent flow
  • Momentum balance 1-D
  • Incompressible flow – common mistake
  • Boundary conditions
  • Momentum balance 0-D
  • Finite volume
  • Momentum balance in 2-D

Learning outcomes

At the end of this module, students should be aware of the effects of different frames of reference, the basis for velocity used and its impact on the equations to be solved. They should be able to write down 0-D and 1-D momentum balances using finite volume. They should also be aware of a common mistake in dealing with compressible flows and should know what boundary conditions are needed in what case.

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