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The energy balance term that is most often forgotten in a flow problem is

  • A.the internal energy carried along by the flowing fluid
  • B.the flow work carried by the entering and leaving streams
  • C.the heat that is added to the system across its boundary
  • D.the shaft work that is delivered by the machine itself

Answer: B

Flow work is invisible in a closed system and appears only when mass crosses a boundary, so it is the term newcomers omit. Using enthalpy instead of internal energy builds it in automatically. That is precisely why enthalpy was defined in the first place.

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