Machine-translated by Google. Questions are authored in English.
Top

Discussion

Enthalpy rather than internal energy is the natural variable for flow processes because

  • A.it stays entirely constant across every steady flow device there is
  • B.it has no dependence of any kind whatever on the pressure of the stream
  • C.it already contains the flow work needed to push fluid across the boundary
  • D.it is a great deal easier to measure than the internal energy is

Answer: C

Pushing a unit of fluid into the control volume requires work equal to pressure times volume, and grouping that term with internal energy defines enthalpy. The steady flow equation is therefore written in enthalpy rather than in internal energy.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.