Mass flow rate. Useful approximations to get simple algebraic forms for the natural laws. Across the INLETS AND OUTLETS of the CV: APPROX 1. Uniform property approximation: The variation of system properties (such as density, specific kinetic/potential/internal/total energy)
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Across the INLETS AND OUTLETS of the CV:
CAN BE NEGLECTED
Note: uniform property
approximation at inlets/outlets
is used here
+First Law of Thermodynamics for open systems
+Splitting work into flow and non-flow work
Flow work: work done at the inlets/outlets due to fluid
flowing in/out against pressure forces. At outlets, work
is done by the system on the surroundings. At inlets,
work is done by the surroundings on the system.
=Work other than flow work such as shaft work,
electric work, boundary displacement work.
First Law of Thermodynamics for open systems