Are you looking for a comparison or technical/conceptual difference between control mass system and control volume system? then you are at the right article. This can be also interpreted as the difference between an open system and closed system in classical thermodynamics.
As we all know a system in classical thermodynamics can be classified into a control mass system, control volume system and isolated system. The comparison between control mass system and control volume system are as follows.
Control Mass System (Closed System)
- There should not be any mass interaction. However, there can be energy interactions. Control mass system interacts with the surroundings in the form of work and heat.
- Mass inside the system is constant as well as its identity is fixed. For example, from a system containing water of 100 kg, 10 kg of water is taken out and is replaced with 10 kg of oil. Here even though initial and final mass is the same (constant), that is 100 kg but the identity of mass is changed, it is like 90kg of water and 10 kg of oil instead of 100 kg water. So this cannot be treated as a control mass system.
- In control mass system, the volume of the system may change.
- Example of a closed system or control mass system is piston-cylinder arrangement without a valve.
Control Volume System (Open System)
- In this type of system, there are both mass and energy interactions between system and surroundings. Control volume system interacts with the surroundings in the form of work, heat as well as mass.
- Here identity of mass may not be fixed.
- In an open system, the volume of the system is fixed and is known as control volume.
- The boundary of the control volume is known as the control surface.
Interesting concept: In steady state, control volume system will look similar to control mass system but will differ in terms of identity. That is, in steady state, mass into the control volume = mass out of control volume and for control mass system, mass is always constant. But in both cases, the identity of mass is different.
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