In a steady flow process a fluid flow steadily through a control volume. At any point, fluid properties remain constant during the process. There are many engineering equipments which function as steady flow system.
Closed or non-flow process: This type of processes happens in closed system. No mass transfer takes place but, energy transfer in the form of heat and work may occur across the boundary.
If a closed system completes one cycle the cyclic integral of heat is equal to the cyclic integral of work. If a system completes a process, the change in stored energy of the system is equal to the net heat interaction minus the net work interaction during the process.