Work steady flowafter a device has gone through its startup process it could enter a steady flow process. There are few definitions that can be used to describe a steady flow process. First, a steady flow process has the fluid flowing through the CV steadily. Since the fluid is flowing steadily, the mass flow value through the device would be constant. Next a steady flow process has no intensive or extensive properties that would change with time. This would mean that the specific volume, internal energy, etc would remain constant, and for these values to remain constant that would mean that the energy going into the device must equal the energy coming out of the device, refer to equation 1.(1)(2)Finally, for a device to have a steady flow process the boundary work has to be zero. This doesn't mean that there can be other aspects that could require work, or produce work. For example a certain amount of work is required to turn the blades of a turbine, which is known as shaft work.Work non flowConsidering a piston cylinder arrangement and process is quasistaticfor a instant piston travel a distance of 'x' with no change in pressure(quasistatic process)hence the work done for the instant isW=F*D F=force and D=distance travelled by pistonW=(P*A)*D p=pressure and A=area of pistonW=P*A*x x=distance travelled by pistonA*x = volume swept by piston=dVwe can write this work asdW=PdV where P is pressure inside cylinder and dV is volume swept pistonFlow process: It is one in which fluid enters the system and leaves it after work interaction, which means that such processes occur in the systems having open boundary permitting mass interaction across the system boundary. While, Non flow process: It is the one in which there is no mass interaction across the system boundaries during the occurrence of process.