A steady flow process is a process in which matter and energy flow in and out of an open system at steady rates. Moreover , an open system undergoing a steady flow process does not experience any change in the mass and energy of the system.A steady state flow process requires conditions at all points in an apparatus remain constant as time changes. There must be no accumulation of mass or energy over the time period of interest. The same mass flow rate will remain constant in the flow path through each element of the system.