ABSTRACT
This chapter introduces the continuity equation for steady flow through an open thermofluid system. It presents the momentum equation for steady flow. The chapter shows the steady flow energy equation and discusses its application to: boilers and condensers; turbines and compressors; nozzles. It also introduces Bernoulli's equation for ideal incompressible flow. The chapter analyses velocity-measuring devices using Bernoulli's equation. It describes that the open thermofluid systems operate with 'steady' flow. For steady flow across an open thermofluid system the mass flow rate of fluid entering the system must equal the mass flow rate leaving the system. Energy must be conserved, so any energy transfer across the boundary of an open thermofluid system must be equal to the change of energy between the outlet and inlet of the system. There is a wide range of steady flow devices used in mechanical engineering. Boilers, condensers, turbines, compressors and nozzles are but some of them.
