This document discusses several steady-flow engineering devices from a thermodynamic perspective. It describes nozzles, diffusers, turbines, compressors, throttling valves, mixing chambers, and heat exchangers. Nozzles and diffusers increase or decrease fluid velocity and pressure. Turbines produce power from fluid work, while compressors require power input. Throttling valves cause large pressure and temperature drops. Mixing chambers alter fluid temperature based on mass flow rates. Heat exchangers transfer heat between fluids without fluid mixing. Thermodynamic analysis of these devices involves considerations of heat, work, and energy transfers.