1. A diffuser is an adiabatic device that decreases the kinetic energy of the fluid by slowing it down. What happens to this lost kinetic energy?
2. The kinetic energy of a fluid increases as it is accelerated in an adiabatic nozzle. Where does this energy come from?
3. Is heat transfer to or from the fluid desirable as it flows through a nozzle? How will heat transfer affect the fluid velocity at the nozzle exit?