18.3 : 이동하고 변형되지 않는 제어 볼륨의 질량 보존

The conservation of mass is crucial in understanding the water flow in a rotating sprinkler system used for agricultural irrigation.

The sprinkler receives water from a stationary source and ejects it through rotating nozzles to irrigate the field.

The control volume includes the water inside the sprinkler head and nozzles, with the boundaries defined by the nozzle openings and the water source inlet.

Water flows steadily through the system as the sprinkler rotates, maintaining a continuous irrigation pattern.

The water's relative velocity is determined by its speed as it exits the nozzle compared to the motion of the rotating sprinkler head.

The difference between the water's absolute velocity and the rotating sprinkler's velocity determines how fast the water is ejected relative to the moving nozzle.

For steady flow, the inflow of water from the source and the outflow through the nozzles must be balanced.

The nozzle size and rotation speed are designed to ensure uniform water distribution across the field and maximize irrigation efficiency.