Where does water flow create a vacuum in an eductor?

In the context of an eductor, water flow creates a vacuum in the suction piping due to the principle of jet propulsion. As water moves rapidly through the eductor’s nozzle, it creates a low-pressure area in the suction piping. This difference in pressure causes fluid from the suction side, which is typically at a higher pressure, to be drawn into the nozzle along with the flow of water.

The vacuum is essential for the operation of the eductor as it allows for the mixing or transportation of another fluid, often a gas or liquid, into the system without the need for additional mechanical pumps. This process relies on the momentum imparted to the driving fluid, which is water in this case, as it accelerates through the nozzle and expands downstream, creating a vacuum that facilitates the suction action.

The other options, such as pressure tank, storage compartment, and drainage system, do not typically involve the creation of a vacuum through the flow dynamics of an eductor. These options refer to different functions or components associated with fluid handling and storage, rather than the mechanism through which an eductor operates.