Fluent 17.2 software was applied for numerical solving of the equations. The latter three values are calculated using the pressure ratio equation or flow ratio equation shown in the jet pump properties window and the eductor characteristic plot in Figure 3. of designing multistage ejectors for generating the required high-output vacuum. Of course, volumetric flow can be used here if the fluids are the same. Max Flow Ratio: the maximum ratio of suction mass flow divided by supply mass flow. The discharge pressure to use is the highest pressure on the vertical line. In some eductor characteristic curves, the line becomes vertical at high flow ratios. Pressure Ratio at Max Flow Ratio: the pressure ratio at the maximum flow ratio. This is similar to how a conventional pump curve defines the pressure at zero flow where the pump curve intersects the y-axis. Pressure Ratio at Zero Flow: the pressure ratio when the discharge has zero flow. Again, there is no pipe on the workspace to deliver this fluid, it is modeled internally in the junction. Supply Flow Rate: either the volumetric flow rate or mass flow rate of the supply (motive) fluid. This value can be specified in terms of head (HGL) or pressure. ![]() The supply pressure is specified explicitly in this window and modeled internally in the junction type. Note that on the workspace, there is no pipe delivering this fluid into the jet pump. Supply Pressure: the pressure of the supply fluid (also referred to as the motive fluid). Inlet Elevation: the elevation of the jet pump relative to the reference elevation.
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