Design Calculation Xls — Ejector

Whether you are designing a vacuum ejector for a petroleum column or an eductor for a chemical reactor, master the spreadsheet. Understand every cell. Validate against real data. Then, and only then, will you truly understand the elegant physics of the motionless pump.

Ejectors operate on : high-pressure "motive" fluid is accelerated through a nozzle to create a low-pressure zone that sucks in a "secondary" fluid. The two streams mix and then enter a diffuser, where velocity is converted back into pressure. Key design variables for your spreadsheet include: Motive Pressure ( Ppcap P sub p ): The high-pressure fluid driving the system. Suction Pressure ( Pecap P sub e ): The pressure of the entrained vapor or gas. Discharge Pressure ( Pccap P sub c ejector design calculation xls

$$P_discharge = P_throat + \eta_d \cdot \frac12 \rho_m (V_2^2)$$ Whether you are designing a vacuum ejector for

Design a single-stage steam ejector to pull 100 kg/h of air from a vessel at 0.2 bar_abs, discharge to 1.0 bar_abs. Motive steam at 5 bar_g, 150°C. Then, and only then, will you truly understand