In the world of fluid dynamics and process engineering, the ejector (or eductor) is a deceptively simple device. With no moving parts, it uses a high-pressure motive fluid to entrain, compress, or pump a secondary low-pressure fluid. From vacuum distillation in oil refineries to chemical dosing in water treatment, ejectors are indispensable.
For incompressible liquids: [ A_t = \fracW_motive\rho_1 \cdot \sqrt2 \cdot \Delta P_nozzle / \rho_1 ] ejector design calculation xls
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Once you have the required flow rates, size the physical dimensions: Motive Nozzle Throat ( cap A sub 1 Function of motive steam flow rate, pressure ( cap P sub p ), and temperature. Ejector Throat ( cap A sub 3 ejectors are indispensable.