Ejector Design Calculation Xls Jun 2026

Use the law of conservation of momentum within the mixing chamber to find the velocity of the mixed stream:

Add a Monte Carlo simulation using =NORM.INV(RAND(), mean, stdev) on input parameters (e.g., pressure transmitters have ±1% error). Calculate the 90% confidence interval for actual ṁ_s.

An ejector uses a high-pressure motive fluid to entrain and compress a low-pressure suction fluid. The process relies entirely on the conversion of pressure energy into kinetic energy, and back into pressure energy, without any moving parts. Key Components ejector design calculation xls

A professional Excel sheet for ejector sizing should be structured logically across dedicated tabs or sequential blocks.

rc=(2γ+1)γγ−1r sub c equals open paren the fraction with numerator 2 and denominator gamma plus 1 end-fraction close paren raised to the the fraction with numerator gamma and denominator gamma minus 1 end-fraction power Step 3: Nozzle Geometry Calculation Rearrange the choked flow equation to solve for area. Nozzle Throat Diameter ( Dtncap D sub t n end-sub ): Use the law of conservation of momentum within

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.

Ve=2⋅1000⋅(hinlet−hisentropic,exit)cap V sub e equals the square root of 2 center dot 1000 center dot open paren h sub i n l e t end-sub minus h sub i s e n t r o p i c comma e x i t end-sub close paren end-root Step 3.3: Mixing Chamber Calculations The process relies entirely on the conversion of

For 95% of industrial sizing (steam jets, air ejectors, single-phase gas), an XLS is sufficient for preliminary and even detailed design.

| Parameter | Symbol | Unit | |-----------|--------|------| | Motive fluid pressure (inlet) | P₁ | bar, psi | | Suction fluid pressure | P₂ | bar, psi | | Discharge (back) pressure | P₃ | bar, psi | | Motive fluid flow rate | W₁ | kg/h, lb/h | | Suction fluid flow rate | W₂ | kg/h, lb/h | | Motive fluid density | ρ₁ | kg/m³ | | Suction fluid density | ρ₂ | kg/m³ | | Entrainment ratio | R = W₂/W₁ | dimensionless |