โ๏ธ Ejector & Eductor Jet Pump
Model high-velocity motive jet entrainment, suction flow rate, 1D mixing chamber momentum balance, pressure lift ratio (N), entrainment mass ratio (Rm), and diffuser recovery.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Fluid Mechanics
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Released
Aug 2026
โฑ๏ธ Latency
< 1 ms
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Hardware & Sizing Partner: Need to size a control valve or check ASME flange bolt torque for this line?
โ๏ธ Ejector / Eductor Fluid Entrainment Dynamics
High-speed motive jet, suction entrainment & diffuser pressure recovery๐ Configuration & Presets
Key Formulations:
โข Motive Jet: Vm = Cv โ(2(Pm โ Ps)/ฯm)
โข Entrainment Ratio: Rm = mฬs / mฬm
โข Pressure Lift Ratio: N = (Pout โ Ps) / (Pm โ Ps)
โข Area Ratio: RA = Anozzle / Amix = (dm / dmix)ยฒ
โข Motive Jet: Vm = Cv โ(2(Pm โ Ps)/ฯm)
โข Entrainment Ratio: Rm = mฬs / mฬm
โข Pressure Lift Ratio: N = (Pout โ Ps) / (Pm โ Ps)
โข Area Ratio: RA = Anozzle / Amix = (dm / dmix)ยฒ
๐ Performance Results
Configure inputs and click Compute to view results.
๐ Calculation Methodology & Engineering Theory
1D Momentum Conservation
Ejectors transfer momentum from a high-velocity driving jet to a low-pressure secondary fluid within a constant-area mixing throat:
(P1 โ P2) Amix = mฬtotal V2 โ (mฬm Vm1 + mฬs Vs1) + Ffriction
Diffuser Pressure Recovery
The mixed fluid decelerates in the diverging section, converting dynamic pressure into static pressure rise:
Pout = P2 + ฮทdiff ยท ยฝ ฯmix (Vmixยฒ โ Voutยฒ)
Key Engineering Assumptions
- Complete mixing achieved within the mixing tube length ($L_{mix} \approx 6 \text{ to } 8 \cdot d_{mix}$).
- Subsonic flow in mixing section (incompressible liquid or moderate gas velocity).
- Nozzle discharge coefficient $C_v \approx 0.92 - 0.96$.
- Diffuser static pressure recovery efficiency $\eta_{diff} \approx 0.75 - 0.85$.