✅ I’ve prepared a ready-to-use Ejector Design Spreadsheet that includes:
📥 Click here to download → (replace with your actual download link)
(If you’re building your own, search for “Constant Pressure Mixing Model” – e.g., the ESDU 85032 method works well in Excel.)
Best for liquid-liquid ejectors (e.g., pumping seawater with a pressurized water jet). Assumes mixing occurs in a constant cross-section throat. ejector design calculation xls
Key equation:
This is where spreadsheets shine. Assuming constant-area mixing (most common model), apply conservation of momentum:
$$(W_m + W_s) \cdot V_2 = W_m \cdot V_m + P_s \cdot A_t - P_2 \cdot A_t$$ 📥 Click here to download → (replace with
Where $V_2$ is velocity at end of throat (subsonic after shock). Your XLS must solve for $V_2$ iteratively.
A simplified practical approach used in industry XLS templates: Use the empirical entrainment ratio correlation by El-Dessouky (2002) for steam-jet ejectors: $$Er = 0.85 \times \left( \fracP_mP_s \right)^0.77 \times \left( \fracP_dP_s \right)^-1.13$$
While empirical, this is highly reliable for preliminary sizing and is easily embedded in XLS. Best for liquid-liquid ejectors (e
Ejectors (also called jet pumps or eductors) are fluid handling devices that use the Venturi effect to convert pressure energy of a motive fluid into velocity energy, creating a vacuum that draws in a suction fluid. They are widely used in chemical plants, oil refineries, HVAC systems, and marine applications.
An Excel-based ejector design calculator (.xls) provides engineers with a fast, transparent, and iterative method for sizing ejectors without resorting to expensive commercial software—especially useful for preliminary design, educational purposes, or field troubleshooting.