Ejector Design Calculation Xls File

Then, using continuity: $$W_m = \rho_m \cdot A_n \cdot V_m$$

$$(W_m + W_s) \cdot V_2 = W_m \cdot V_m + P_s \cdot A_t - P_2 \cdot A_t$$

A simplified practical approach used in industry XLS templates: Use the by El-Dessouky (2002) for steam-jet ejectors: $$Er = 0.85 \times \left( \frac{P_m}{P_s} \right)^{0.77} \times \left( \frac{P_d}{P_s} \right)^{-1.13}$$ ejector design calculation xls

While empirical, this is highly reliable for preliminary sizing and is easily embedded in XLS. The diffuser converts velocity head back to pressure. Efficiency ($\eta_d$) typically 70-85%:

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. Download this article as a PDF, open a blank Excel workbook, and begin coding the momentum balance in Section 3. Your first working ejector XLS will be the most enlightening spreadsheet you have ever built. Then, using continuity: $$W_m = \rho_m \cdot A_n

Where $V_2$ is velocity at end of throat (subsonic after shock). Your XLS must solve for $V_2$ iteratively.

Introduction 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. Understand every cell

This allows you to required nozzle area if $W_m$ is given. Step 3: Momentum Balance in the Mixing Section (Most Critical) This is where spreadsheets shine. Assuming constant-area mixing (most common model), apply conservation of momentum: