Ejector Design Calculation Xls !exclusive! May 2026

Mastering Ejector Design Calculation Using Excel Spreadsheets (.xls): A Complete Engineering Guide

Introduction

Ejectors (also known as jet pumps, eductors, or siphon pumps) are simple yet highly efficient devices that use the Venturi effect to transport fluids, gases, or slurries. Unlike mechanical pumps, ejectors have no moving parts, making them ideal for harsh environments, high-temperature applications, and explosive atmospheres. However, designing an ejector is a delicate balance of fluid dynamics, thermodynamics, and empirical correction factors.

• Compute β from mass and momentum balance closed-form or iteratively.
• Overall ejector efficiency η_e = (useful work to entrain fluid) / (motive energy expended) — often approximated as (m_s * (h_s,out - h_s,in)) / (m_p*(h_p,in - h_p,out)).
• Compute compression ratio P_d/P_s and verify ejector can achieve required discharge pressure at given motive conditions.

References

Tab 4: Optimal Area Ratio (ARM) Calculation

This is the heart of the ejector. The Area Ratio = (Throat area) / (Nozzle throat area). ejector design calculation xls