Download a trial of a fixed ejector calculation template (PDF preview available) and input your operating conditions. Verify that the entrainment ratio matches your existing ejector performance curve. If it does, you have found your permanent design tool. About the author: This guide was compiled using ASME PTC 37, ESDU Data Item 86030, and 12 years of process engineering experience with fixed-format calculation sheets.
They migrated to a fixed XLS built with only native Excel functions ( INDEX , MATCH , LINEST , SUMIFS ) and no VBA. The fixed version calculated the same steam ejector for a vacuum distillation column (suction pressure 50 mbar) in 0.2 seconds with a locked entrainment ratio of 3.2 kg steam per kg air.
This is why the search for an is one of the most common queries on engineering forums. Engineers are tired of floating macros, broken iterative loops, and unprotected cells. They want a fixed —meaning stable, validated, and non-crashing—spreadsheet.
Introduction In the world of fluid dynamics and process engineering, the ejector (or jet pump) remains one of the most elegant yet misunderstood pieces of equipment. With no moving parts, it uses the Venturi effect to convert pressure energy into velocity, suctioning a secondary fluid. However, designing an ejector is notoriously complex. The interplay between motive pressure, suction pressure, discharge pressure, and gas/vapor molecular weights requires iterative solving of conservation equations.
Whether you are designing a steam ejector for a vacuum drier, a gas ejector for a flare gas recovery system, or a liquid ejector for a chemical reactor, demand a fixed spreadsheet. Look for no iterative loops, no hidden macros, and a validation sheet. In the words of senior process engineers: "A fixed ejector XLS is worth a thousand simulations."
