Ejector Design Calculation - Xls Fixed

How much suction fluid can the motive fluid carry? Expansion Ratios: How the nozzle geometry affects velocity.

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."

Accessible to engineers in standard design environments. ejector design calculation xls fixed

A quality fixed XLS does not allow infinite loops. Instead, it uses :

A shock wave is pushed back into the mixing chamber. Entrainment drops to zero instantly. This is known as the critical backpressure limit . Issue C: Structural Choking in the Mixing Throat How much suction fluid can the motive fluid carry

Rm=ṁsṁmcap R m equals the fraction with numerator m dot sub s and denominator m dot sub m end-fraction Motive Nozzle Sizing (Critical Flow)

A chemical plant in Louisiana had a 15-year-old ejector design XLS. It used 42 hidden VBA macros and a WHILE loop that frequently caused Excel to crash. Every time an engineer changed the motive steam temperature, the file would enter an infinite recalculation. Look for no iterative loops, no hidden macros,

Here, we use the Momentum Equation. The spreadsheet solves for the diameter of the mixing throat ($D_throat$). A simplified iteration logic used in spreadsheets is: