Rapidly estimate performance without iterative coding.
): Typically . Account for friction inside the motive cone. Mixing Efficiency ( ηmeta sub m
w=A⋅ErB⋅PeC⋅PcD⋅exp(E+F⋅ln(Pp))w equals cap A center dot cap E r to the cap B-th power center dot cap P sub e to the cap C-th power center dot cap P sub c to the cap D-th power center dot exp open paren cap E plus cap F center dot l n open paren cap P sub p close paren close paren Ppcap P sub p : Motive steam pressure. Pecap P sub e : Entrained vapor pressure. Pccap P sub c : Discharge pressure. : Expansion Ratio ( : Nozzle Throat ( D2cap D sub 2 ) : Based on motive mass flow and pressure. Mixing Chamber Diameter ( D5cap D sub 5 ) : Typically 8 to 14 times the needle/nozzle diameter. Diffuser Length ( XL6cap X cap L sub 6 ) : Sized to allow flow deceleration and pressure recovery. 🧪 Advanced Modeling (CFD & 1-D) ejector design calculation xls fixed
Organize your workbook into separate, clearly labeled sections or worksheets:
If you are looking for specific, pre-built calculation files, you might find templates on specialized engineering forums like Cheresources or by searching for "steam jet ejector design Excel". Rapidly estimate performance without iterative coding
Then: W_m = W_s / R (kg/h)
The model must flag a "Subcritical Flow" error if the pressure ratio falls below: : Expansion Ratio ( : Nozzle Throat (
In the age of digital engineering, the "XLS" spreadsheet remains the quintessential tool for preliminary design and sizing. It offers transparency that complex CFD simulations often hide. This article explores the theoretical framework behind ejector sizing, how to structure these calculations in an Excel environment, and the critical concept of "Fixed Design" parameters.
Download a known working ejector spreadsheet from AIChE’s DIPPR or NIST Refprop add-in instead of unverified user uploads.
A robust spreadsheet typically includes these sections:
The ejector stops pulling vacuum entirely (breaks operation). Issue B: Discharge Pressure ( Pdcap P sub d ) is Too High