: Determined by expansion ratio: $$ \fracA_nA_t = \frac1M_n \left[ \frac2k+1 \left( 1 + \frack-12 M_n^2 \right) \right]^\frack+12(k-1) $$ Note: This requires solving for Mach Number ($M_n$) at pressure $P_s$. This requires an iterative solver (Goal Seek).
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. ejector design calculation xls fixed
Real-world diffusers aren't perfect. Apply an efficiency coefficient (usually 0.65 to 0.80) to your pressure recovery calculations. Step 4: Check for Critical Flow Ensure the discharge pressure ( Pdcap P sub d : Determined by expansion ratio: $$ \fracA_nA_t =