Use the empirical Ejector Ratio (R) from standard curves. For a fixed spreadsheet, use this polynomial (for air/steam, single stage):
Entrainment Ratio (R) = W_s / W_m
Estimate R using:
= MAX(0.1, 2.5 * (P_s / P_d)^0.85) (conservative approximation) ejector design calculation xls fixed
Then:
W_m = W_s / R (kg/h)
If you are building or auditing an Ejector Design XLS, it should contain the following specific tabs or sections. Use the empirical Ejector Ratio (R) from standard curves
Before opening a spreadsheet, one must understand the four distinct zones within an ejector. A robust calculation sheet must segment the math into these four stages: use this polynomial (for air/steam
= P_m / P_s
Example: 5 / 0.1 = 50