The diffuser converts velocity back to pressure. Diffuser efficiency (η_diff) is typically 70–85%.
The (mass of suction fluid per mass of motive fluid) is the most critical result. ejector design calculation xls
If you are looking for the underlying theory to build your own model, the following papers are the industry standard: The diffuser converts velocity back to pressure
: Accounts for frictional effects during expansion and diffusion. Steam Consumption ejector design calculation xls
[ M_e = \sqrt\frac2\gamma-1\left[ \left(\fracP_mP_exit\right)^\frac\gamma-1\gamma -1 \right] ] Excel: =SQRT((2/(gamma-1))*((P_m/P_exit)^((gamma-1)/gamma)-1))
ARM = 0.98 * (CR)^(-0.5) * (P_m/P_s)^0.3 ' Approximate – replace with your digitized data
An Excel-based ejector design spreadsheet has been developed based on constant-pressure mixing theory. The tool: