by Hisham Al Dessouky et al. ( Chemical Engineering & Processing , 2002): Provides the empirical constants used in most modern spreadsheets.
) : Calculated based on the combined flow rate of motive and entrained fluids. : Often estimated as . Recommended Resources and Tools
Inputs (Excel input block)
A diverging section that converts kinetic energy back into potential energy, raising the pressure of the combined mixture to the required discharge level. Core Formulas in an Ejector Calculation XLS
based on empirical curves or the . This correlation uses correction factors for molecular weight and temperature: ejector design calculation xls
This sheet functions as your control dashboard. It requires cells for: Pressure ( Pmcap P sub m ), Temperature ( Tmcap T sub m ), Molecular Weight ( Mmcap M sub m ), Specific Heat Ratio ( Suction Fluid: Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), Molecular Weight ( Mscap M sub s ), Flow Rate Requirement ( Wscap W sub s Discharge Condition: Target Discharge Pressure ( Pdcap P sub d Tab 2: Thermodynamic & Property Lookup
The XLS file accompanying this paper includes full formulas, validation cases, and charting macros. by Hisham Al Dessouky et al
$$P_discharge = P_throat + \eta_d \cdot \frac12 \rho_m (V_2^2)$$
You might ask: Why not use commercial CFD or dedicated software like Aspen EDR? : Often estimated as
Once inputs are entered, the tab populates instantly with:
Your spreadsheet must first establish the operating environment: Pressure ( Ppcap P sub p ), Temperature ( Tpcap T sub p ), and Mass Flow Rate ( ṁpm dot sub p Suction Fluid (Secondary): Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), and Molecular Weight ( MWcap M cap W Discharge Condition: Desired Discharge Pressure ( Pdcap P sub d Physical Constants: Isentropic exponent ( ) and Gas constant ( 2. Core Performance Indicators