In an XLS sheet, this is frequently predicted using the empirical curves established by the or analytical formulations based on momentum balance:
If the pressure ratio across the nozzle is less than critical ( ≈0.528is approximately equal to 0.528
Your Excel sheet should have a clear "Inputs" section for the following parameters: Pressure ( Ppcap P sub p ), Temperature ( Tpcap T sub p ), and Mass Flow Rate ( Suction Fluid ( ): Pressure ( Pecap P sub e ), Temperature ( Tscap T sub s ), and Molecular Weight ( MWcap M cap W Discharge Condition ( ): Required Backpressure or Exit Pressure ( Pccap P sub c 2. Core Calculation Steps ejector design calculation xls
This yields: (A_t \approx 1.47 \times 10^-5 \text m^2)
: Usually calculated using a standard 5∘5 raised to the composed with power 7∘7 raised to the composed with power divergence angle to prevent flow separation. 4. Visualizing Flow Profiles in Ejector Columns In an XLS sheet, this is frequently predicted
Use either:
An effective design spreadsheet should employ well-established thermodynamic formulas, typically based on the or Keenan and Neumann theories. Phase 1: Nozzle Design (Isentropic Expansion) Visualizing Flow Profiles in Ejector Columns Use either:
Utilize Excel's Data Table tool or VBA arrays to plot the relationship between suction pressure and entrainment ratio. This creates the characteristic curve of the ejector. 4. Excel Implementation Matrix
Ejectors are passive devices that use high-pressure motive fluid to entrain and compress a lower-pressure suction fluid. This paper details the empirical and analytical formulas required to automate design in Excel, specifically addressing non-choked flow regimes. 1. Nomenclature & Parameters
R=WsWm≈PsPd⋅f(velocities)cap R equals the fraction with numerator cap W sub s and denominator cap W sub m end-fraction is approximately equal to the square root of the fraction with numerator cap P sub s and denominator cap P sub d end-fraction end-root center dot f of open paren velocities close paren 6. Conclusion
Drop-down menus for fluid selection (Steam, Air, Water, Custom Gas). Tab 3: Core Calculations (The Engine)