= Cunningham slip correction factor (crucial for sub-micron particles) ρprho sub p = Particle density ( = Aerodynamic particle diameter ( μgmu sub g = Gas viscosity ( Step 5: Fractional Efficiency (
: Calculates the psychrometric changes as hot raw gas is saturated before entering the throat.
) is the most important factor in determining the operating cost of the scrubber. The most common correlation used in design calculations is the Johnstone equation or the Calvert modification.
You can paste these Excel formulas into your spreadsheet cells (assuming you name your input cells accordingly).
Even with an updated tool, design flaws occur: venturi scrubber design calculation xls upd
The most common equation is the Calvert Equation : $$ \Delta P = \fracV_t^2 \times L5050 \times 10^-3 $$ (Where $V_t$ is throat velocity in ft/sec and $L$ is Liquid-to-Gas ratio in gal/1000 ft³) .
Include dropdown menus for gas composition to auto-populate densities and viscosities. Tab 2: Sizing & Fluid Dynamics Program the throat area, converging cone angles (typically ), and diverging cone angles ( for optimal pressure recovery).
Many Excel tools use for efficiency and pressure drop.
require precise engineering formulas to achieve high particulate collection efficiency and optimal pressure drop. This comprehensive guide breaks down the core mathematical models, sizing steps, and fluid dynamics equations used to build a reliable venturi scrubber design calculation XLS spreadsheet . 1. Venturi Scrubber Process Overview = Cunningham slip correction factor (crucial for sub-micron
Calculate the cross-sectional area of the throat using the actual gas flow rate:
To build an accurate design spreadsheet, several critical variables must be accounted for:
The following parameters are essential for a complete venturi scrubber design: Flow rate (ACFM), temperature ( ∘Fraised to the composed with power F ∘Craised to the composed with power C ), and moisture content (% v/v).
Typically expressed in gallons per 1,000 cubic feet of gas. You can paste these Excel formulas into your
: Uses established models like the Calvert cut diameter method to predict collection efficiency for specific particle sizes.
Hardcoded physical constants (gas constants, density of air at STP, water viscosity tables).
Run the Sensitivity Analysis table (built-in Excel Data Table). The XLS plots efficiency vs. ΔP, revealing the economic optimum at L/G = 0.8 L/m³ (pressure drop = 45 inches WC).
