Engineering calculator reviewed for preliminary design use · Last updated: March 2026
Calculate Weber number We = ρv²L/σ. Apply to droplet breakup, bubble formation, and mist generation analysis. Use for spray nozzle design and gas-liquid contactor evaluation.
What this calculator is used for
The Weber number compares inertial forces to surface tension forces and is used
to assess droplet and bubble stability in multiphase systems.
Typical engineering use cases
Spray and atomization analysis
Gas-liquid contact equipment screening
Governing equation and methodology
We = ρ · v² · L / σ
Engineering assumptions and limitations
Representative characteristic length
Practical design notes
Weber number should be reviewed alongside Reynolds and Froude numbers to
understand interfacial behavior.
We = ρv²L/σ predicts whether a droplet or jet will remain intact or break up. High We (>12 for droplets) indicates breakup is likely. Low We means surface tension holds the droplet together.
How is Weber number used in spray design?
In spray nozzle design, We determines the droplet size distribution. Higher We at the nozzle exit produces finer droplets. It also affects spray penetration distance and evaporation rate.
These results are preliminary estimates for screening-level design use. They do not replace detailed engineering, code compliance verification, or vendor-certified calculations.