Weber Number Calculator are physic/math calculator to find Weber Number, Fluid Density, Fluid Velocity, Length or Fluid Surface Tension fast and easy.

Weber Number - Engineering Fluid Mechanics Dimensionless Value

Features:

- Instant calculation

- Result are copy able to other app

- Formula are include as reference

- Support up to 16 decimal place

- Support various unit for each input

The Weber number (We) is a dimensionless number in fluid mechanics that is often useful in analyzing fluid flows where there is an interface between two different fluids, especially for multi-phase flows with strongly curved surfaces.

Formula

Weber Number :

We = ρv²L/σ

Density :

ρ = Weσ/v²L

Velocity :

v= √Weσ/ ρL

Characteristic Length :

L = Weσ/ ρv²

Surface Tension :

σ = ρv²L/We

Where:

We = Weber Number

ρ = Density

v = Velocity

L = Characteristic Length

σ = Surface Tension

One application of the Weber number is the study of heat pipes. When the momentum flux in the vapor core of the heat pipe is high, there is a possibility that the shear stress exerted on the liquid in the wick can be large enough to entrain droplets into the vapor flow. The Weber number is the dimensionless parameter that determines the onset of this phenomenon called the entrainment limit (Weber number greater than or equal to 1). In this case the Weber number is defined as the ratio of the momentum in the vapor layer divided by the surface tension force restraining the liquid, where the characteristic length is the surface pore size.

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