METEOROLOGY – WIND CALCULATOR
Dust Devil Diameter
A precise tool.
What is the Dust Devil Diameter & How does it work?
A dust devil is a small, strong whirlwind that forms over dry, loose soil on hot sunny days. The diameter of a dust devil can be estimated using the thermal heating rate of the air.
D = sqrt{frac{4 pi Q}{rho v^2}}}
D = Diameter of dust devil, Q = Heat flux (W/m2), rho = Air density (kg/m3), v = Wind speed (m/s)
The formula accounts for the balance between the heat input and the kinetic energy of the wind, which determines the size of the dust devil.
Parameters
Result
—
Frequently Asked Questions
What is a dust devil?
A dust devil is a small, strong whirlwind that forms over dry, loose soil on hot sunny days.
How do I measure the heat flux for this calculation?
Heat flux can be measured using thermal sensors placed near the ground where the dust devil forms.
What is air density in this context?
Air density refers to the mass of air per unit volume, typically measured in kg/m³.
How does wind speed affect the diameter of a dust devil?
Higher wind speeds generally result in larger dust devils as they carry more kinetic energy.
Can this formula be used for any type of whirlwind?
This formula is specifically designed for dust devils and may not accurately represent other types of whirlwinds like tornadoes.
What units should I use for the heat flux in this calculation?
The heat flux should be measured in watts per square meter (W/m²).
Why is it important to consider air density in calculating dust devil diameter?
Air density affects how much mass is being moved by the wind, which in turn influences the size of the dust devil.
Results are for informational purposes only and do not constitute professional advice.