Marangoni number

The Marangoni number (Mg) is a dimensionless number named after Italian scientist Carlo Marangoni. The Marangoni number may be regarded as proportional to (thermal-) surface tension forces divided by viscous forces. It is - for example - applicable to propellant behaviour calculations in spacecraft tanks or bubble and foam research.

• σ: surface tension, (SI units: N/m)
• L: characteristic length, (SI units: m)
• α: thermal diffusivity, (SI units: m²/s)
• η - dynamic viscosity, (SI units: kg/(s·m)),
• ΔT: temperature difference, (SI units: °C)),

See also

• Marangoni effect