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 bubble and foam research or calculations of cryogenic spacecraft propellant behaviour.
- : surface tension, (SI units: N/m)
- : characteristic length, (SI units: m)
- : thermal diffusivity, (SI units: m²/s)
- : dynamic viscosity, (SI units: kg/(s·m)),
- : temperature difference, (SI units: °C)),
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