Marangoni number
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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)),
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