Marangoni number - Alchetron, The Free Social Encyclopedia

The Marangoni number (Ma) 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.

M a = − d γ d T L Δ T μ α

γ: surface tension, (SI units: N/m);

L: characteristic length, (SI units: m);

α : thermal diffusivity, (SI units: m²/s);

μ : dynamic viscosity, (SI units: kg/(s·m));

∆T: temperature difference, (SI units: K).

References

Marangoni number Wikipedia

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