Capillary Number Flow Calculator

Use one coherent SI unit system, physical state, geometry, and documented characteristic scale across every input. Viscosity belongs to the relevant moving phase. Velocity and tension describe one interface event. Confirm whether each property belongs to the fluid, solid, interface, or transported quantity named by the formula. Mixed units can produce a plausible number whose physical meaning is wrong.

Higher values indicate greater viscous influence relative to surface tension; they do not predict wetting or breakup alone. A dimensionless ratio compares selected mechanisms under a stated model; it does not prove a flow regime, heat-transfer correlation, instability, similarity, or safe design. Geometry, boundary conditions, property variation, uncertainty, and the validity range of downstream correlations still require separate review.

No. This educational calculator performs displayed arithmetic on supplied SI values; it is not simulation, experimental validation, a correlation selector, material data, or engineering approval. Contact angle, geometry, inertia, gravity, rheology, and transition criteria remain separate. Retain source values, units, property temperatures, geometry definitions, and uncertainty, then obtain qualified review before using the result for design or safety decisions.