TRANSPORT PHYSICS / DIMENSIONLESS RATIO
Compare viscous effects with combined inertial and surface-tension scales using fluid properties and one characteristic length.
METHOD / WORKED EXAMPLE
Compare viscous effects with combined inertial and surface-tension scales using fluid properties and one characteristic length. The ratio becomes dimensionless only when every property uses coherent units and one physical state.
WORKED DEFAULT
For water-like values and a 1 mm scale, sqrt(rho sigma L) is about 0.2683 Pa*s and Oh is about 0.00373.
READ THE RESULT
The ratio compares viscous damping with inertia and capillarity; it does not guarantee breakup mode or droplet size.
ASSUMPTIONS AND LIMITS
Nozzle geometry, gas properties, forcing, non-Newtonian behavior, instability thresholds, and breakup correlations remain outside the tool.
COMMON QUESTIONS
Use one coherent SI unit system, physical state, geometry, and documented characteristic scale across every input. All properties represent one liquid and interface state. Length matches the downstream jet or droplet model. Confirm whether each property belongs to the fluid, solid, interface, particle, or transported quantity named by the formula. Mixed conventions can produce a plausible number whose physical meaning is wrong.
The ratio compares viscous damping with inertia and capillarity; it does not guarantee breakup mode or droplet size. A dimensionless group compares selected mechanisms under a stated model; it does not prove a regime, transition, instability, similarity, or safe design. Geometry, boundary conditions, property variation, measurement 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. Nozzle geometry, gas properties, forcing, non-Newtonian behavior, instability thresholds, and breakup correlations remain outside the tool. Retain source values, units, property temperatures, geometry definitions, and uncertainty, then obtain qualified review before using the result for design or safety decisions.
RELATED TOOLS
Use boundary
Multiply density, surface tension, and length, take the square root, then divide dynamic viscosity by the resulting scale.
Oh = mu / sqrt(rho sigma L).