// multi-utility computation suite · offline · instant · precise
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eng.journal-bearing-Sommerfeld Calculator
Calculates journal bearing minimum film thickness, eccentricity ratio, and friction coefficient using the Sommerfeld number. The Sommerfeld number S = (μN/P)(r/c)² determines the lubrication regime — full hydrodynamic lubrication requires S above a critical value that depends on L/D ratio.
Inputs
Mu Pas
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
N Rps
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
R Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
C Um
Reference formula or conversion factor shown for context.
W Kn M
Horizontal extent perpendicular to the length.
Results
Sommerfeld number S
Sample size or count used in the calculation.
minimum film thickness h_min (μm)
The smallest value in the dataset or feasible range.
regime
The operating regime — the mode or zone in which the system is currently operating.
S = (μN/p)(r/C)²
Sample size or count used in the calculation.
critical S threshold
Reference formula or conversion factor shown for context.
application
Recommended use case or application for this configuration or result.