Coefficient of Friction in Hydrodynamic Lubrication Calculator

Coefficient of friction (μ_h):

Dynamic viscosity of the lubricant (η):

Relative velocity between moving surfaces (U):

Pressure (P):

Lubricant film thickness (h):

How This Is Calculated

$$ \mu_h = \frac{ \eta \cdot U }{ P \cdot h } $$ where:

μ_h = Coefficient of friction (Dimensionless)

η = Dynamic viscosity of the lubricant (Pa s)

U = Relative velocity between moving surfaces (m/s)

P = Pressure (Pa)

h = Lubricant film thickness (m)

Assumptions

The system is in steady state.
Fluid flow is laminar.
The lubricant is incompressible.
The fluid is newtonian.
The lubricant is in the hydrodynamic regime.

Related Calculators

Boundary Lubrication Friction Coefficient