Orifice-compensated hydrostatic thrust bearing, central pocket — fixed reference geometry

Reference-geometry calculator (60mm bearing radius — fixed, matching the original) for a circular hydrostatic thrust bearing with a central pocket fed through a sharp-edged orifice. Vary pocket radius, film thickness, pressure and fluid properties.

✓ validated against legacyoriginal: /calculators/c11_4.htm

Orifice-compensated hydrostatic thrust bearing, central pocket — fixed reference geometry — original diagram from /calculators/c11_4.htm

Pocket radius, R₁10⁻³ mFilm thickness, h₀10⁻⁶ mSupply pressure, pₛ−pₐ10⁶ PaViscosity, ηPa·sDensity, ρkg/m³Orifice discharge coefficient, CᴅPressure factor, β₀

Effective area ratio, Aₑ/A0.715

Dimensionless load, F*0.5

Dimensionless stiffness, S*0.693

Dimensionless flow, Q*1.028

Reynolds number, film0.46

Reynolds number, restrictor417

Orifice diameter, d0.37 10⁻³ m

Load capacity, F11.32 10³ N

Axial stiffness, S522 10⁶ N/m

Flow rate, Q2.775 10⁻⁶ m³/s

Power consumption, N5.549 W

The legacy "please login" demo lock froze the bearing radius R0 to this exact value. Per docs/phase6/OWNER-DECISIONS-BACKLOG.md K4, this fixed geometry is kept exactly as in the original and only the inputs that were already free under the lock are exposed. Generalizing it is a deliberate future decision for Anton, not made here.

Method & references

Orifice-compensated hydrostatic thrust bearing with central pocket.
FIXED GEOMETRY: bearing radius 60 mm — the original demo lock froze this value.

The computation is a literal port of the original client-side JavaScript from /calculators/c11_4.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.

Orifice-compensated hydrostatic thrust bearing, central pocket — fixed reference geometry — Engineering ABC