Air bearing, slot feeding — fixed reference geometry
Reference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 — fixed) for an aerostatic thrust bearing fed through an annular slot with nr discrete orifices.
Load capacity, F253.36 N
Load coefficient, F̄0.504
Stiffness, S81.2 N/µm
Mass flow, ṁ10.231 mg/s
Volume flow, Q0.516 l/min
Per-orifice diameter, d0.109 µm
Recess pressure ratio, pᵣ/pₛ0.68
The legacy "please login" demo lock froze D0/H0/B1. This port keeps the original fixed geometry and formula exactly, exposing only the slot/orifice-feed inputs that were already free to vary.
Method & references
- Aerostatic thrust bearing fed through an annular slot with nr discrete orifices.
- FIXED GEOMETRY: outer diameter 40 mm, film 5 µm, β=0.6 — same rationale as the other c12_4* fixed-geometry modules.
- Generalizing the outer radius is a real model change and is not done here — see docs/locked-calculators-review.md.
The computation is a literal port of the original client-side JavaScript from /calculators/c12_4e.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.