Thrust-collar air bearing, orifice/slot — fixed reference geometry (A)
Reference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 — fixed) for a thrust-collar aerostatic bearing with an outer feed zone and an inner vacuum/exhaust zone.
Load capacity, F205.48 N
Stiffness, S46.4 N/µm
Total mass flow, ṁ11.23 mg/s
Outer/inner zone flow ratio, ṁ₁/ṁ₂2.409
Volume flow, Q0.567 l/min
Squeeze/permeability number, σ1.552
Perturbed recess pressure, pᵣ0.34
The legacy "please login" demo lock froze D0/H0/B1. This port keeps the original fixed geometry and formula exactly, exposing only the zone-radii, pressure and permeability inputs that were already free to vary.
Method & references
- Thrust-collar aerostatic bearing with an outer feed zone and an inner vacuum/exhaust zone.
- FIXED GEOMETRY: outer diameter 40 mm, film 5 µm, β=0.6 — same rationale as the other c12_4*/c12_5* 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_5a.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.