Regenerator screen disc: Ø47.5, 100 mesh × 0.10 mm wire — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/regenerator-screen-disc-47-5/  (CC BY 4.0)
Basis: Woven-screen geometry from Swift (porosity 1 − π m d / 4, hydraulic radius φ d / 4(1 − φ)); friction from Swift & Ward
Catalog version: 2026-10-20

Sizes: see table below
- A disc of 100-mesh woven screen with 0.1 mm wire, cut to the 2 in bore (Ø47.5) and drawn as a solid disc 0.2 thick (two wire diameters, the thickness of one woven layer). Stacked, the discs fill the regenerator: 500 per ring-engine core (100 mm), 550 in the twin engine (110 mm).
- Porosity 0.69, hydraulic radius 56 µm: about a tenth of the helium's thermal penetration depth at 25 Hz, which is what a traveling-wave regenerator wants (gas and screen at the same temperature, pressure and flow in phase).
- No centre hole: nothing passes through these regenerators.
- Fit: the disc edge is a slide fit in the bore; a gap at the edge would let gas bypass the screen.

feature  value
diameter  Ø47.5
mesh  100 per inch
wire  0.1 mm
layer  0.2 mm
porosity  0.691
hydraulic radius  55.9 µm

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- G. W. Swift (Acoustical Society of America / LANL): Thermoacoustics: A Unifying Perspective for Some Engines and Refrigerators (Rott's equations, the energy equation, screen relations; the method behind DeltaEC) — web, book — cited [verify license at link] — https://www.lanl.gov/org/ddste/aldps/materials-physics-applications/condensed-matter-magnet-science/thermoacoustics/
- J. Thermophysics and Heat Transfer (G. W. Swift, W. C. Ward): Simple harmonic analysis of regenerators, 10(4), 652-662 (1996): stacked-screen friction c1(φ) = 1268 − 3545φ + 2544φ² — web — journal article; cited [verify license at link] — https://doi.org/10.2514/3.842
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/regenerator-screen-disc-47-5/index.json
API: https://xemstudio.com/api/geometry?object=regenerator-screen-disc-47-5