Annular regenerator screen ring: 100 mesh, Ø47.5 / Ø41.5, for a 2 in tri-clamp Stirling — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/fpse-regenerator-screen-ring/  (CC BY 4.0)
Basis: Urieli & Berchowitz screen relations: porosity 1 − π m d / 4, hydraulic diameter d·β/(1 − β); heat transfer and friction from Gedeon & Wood (1996)
Catalog version: 2026-10-20

Sizes: see table below
- 389 rings of 100 mesh, 0.1 mm wire screen stacked 77.8 mm high in the annulus between the liner (Ø41.5) and the hot spool's bore (Ø47.5), on the liner's spokes and under its rim.
- Porosity 0.691, hydraulic diameter 0.223 mm, frontal area 419 mm². At the design point the regenerator's NTU is 165 (effectiveness 0.9940), its enthalpy loss 5.4 W.
- Stack the rings with the weave of each layer turned a little against the last; fill the annulus exactly, so the rim holds the stack.

feature  value
ring  Ø47.5 / Ø41.5 × 0.2
count  389
screen  100 mesh, 0.1 mm wire
porosity  0.691
hydraulic Ø mm  0.223

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Ohio University (Urieli): Stirling cycle machine analysis: ideal adiabatic and simple analysis (after Urieli & Berchowitz, Stirling Cycle Engine Analysis, 1984) — web — author's site — https://www.ohio.edu/mechanical/stirling/
- NASA (NTRS, public domain): Gedeon & Wood (1996), Oscillating-flow regenerator test rig: correlations for screens and felts, NASA CR-198442 (f = 129/Re + 2.91 Re^-0.103; Nu = (1 + 0.99 Pe^0.66) β^1.79) — PDF — US Government work, public domain — https://ntrs.nasa.gov/citations/19960015878
- 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/fpse-regenerator-screen-ring/index.json
API: https://xemstudio.com/api/geometry?object=fpse-regenerator-screen-ring