{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "regenerator-screen-disc-47-5",
 "name": "Regenerator screen disc: Ø47.5, 100 mesh × 0.10 mm wire",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Heat & regenerator",
 "year": null,
 "question": "What screen should a 2 inch thermoacoustic regenerator use?",
 "tags": [
  "regenerator",
  "screen",
  "mesh",
  "thermoacoustic",
  "tri-clamp",
  "long earth society"
 ],
 "aliases": [
  "regenerator screen disc 2 inch",
  "100 mesh regenerator",
  "thermoacoustic regenerator screen",
  "stirling regenerator mesh disc"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/regenerator-screen-disc-47-5/",
 "sheet_txt": "https://xemstudio.com/objects/regenerator-screen-disc-47-5/sheet.txt",
 "sheet": {
  "basis": "Woven-screen geometry from Swift (porosity 1 − π m d / 4, hydraulic radius φ d / 4(1 − φ)); friction from Swift & Ward",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "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."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "diameter",
     "Ø47.5"
    ],
    [
     "mesh",
     "100 per inch"
    ],
    [
     "wire",
     "0.1 mm"
    ],
    [
     "layer",
     "0.2 mm"
    ],
    [
     "porosity",
     "0.691"
    ],
    [
     "hydraulic radius",
     "55.9 µm"
    ]
   ]
  }
 },
 "sheet_text": "Regenerator screen disc: Ø47.5, 100 mesh × 0.10 mm wire — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/regenerator-screen-disc-47-5/  (CC BY 4.0)\nBasis: Woven-screen geometry from Swift (porosity 1 − π m d / 4, hydraulic radius φ d / 4(1 − φ)); friction from Swift & Ward\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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).\n- 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).\n- No centre hole: nothing passes through these regenerators.\n- Fit: the disc edge is a slide fit in the bore; a gap at the edge would let gas bypass the screen.\n\nfeature  value\ndiameter  Ø47.5\nmesh  100 per inch\nwire  0.1 mm\nlayer  0.2 mm\nporosity  0.691\nhydraulic radius  55.9 µm\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- 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/\n- 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\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/regenerator-screen-disc-47-5/index.json\nAPI: https://xemstudio.com/api/geometry?object=regenerator-screen-disc-47-5\n",
 "sources": [
  {
   "publisher": "G. W. Swift (Acoustical Society of America / LANL)",
   "title": "Thermoacoustics: A Unifying Perspective for Some Engines and Refrigerators (Rott's equations, the energy equation, screen relations; the method behind DeltaEC)",
   "url": "https://www.lanl.gov/org/ddste/aldps/materials-physics-applications/condensed-matter-magnet-science/thermoacoustics/",
   "formats": [
    "web",
    "book"
   ],
   "license": "cited",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "J. Thermophysics and Heat Transfer (G. W. Swift, W. C. Ward)",
   "title": "Simple harmonic analysis of regenerators, 10(4), 652-662 (1996): stacked-screen friction c1(φ) = 1268 − 3545φ + 2544φ²",
   "url": "https://doi.org/10.2514/3.842",
   "formats": [
    "web"
   ],
   "license": "journal article; cited",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "regenerator-mesh-disc",
  "thermoacoustic-slotted-exchanger-insert",
  "list-ta-ring-3x2in",
  "list-ta-twin-piston-2in"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [
  {
   "feature": "disc edge",
   "exact": "Ø47.5",
   "mates": "2 in spool bore: no bypass at the wall",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "thickness",
   "exact": "0.20 (100 mesh × 0.10 wire, one woven layer)",
   "mates": "the next disc",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "How many discs?",
   "a": "Length ÷ 0.2 mm: 500 for 100 mm."
  },
  {
   "q": "Why not wool or a scrubber?",
   "a": "Those pack unevenly; stacked screens give a known porosity and hydraulic radius, which the model needs."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "screen-disc-47.5-m100",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/regenerator-screen-disc-47-5/screen-disc-47.5-m100.step",
   "stl": "https://xemstudio.com/files/hardware/regenerator-screen-disc-47-5/screen-disc-47.5-m100.stl",
   "note": "woven screen disc Ø47.5 × 0.2 (two wire diameters): 100 mesh, 0.1 mm wire, the regenerator of the generators"
  }
 ],
 "markdown": "https://xemstudio.com/objects/regenerator-screen-disc-47-5/index.md"
}