{
  "physical_measurements": 0,
  "units": "metres",
  "article": "One low-pressure coupon, not a cryogenic pressure vessel or a 38-channel manifold.",
  "channel": {
    "gap_m": 0.001,
    "width_m": 0.019,
    "heated_length_m": 0.05,
    "entry_m": 0.05,
    "exit_diffuser_m": 0.05,
    "exit_straight_m": 0.1,
    "adapter_outer_wall_m": 0.003,
    "coordinate_map_from_CFD": "CAD (x,y,z) = CFD (x,z,y); full span reflection restored."
  },
  "core_outer_m": [
    0.05,
    0.041,
    0.015
  ],
  "copper_volume_m3": 2.9123065322967734e-05,
  "nominal_copper_mass_kg": 0.26006897333410184,
  "fluid_volume_m3": 3.0400000000000004e-05,
  "copper_fluid_overlap_m3": 0.0,
  "thermal_screen": {
    "design_heat_W": 3.0,
    "conductivity_requirement_W_mK": 350.0,
    "maximum_one_sided_through_7mm_plate_drop_K": 0.06315789473684211,
    "conductivity_supplier_typical_W_mK": 394.0,
    "interpretation": "Conservative one-dimensional plate conduction screen only; contact, coolant and spatial uniformity must be checked with the four actual wall probes."
  },
  "wall_probe_count": 4,
  "probe_pocket_diameter_m": 0.0015,
  "minimum_probe_pocket_to_fluid_distance_m": 0.00075,
  "sources": [
    "https://www.kme.com/fileadmin/DOWNLOADCENTER/COPPER%20DIVISON/4%20Industrial%20Rolled/3_Datasheets/Datasheets_NEW_2021/Cu-OFE_01_2021_e.pdf",
    "https://trc.nist.gov/cryogenics/materials/OFHC%20Copper/OFHC_Copper_rev1.htm"
  ],
  "limits": [
    "Vendor cold plates, probe calibration, seals and adapter surface finish are unselected requirements.",
    "Hard copper flange contact sets the gap; an external flange seal must not increase or intrude into the channel.",
    "Fabrication must inspect actual gap/flatness and leak tightness before comparing with CFD.",
    "No hardware exists or has been tested."
  ],
  "files": {
    "coupon-fluid-volume.step": {
      "bytes": 63377,
      "sha256": "4ccc14a6834329b2501937ab2c419a8cf3a4e68d930f4a43994e57850a44e423"
    },
    "single-channel-coupon-assembly.step": {
      "bytes": 327901,
      "sha256": "607d09bf1654b79e938f89fea6f5ac0cbea2d3161bef296f933b6aac011eb7d3"
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    "single-channel-coupon.glb": {
      "bytes": 654232,
      "sha256": "0d436dafac591a799b0c3d2876c117a17836c935f01083baac1f5959dc9f1332"
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    "coupon-assembled.png": {
      "bytes": 891198,
      "sha256": "ca37575af44d84391f9d5b3e5ed21edf07fcb668b244dce277500e216338a8c6"
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    "coupon-exploded.png": {
      "bytes": 851544,
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}