Thermoacoustic slotted exchanger insert: 2 in bore, 14 and 12 mm — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/thermoacoustic-slotted-exchanger-insert/  (CC BY 4.0)
Basis: Bore Ø47.5 (ASME BPE 2 in); slot width and depth from the thermal penetration depth in the network model (tools/gen_ta_power.py)
Catalog version: 2026-10-20

Sizes: see table below
- A plug at the bore diameter with 60 radial slots 1 wide and 8 deep cut along its whole length. Gas passes through the slots; heat passes between the gas and the tube wall through the 60 fins left between them, each only 8 mm from the wall. The centre Ø31.5 is solid.
- Slot hydraulic radius 0.44 mm; open area 27 % of the bore. In 20 bar helium at the generators' 25 Hz the thermal penetration depth is about 0.34 mm at 27 °C and 0.81 mm at 550 °C, so the gas in a slot is in good thermal contact.
- 14 mm: the ambient exchangers, under the clamp-on water jacket (same length). 12 mm: the hot exchanger, under the fin sleeve and burner drum. The insert is pressed into the tube so the fins conduct into the wall (fit class press).
- The exchanger works on the tube wall's temperature: the jacket, fin sleeve and drum outside are optional parts that set that temperature.

file  length_mm  slots  slot_mm  depth_mm  open_area_pct
hx-insert-2in-14  14.0  60  1.0  8.0  27.1
hx-insert-2in-12  12.0  60  1.0  8.0  27.1

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/
- Xem Studio: tools/gen_ta_power.py: the network model and every dimension on this page — code — CC BY 4.0 — https://xemstudio.com/
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/thermoacoustic-slotted-exchanger-insert/index.json
API: https://xemstudio.com/api/geometry?object=thermoacoustic-slotted-exchanger-insert