{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a2619ae81ccd6a09acb390a700e60f3ad0c3750ab5b6582bada4c0e28fb347a5","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"11fb4cf7bccbfcb31cada0fae51353b0577d442afdbac697e8099b9844801354","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"fluid.turbulent-combustion.cellular-irregularity","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"Detonations in mixtures diluted with argon leave neat, regular cells, while in fuel-air mixtures the pattern is chaotic and pockets of unburned gas appear behind the front. What decides this, and does the irregularity change how the detonation survives?","posed_since":"","precise":"Cell regularity correlates with the stability parameter $\\chi = (E_{a}/(R T_{s})) (\\Delta_{I}/\\Delta_{R})$, the reduced activation energy times the ratio of induction length to reaction length. Determine whether $\\chi$ or another parameter quantitatively predicts the width of the cell-size distribution, whether irregular detonations burn unreacted pockets by turbulent mixing, and whether this explains the critical tube diameter $d_{c} \\sim 13\\lambda$ for irregular mixtures and its larger multiples for regular ones. An answer is a quantitative classification criterion with its mechanism.","problem_ref":null,"references":"","settled_by":"A systematic set of experiments and resolved simulations over $\\chi$ measuring cell statistics, unburned-pocket consumption and critical diameters, fitted by one criterion.","status_note":"","title":"What makes detonation cells regular in some mixtures and irregular in others?","topic_ref":"ff8822779d7d3829d62f794eaee78060074a7c7c5588960c0eae974a587339ac"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"8c3b9f4988ef79e77dc6ae8d0587529a4898debd9c88710f55ed8ecad24cb3d8","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"cb9809d8035115246bb39534cff41a4e7207f015e11f5e376fbe1a3312e0a7fb","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"R2bAGPqsfvdhM8SytVVAXz9C9pRD6-7B4C8mwBpueeNvyPWLThOqqMxw5Iz1-w1pZkN4l5jmykyo9ubOL9GFDA"},"schema":"pubphys.envelope/1"},"record_hash":"8c3b9f4988ef79e77dc6ae8d0587529a4898debd9c88710f55ed8ecad24cb3d8","leaf_index":1447}