physics.fluid.iso_venturi

• Golden tests 0 / 0
• Boundary tests 0 / 0
• Property tests 5 / 5
• Production surface contract 1 / 1
}
• Engine tested Yes
• Source checked Yes
• Artifact integrity PASS
• Production attestation Embedded snapshot: STALE · Last attested schema matched 1.0.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status PASS (0 stale; 164 CURRENT) @ 2026-09-18T02:44:05.986Z
• Semantic contract PASS
• Evidence attested at 2026-09-18T02:44:05.231Z
• Last production check 2026-09-18T02:44:05.231Z
• Public / cache PASS
• Origin PASS
• Supplemental domain review Not performed
• Named expert review Not performed

• release artifacts aligned PASS

Fingerprint sha256:161f5369b562d37af9a5fca26cda9e3a47228ba90679f1788b27f98e9ea804e0

Input schema sha256:34a7b4bf9eb9c529cbb3db84c9b95e6110b6022113413870dc19c1bb59511405 · Output schema sha256:1c709535e6fb11daae178a62b27d70707d7f345f9425433bb407c903ae709632 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

iso-venturi

Engine

iso-venturi

Engine build

2026-09-18

Evidence core

2026-09-18T00:57:14.019Z

Rendered

2026-09-18T03:31:40.488Z

Last reviewed

—

Assumptions

• ISO 5167-4 classical Venturi tube: Q = C E A2 √(2Δp/ρ); C from convergent type; β and Re_D bound the ISO envelope; incompressible ε=1; C is reported, not an input
• Machined C=0.995, D∈[50 mm,250 mm], β∈[0.40,0.75], Re_D∈[2e5,1e6]. Rough-welded C=0.985. As-cast C=0.984
• Not a given C_d=0.98, not ISA 1932 nozzle, not RHG orifice, not Q=Av, not Darcy f, not compressible ε

Limitations

• ISO 5167-4 classical Venturi tube: Q = C E A2 √(2Δp/ρ); C from convergent type; β and Re_D bound the ISO envelope; incompressible ε=1; C is reported, not an input
• Machined C=0.995, D∈[50 mm,250 mm], β∈[0.40,0.75], Re_D∈[2e5,1e6]. Rough-welded C=0.985. As-cast C=0.984
• Not a given C_d=0.98, not ISA 1932 nozzle, not RHG orifice, not Q=Av, not Darcy f, not compressible ε