Reynolds Number Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-216

Effect

Computation or source lookup only

Input and validation requirements

The specification leaves internal versus external classification thresholds and negative-velocity convention unspecified, and μ = 0 produces an undefined result that must be rejected rather than numerically evaluated.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "flow_type": "internal_smooth_circular_pipe",
    "rho_kg_m3": 998,
    "velocity_m_s": 2,
    "characteristic_length_m": 0.05,
    "mu_Pa_s": 0.001
  },
  "expected_outputs": {
    "Re": 99800,
    "flow_regime": "turbulent"
  },
  "working": "Re=ρVL/μ=(998 kg/m³)(2 m/s)(0.05 m)/(0.001 Pa·s)=99.8/0.001=99,800. Since Re>4000, the regime is turbulent."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json