Reynolds number calculator API

Compute the Reynolds number (Re = ρ·v·D/μ) and classify the flow regime as laminar (<2300), transitional, or turbulent (>4000). Answers 'Reynolds number for water at 2 m/s in 0.1m pipe','is this flow laminar or turbulent','flow regime from these properties'.

Price$0.01per request

MethodPOST

Route/v1/calc/eng-reynolds-number

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

calcengineeringfluidsreynoldslaminarturbulentregimeviscosity

API URLhttps://x402.hexl.dev/v1/calc/eng-reynolds-number

Integration docs

Example request

{
  "densityKgM3": 1000,
  "velocityMs": 2,
  "diameterM": 0.1,
  "viscosityPaS": 0.001
}

Example response

{
  "densityKgM3": 1000,
  "velocityMs": 2,
  "diameterM": 0.1,
  "viscosityPaS": 0.001,
  "reynoldsNumber": 200000,
  "regime": "turbulent",
  "formula": "Re = ρ * v * D / μ"
}

Input schema

{
  "type": "object",
  "required": [
    "densityKgM3",
    "velocityMs",
    "diameterM",
    "viscosityPaS"
  ],
  "properties": {
    "densityKgM3": {
      "type": "number",
      "description": "fluid density (kg/m³)",
      "examples": [
        1000
      ]
    },
    "velocityMs": {
      "type": "number",
      "description": "velocity (m/s)",
      "examples": [
        2
      ]
    },
    "diameterM": {
      "type": "number",
      "description": "characteristic length (m)",
      "examples": [
        0.1
      ]
    },
    "viscosityPaS": {
      "type": "number",
      "description": "dynamic viscosity (Pa·s)",
      "examples": [
        0.001
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}