Watson Dairy Consulting

Reynolds Number Calculator

Enter product flow and viscosity to compare line velocity, Reynolds number and flow regime across common process pipe sizes.

Inputs

Flow rate

Litres per hour (L/h). Original spreadsheet default: 30,000 L/h.

Viscosity

cP / mPa·s.

Density

kg/m³. Use 1000 to match the Excel calculator.

Target min velocity

m/s.

Target max velocity

m/s.

Suggested pipe size

—

Best matching velocity

—

Change the input values to recalculate.

Edit pipe internal diameters

Pipe size	Internal dia. (mm)	Area (mm²)	Velocity (m/s)	Reynolds no.	Flow regime	Within target?