VYRCO / Cooling

Reynolds number in a circular passage

Calculate mean velocity and Reynolds number using fluid properties supplied by you.

Free · no accountv1.0 · 2026-10-10Private inputs in your browser

Reynolds number in a circular passage

VYRCO · v1.0 · https://vyrco.com/en/tools/reynolds-flow/

Input data

Numbers: use a decimal point or comma, without thousands separators. Complete fields unless marked optional.

Preparing the tool…

Your inputs are processed here and are not sent to VYRCO. There is no autosave: download your project before closing or switching languages. Opening JSON reads a local file; it does not upload it. CSV includes inputs and results. For PDF, use Print / PDF and select Save as PDF.

How to use it

Use the actual inside diameter and flow through that passage.
Copy density and viscosity at working temperature.
Review Reynolds as a dimensionless number alongside circuit geometry, losses and measurements.

Fictional example

Fictional example: velocity≈1.061 m/s; Re≈10610. No approved cooling condition is assigned.

Method

D = diameter mm/1000; Q = L/min/60000; μ = mPa·s/1000. Area = πD²/4; velocity = Q/area; Re = ρ·velocity·D/μ.

Scope and limitations

Full circular-passage model with a Newtonian fluid. Does not represent irregular sections, boiling, uncharacterized mixtures or pressure loss. No universal thresholds or setting recommendations.