Flow Velocity Calculator

Volumetric flow rate in cubic meters per hour
Internal pipe diameter in millimeters
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What This Calculator Does

This calculator computes fluid velocity (V) using the continuity equation V = Q/A. Velocity is a critical design parameter: velocities below 0.6 m/s risk sediment accumulation and air pockets, while velocities above 2.5 m/s cause erosion, noise, and excessive pressure loss. The calculator also determines flow regime (laminar/transitional/turbulent) using the Reynolds number.

Key Points:
  • Based on continuity equation (conservation of mass)
  • Optimal velocity range: 0.6 - 2.5 m/s for water
  • Reynolds number determines flow regime
  • Valid for incompressible fluids
Calculation Steps:
  1. Enter all required parameters
  2. Click "Update Calculation"
  3. Review results and analysis
Formula Variables:
V Velocity (m/s)
Q Flow Rate (m³/s)
A Cross-sectional Area (m²)