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Volumetric Flow Rate & Rectangular Duct Width x Height to Flow Velocity Calculator

Flow Velocity Factors
Volume Flow (Q) [?]
per (/)
Width [?]
Height [?]
Calculate Speed of Flow
Flow Velocity (v) [?]
per (/)
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  • Calculate volumetric flow rate from flow speed and the width x height of the duct
  • Calculate mass flow rate from volumetric flow rate and density
  • Convert volumetric flow rates to other units
  • Convert width and height into to other units
  • Convert flow speed to other units

Contents

Toggle
  • User Guide
    • Formula
      • Symbols
    • Volumetric Flow Rate Measured
    • Width
    • Height
    • Flow Velocity Calculation

User Guide

This tool will calculate the velocity in any units from the specified volumetric flow rate of a substance flowing through a rectangular duct of a defined width and height. For each new calculation a unique conversion scale will be generated for the range of volumetric flow rates and flow speeds for the length and width specified.

Formula

The flow velocity formula used by this calculator is:

v = Q / (w · h)

Derived from:

v = Q / A

A = w · h

Symbols

  • Q = Volume flow rate
  • v = Flow velocity
  • A = Cross-sectional area
  • w = Width
  • h = Height

n.b. This formula assumes uniform flow conditions within the entire cross-sectional area of duct, without any friction losses near to surfaces.

Volumetric Flow Rate Measured

Enter the volumetric amount of substance that will flow pass in a unit of time.

Width

Enter the internal width of the section of duct being used to measure flow.

Height

Enter the internal height of the section of duct being used to measure flow.

Flow Velocity Calculation

This is the speed at which the substance is moving.

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