This GC column flow calculator determines outlet column flow, average linear gas velocity, and hold-up time for a single capillary column using column dimensions, inlet and outlet pressures, temperature, carrier gas, and gas viscosity. Hold-up time and velocity are calculated assuming an outlet pressure of 14.696 psig for gas compressibility.
GC Column Flow Calculator Interface
What inputs are required ?
- Capillary column dimensions
- Inlet and outlet pressure
- Temperature and carrier gas
Outputs of GC Column Flow Calculator
- Gas viscosity
- Outlet flow
- Average linear velocity
- Hold-up time
Before You Go
Want to understand how this calculator works behind the scenes?
The full article with explanation is available at Column Flow Calculation in GC: From Equation to Practical Use in Gas Chromatography Columns series.
This calculator applies to single capillary columns operating under steady-state conditions. For systems involving multiple columns, restrictors, or pressure-controlled junctions, separate calculators are required to account for flow splitting and pressure interactions. Accurate estimation of column flow, linear velocity, and hold-up time is essential for method development, retention time prediction, and diagnosing performance issues.
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