Related Experiment Video
Updated: Aug 7, 2026

Curtain Flow Column: Optimization of Efficiency and Sensitivity
Published on: June 12, 2016
Theoretical approximation for the linear flow of carrier gas through a rectangular gas chromatographic column
1Technispan LLC, 1209 Malbay Drive, Lutherville, Maryland 21093, USA. tspan@verizon.net
Abstract:
A simple relationship for the average linear velocity of carrier gas flowing through a rectangular gas chromatographic column is derived. Since the relationship agrees remarkably well with published experimental data taken from a variety of sources, it should be very useful in practical application. This is particularly true for micro-fabricated etched silicon columns that often have a rectangular cross-section. Knowledge of the average linear velocity facilitates calculation of the height equivalent to a theoretical plate (HETP), a measure of resolution for the column.
Related Concept Videos
Column Efficiency: Rate Theory
During elution, a solute molecule experiences numerous transitions between stationary and mobile phases, exhibiting irregular residence times in...
Diffusion on Chromatography Columns
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
Gas Chromatography: Types of Columns and Stationary Phases
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
Gas Chromatography: Introduction
In GC, a sample is vaporized and mixed with an inert carrier gas (the mobile phase), which transports it through a column.
Column Efficiency: Plate Theory
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...
Analyte Adsorption and Distribution

