Gas chromatographic experiments have been performed in a truly rectangular channel with a 60∶1 cross-sectional aspect ratio, constructed according to the field-flow fractionation technology. It is shown that the peak broadening is controlled by the thickness of the channel while the maximum load is determined by the largest cross-sectional dimension. However, even with its elongated configuration, the side walls contribute significantly to the band broadening of solutes with a high diffusivity. Good agreement is found between the experimental plate height data and the recent theoretical calculations of Golay  taking into account the side-wall effect.
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Martin, M., Jurado-Baizaval, J.-. & Guiochon, G. Gas chromatography in open rectangular channels with large aspect ratios. Chromatographia 16, 98–102 (1982). https://doi.org/10.1007/BF02258877
- Gas chromatography
- Rectangular channel