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Nonsteady-state flow in gas chromatography during fast changes in inlet pressure
1Department of Chemistry, California State University, Chico, CA 95929-0210, USA. tnahir@csuchico.edu
Abstract:
The steady-state assumption for describing the flow in a capillary gas chromatography column fails when changes in inlet pressure are introduced at a fast rate. To accommodate the possibility of nonsteady-state conditions, or a transient behavior, a second-order nonlinear differential equation for the pressure is suggested. Good agreement between the new theoretical model and representative experimental results is shown when the inlet pressure is increased at a rate of several hundred kPa per minute; in contrast, predictions from traditional steady-state calculations are relatively poor.
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