Nonsteady-state flow in gas chromatography during fast changes in inlet pressure
| Autor: | Tal M. Nahir |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Chromatography
Gas Chromatography Chemistry Organic Chemistry Flow (psychology) General Medicine Biochemistry Nonlinear differential equations Capillary gas chromatography Analytical Chemistry Physics::Fluid Dynamics Inlet pressure Nonsteady state Pressure Gas chromatography Transient (oscillation) Retention time |
| Zdroj: | Journal of Chromatography A. 1029:275-278 |
| ISSN: | 0021-9673 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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