Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope
This paper describes the combination of experimental measurements with mathematical–physical analysis during the investigation of flow in an aperture at low pressures in a prepared experimental chamber. In the first step, experimental measurements of the pressure in the specimen chamber and at its o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/23/9033 |
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| author | Pavla Šabacká Jiří Maxa Robert Bayer Petr Vyroubal Tomáš Binar |
| author_facet | Pavla Šabacká Jiří Maxa Robert Bayer Petr Vyroubal Tomáš Binar |
| author_sort | Pavla Šabacká |
| collection | DOAJ |
| description | This paper describes the combination of experimental measurements with mathematical–physical analysis during the investigation of flow in an aperture at low pressures in a prepared experimental chamber. In the first step, experimental measurements of the pressure in the specimen chamber and at its outlet were taken during the pumping of the chamber. This process converted the atmospheric pressure into the operating pressure typical for the current AQUASEM II environmental electron microscope at the ISI of the CAS in Brno. Based on these results, a mathematical–physical model was tuned in the Ansys Fluent system and subsequently used for mathematical–physical analysis in a slip flow regime on a nozzle wall at low pressure. These analyses will be used to fine-tune the experimental chamber. Once the chamber is operational, it will be possible to compare the results obtained from the experimental measurements of the nozzle wall pressure, static pressure, total pressure and temperature from the nozzle axis region in supersonic flow with the results obtained from the mathematical–physical analyses. Based on the above comparative analyses, we will be able to determine the realistic slip flow at the nozzle wall under different conditions at the continuum mechanics boundary. |
| first_indexed | 2024-03-09T17:32:30Z |
| format | Article |
| id | doaj.art-08f9d96d095c42cdb37bf4b342dd8b9d |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T17:32:30Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-08f9d96d095c42cdb37bf4b342dd8b9d2023-11-24T12:07:21ZengMDPI AGSensors1424-82202022-11-012223903310.3390/s22239033Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron MicroscopePavla Šabacká0Jiří Maxa1Robert Bayer2Petr Vyroubal3Tomáš Binar4Institute of Scientific Instruments of the CAS, Královopolská 147, 61200 Brno, Czech RepublicInstitute of Scientific Instruments of the CAS, Královopolská 147, 61200 Brno, Czech RepublicDepartment of Electrical and Electronic Technology, Brno University of Technology, 61600 Brno, Czech RepublicDepartment of Electrical and Electronic Technology, Brno University of Technology, 61600 Brno, Czech RepublicDepartment of Electrical and Electronic Technology, Brno University of Technology, 61600 Brno, Czech RepublicThis paper describes the combination of experimental measurements with mathematical–physical analysis during the investigation of flow in an aperture at low pressures in a prepared experimental chamber. In the first step, experimental measurements of the pressure in the specimen chamber and at its outlet were taken during the pumping of the chamber. This process converted the atmospheric pressure into the operating pressure typical for the current AQUASEM II environmental electron microscope at the ISI of the CAS in Brno. Based on these results, a mathematical–physical model was tuned in the Ansys Fluent system and subsequently used for mathematical–physical analysis in a slip flow regime on a nozzle wall at low pressure. These analyses will be used to fine-tune the experimental chamber. Once the chamber is operational, it will be possible to compare the results obtained from the experimental measurements of the nozzle wall pressure, static pressure, total pressure and temperature from the nozzle axis region in supersonic flow with the results obtained from the mathematical–physical analyses. Based on the above comparative analyses, we will be able to determine the realistic slip flow at the nozzle wall under different conditions at the continuum mechanics boundary.https://www.mdpi.com/1424-8220/22/23/9033Ansys Fluentslip flowshear stressnozzlelow pressure |
| spellingShingle | Pavla Šabacká Jiří Maxa Robert Bayer Petr Vyroubal Tomáš Binar Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope Sensors Ansys Fluent slip flow shear stress nozzle low pressure |
| title | Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope |
| title_full | Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope |
| title_fullStr | Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope |
| title_full_unstemmed | Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope |
| title_short | Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope |
| title_sort | slip flow analysis in an experimental chamber simulating differential pumping in an environmental scanning electron microscope |
| topic | Ansys Fluent slip flow shear stress nozzle low pressure |
| url | https://www.mdpi.com/1424-8220/22/23/9033 |
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