| Title: | Numerical analysis of knudsen number of helium flow through gas-focused liquid sheet micro-nozzle |
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| Authors: | ID Kovačič, Krištof (Author)
ID Bajt, Saša (Author)
ID Šarler, Božidar (Author) |
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| Files: |  PDF - Presentation file, download (4,22 MB)
MD5: 2D504A5A9ACC62751094413B06B79CFE
 URL - Source URL, visit https://www.mdpi.com/2311-5521/9/12/273
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IMT - Institute of Metals and Technology
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| Abstract: | This work aims to verify whether the continuum mechanics assumption holds for the numerical simulation of a typical sample delivery system in serial femtosecond crystallography (SFX). Knudsen numbers were calculated based on the numerical simulation results of helium flow through the gas-focused liquid sheet nozzle into the vacuum chamber, representing the upper limit of Knudsen number for such systems. The analysed flow is considered steady, compressible, and laminar. The numerical results are mesh-independent, with a Grid Convergence Index significantly lower than 1% for global and local analysis. This study is based on an improved definition of the numerical Knudsen number: a combination of the cell Knudsen number and the physical Knudsen number. In the analysis, no-slip boundary and low-pressure boundary slip conditions are compared. No significant differences are observed. This study justifies using computational fluid dynamics (CFD) analysis for SFX sample delivery systems based on the assumption of continuum mechanics. |
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| Keywords: | Knudsen number, compressible hypersonic flow, vacuum, liquid sheet nozzle, sample delivery system, CFD |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.12.2024 |
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| Publisher: | MDPI |
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| Year of publishing: | 2024 |
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| Number of pages: | str. 1-15 |
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| Numbering: | Vol. 9, iss. 12, [art. no.] 273 |
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| Source: | Švica |
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| PID: | 20.500.12556/DiRROS-21005  |
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| UDC: | 532 |
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| ISSN on article: | 2311-5521 |
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| DOI: | 10.3390/fluids9120273 |
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| COBISS.SI-ID: | 216132867 |
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| Copyright: | © 2024 by the authors |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 22. 11. 2024;
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| Publication date in DiRROS: | 17.12.2024 |
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| Views: | 29 |
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| Downloads: | 12 |
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| Metadata: |    |
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