| Title: | Numerical modelling and experimental validation of dripping, jetting and whipping modes of gas dynamic virtual nozzle |
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| Authors: | ID Kovačič, Krištof (Author)
ID Gregorc, Jurij (Author)
ID Šarler, Božidar (Author) |
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| Files: |  PDF - Presentation file, download (4,19 MB)
MD5: FCA1DD3F1409A2A2634621379D577CDE
 URL - Source URL, visit https://www.emerald.com/insight/content/doi/10.1108/HFF-09-2023-0573/full/html
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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: | Purpose – This study aims to develop an experimentally validated three-dimensional numerical model for
predicting different flow patterns produced with a gas dynamic virtual nozzle (GDVN).
Design/methodology/approach – The physical model is posed in the mixture formulation and copes
with the unsteady, incompressible, isothermal, Newtonian, low turbulent two-phase flow. The computational
fluid dynamics numerical solution is based on the half-space finite volume discretisation. The geo-reconstruct
volume-of-fluid scheme tracks the interphase boundary between the gas and the liquid. To ensure numerical
stability in the transition regime and adequately account for turbulent behaviour, the k-v shear stress
transport turbulence model is used. The model is validated by comparison with the experimental
measurements on a vertical, downward-positioned GDVN configuration. Three different combinations of air
and water volumetric flow rates have been solved numerically in the range of Reynolds numbers for airflow
1,009–2,596 and water 61–133, respectively, at Weber numbers 1.2–6.2.
Findings – The half-space symmetry allows the numerical reconstruction of the dripping, jetting and
indication of the whipping mode. The kinetic energy transfer from the gas to the liquid is analysed, and locations with locally increased gas kinetic energy are observed. The calculated jet shapes reasonably well
match the experimentally obtained high-speed camera videos.
Practical implications – The model is used for the virtual studies of new GDVN nozzle designs and
optimisation of their operation.
Originality/value – To the best of the authors’ knowledge, the developed model numerically reconstructs
all three GDVN flow regimes for the first time.
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| Keywords: | flow-focusing, dripping, jetting, whipping, gas dynamic virtual nozzle, CFD |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 05.02.2024 |
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| Publisher: | Emerald Publishing Limited |
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| Year of publishing: | 2024 |
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| Number of pages: | str. 1-27 |
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| Source: | Anglija |
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| PID: | 20.500.12556/DiRROS-18280  |
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| UDC: | 532 |
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| ISSN on article: | 0961-5539 |
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| DOI: | 10.1108/HFF-09-2023-0573 |
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| COBISS.SI-ID: | 183506435 |
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| Copyright: | © Krištof Kovačič, Jurij Gregorc and Božidar Šarler |
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| Publication date in DiRROS: | 28.02.2024 |
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| Views: | 609 |
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| Downloads: | 416 |
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