Kowalski, Karoline ; Pollak, Stefan ; Hussong, Jeanette (2020)
Experimental investigation of cavitation induced air release.
In: EPJ Web of Conferences, 2017, 143
doi: 10.25534/tuprints-00014267
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
Variations in cross-sectional areas may lead to pressure drops below a critical value, such that cavitation and air release are provoked in hydraulic systems. Due to a relatively slow dissolution of gas bubbles, the performance of hydraulic systems will be affected on long time scales by the gas phase. Therefore predictions of air production rates are desirable to describe the system characteristics. Existing investigations on generic geometries such as micro-orifice flows show an outgassing process due to hydrodynamic cavitation which takes place on time scales far shorter than diffusion processes. The aim of the present investigation is to find a correlation between global, hydrodynamic flow characteristics and cavitation induced undissolved gas fractions generated behind generic flow constrictions such as an orifice or venturi tube. Experimental investigations are realised in a cavitation channel that enables an independent adjustment of the pressure level upstream and downstream of the orifice. Released air fractions are determined by means of shadowgraphy imaging. First results indicate that an increased cavitation activity leads to a rapid increase in undissolved gas volume only in the choking regime. The frequency distribution of generated gas bubble size seems to depend only indirectly on the cavitation intensity driven by an increase of downstream coalescence events due to a more densely populated bubbly flow.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Kowalski, Karoline ; Pollak, Stefan ; Hussong, Jeanette |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Experimental investigation of cavitation induced air release |
| Sprache: | Englisch |
| Publikationsjahr: | 30 November 2020 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2017 |
| Verlag: | EDP Sciences |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | EPJ Web of Conferences |
| Jahrgang/Volume einer Zeitschrift: | 143 |
| DOI: | 10.25534/tuprints-00014267 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/14267 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung aus Golden Open Access |
| Kurzbeschreibung (Abstract): | Variations in cross-sectional areas may lead to pressure drops below a critical value, such that cavitation and air release are provoked in hydraulic systems. Due to a relatively slow dissolution of gas bubbles, the performance of hydraulic systems will be affected on long time scales by the gas phase. Therefore predictions of air production rates are desirable to describe the system characteristics. Existing investigations on generic geometries such as micro-orifice flows show an outgassing process due to hydrodynamic cavitation which takes place on time scales far shorter than diffusion processes. The aim of the present investigation is to find a correlation between global, hydrodynamic flow characteristics and cavitation induced undissolved gas fractions generated behind generic flow constrictions such as an orifice or venturi tube. Experimental investigations are realised in a cavitation channel that enables an independent adjustment of the pressure level upstream and downstream of the orifice. Released air fractions are determined by means of shadowgraphy imaging. First results indicate that an increased cavitation activity leads to a rapid increase in undissolved gas volume only in the choking regime. The frequency distribution of generated gas bubble size seems to depend only indirectly on the cavitation intensity driven by an increase of downstream coalescence events due to a more densely populated bubbly flow. |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-142676 |
| Zusätzliche Informationen: | EFM16 – Experimental Fluid Mechanics 2016 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Strömungslehre und Aerodynamik (SLA) |
| Hinterlegungsdatum: | 20 Jun 2024 16:26 |
| Letzte Änderung: | 20 Jun 2024 16:26 |
| PPN: | 501798161 |
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| Suche nach Titel in: | TUfind oder in Google |
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