Ennayar, Hatim ; Brockmann, Philipp ; Hussong, Jeanette (2023)
LIF-based quantification of the species transport during droplet impact onto thin liquid films.
In: Experiments in Fluids, 64 (9)
doi: 10.1007/s00348-023-03688-7
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In the present study, laser-induced fluorescence (LIF) is used to investigate the mixing process of a droplet impacting onto a thin liquid film. A robust multidimensional calibration procedure is developed enabling the extraction of local instantaneous dye concentrations as well as film heights. A series of validation measurements are conducted confirming a low reconstruction error of 4.53% . The impact-induced mixing process is thoroughly investigated across various liquid film thicknesses to examine the propagation of the mixing zone and the instantaneous radial concentration gradients within it. It is shown that the maximum extent of the mixing zone scales inversely proportional with the thickness of the liquid film. Within our experiments, we discover the formation of wall-induced vortex ring instabilities subsequent to impact. The disintegration of vortex rings during droplet impact significantly enhances convection-driven mixing, as quantified by the coefficient of variation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Ennayar, Hatim ; Brockmann, Philipp ; Hussong, Jeanette |
| Art des Eintrags: | Bibliographie |
| Titel: | LIF-based quantification of the species transport during droplet impact onto thin liquid films |
| Sprache: | Englisch |
| Publikationsjahr: | 17 August 2023 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Experiments in Fluids |
| Jahrgang/Volume einer Zeitschrift: | 64 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1007/s00348-023-03688-7 |
| URL / URN: | https://link.springer.com/article/10.1007/s00348-023-03688-7 |
| Kurzbeschreibung (Abstract): | In the present study, laser-induced fluorescence (LIF) is used to investigate the mixing process of a droplet impacting onto a thin liquid film. A robust multidimensional calibration procedure is developed enabling the extraction of local instantaneous dye concentrations as well as film heights. A series of validation measurements are conducted confirming a low reconstruction error of 4.53% . The impact-induced mixing process is thoroughly investigated across various liquid film thicknesses to examine the propagation of the mixing zone and the instantaneous radial concentration gradients within it. It is shown that the maximum extent of the mixing zone scales inversely proportional with the thickness of the liquid film. Within our experiments, we discover the formation of wall-induced vortex ring instabilities subsequent to impact. The disintegration of vortex rings during droplet impact significantly enhances convection-driven mixing, as quantified by the coefficient of variation. |
| Zusätzliche Informationen: | Artikel-ID: 148 |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Strömungslehre und Aerodynamik (SLA) DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen > Projektbereich A: Generische Experimente DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen > Projektbereich A: Generische Experimente > A03: Untersuchung der schnellen erzwungenen Entnetzung von Substraten mit komplexer Oberflächenmorphologie DFG-Sonderforschungsbereiche (inkl. Transregio) > Transregios DFG-Sonderforschungsbereiche (inkl. Transregio) > Transregios > TRR 150 Turbulent chemisch reagierende Mehrphasenströmungen in Wandnähe |
| Hinterlegungsdatum: | 31 Aug 2023 05:58 |
| Letzte Änderung: | 30 Nov 2023 09:39 |
| PPN: | 511189931 |
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