Della Pia, Alessandro (2022) Numerical and experimental investigation of unsteady plane liquid jets. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Numerical and experimental investigation of unsteady plane liquid jets |
| Autori: | Autore Email Della Pia, Alessandro alessandro.dellapia@unina.it |
| Data: | 5 Dicembre 2022 |
| Numero di pagine: | 226 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Ingegneria Industriale |
| Dottorato: | Ingegneria industriale |
| Ciclo di dottorato: | 35 |
| Coordinatore del Corso di dottorato: | nome email Grassi, Michele michele.grassi@unina.it |
| Tutor: | nome email de Luca, Luigi [non definito] Chiatto, Matteo [non definito] |
| Data: | 5 Dicembre 2022 |
| Numero di pagine: | 226 |
| Parole chiave: | curtain flows, two-phase mixing layers, splitter plate, volume-of-fluid simulation, modal analysis, particle image velocimetry. |
| Settori scientifico-disciplinari del MIUR: | Area 09 - Ingegneria industriale e dell'informazione > ING-IND/06 - Fluidodinamica |
| Informazioni aggiuntive: | The study presented in this dissertation has been financially supported by Università degli Studi di Napoli “Federico II” and Compagnia di San Paolo, and it has been carried out under the supervision of prof. Luigi de Luca and dr. Matteo Chiatto. In the framework of the STAR Program 2020, part of the work has been done at Delft University of Technology, under the supervision of prof. Marios Kotsonis and dr. Theodoros Michelis. |
| Depositato il: | 06 Dic 2022 10:00 |
| Ultima modifica: | 09 Apr 2025 13:32 |
| URI: | http://www.fedoa.unina.it/id/eprint/14702 |
Abstract
This work deals with the numerical and experimental investigation of unsteady plane liquid jets interacting with an external gaseous environment. Two flow configurations are analyzed: the gravitational liquid sheet (curtain) flow issuing into still air, and the planar air-water mixing layer developing past a splitter plate. The curtain flow is mainly investigated through theoretical and numerical methodologies, including volume-of-fluid simulations, linear stability analysis based on a simplified theoretical model, and data-driven modal decomposition techniques. Air-water mixing layers are characterized through time-resolved particle image velocimetry measurements, performed simultaneously in gas and liquid phases. As regards the major results, three flow regimes are distinguished in the curtain dynamics: supercritical, transcritical, and subcritical regimes (depending on the Weber number), each of them revealing different features and stability properties. In particular, a discontinuity of the flow natural frequency is found numerically and experimentally in transcritical conditions. The mixing layer configuration is characterized by the presence of a wake region just behind the splitter plate, which is strongly affected by both gas and liquid physical parameters. The flow dynamics exhibits a rich variety of unsteady behaviours, including global mode oscillations at high gas Reynolds numbers and air-water dynamic pressure ratios.
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