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Simulations of Air-assisted Primary Atomization at Different Air-to-Liquid Injection Angles for Entrained Flow Gasification

Zhang, Feichi; Zirwes, Thorsten; Wachter, Simon; Jakobs, Tobias; Habisreuther, Peter; Zarzalis, Nikolaos; Trimis, Dimosthenis; Kolb, Thomas; Bockhorn, H.

Abstract (englisch):
Highly-resolved numerical simulations have been performed for a coaxial, twin-fluid nozzle, which is designed for fundamental research of the atomization process in entrained flow gasification (EFG). Objective of the work is to reveal specifically the influence of the relative injection angle $\alpha$ between the central liquid jet and the annular airflow (external-mixing) on the primary atomization. A glycerol/water mixture with a dynamic viscosity of 200 mPa·s is atomized at atmospheric condition and with a gas-toliquid ratio of 0.6. The angle of attack between liquid and airflow has been varied from $\alpha$ = 0° to 60°. The computational grid consists of approx. 10 million cells, using a smallest resolution of 25 µm. In agreement with the corresponding experiment, the calculated breakup morphology is characterized by a pulsating mode destabilization, accompanied by disintegration of membrane-type ligaments. The breakup of the liquid jet is found to be enhanced from $\alpha$ = 0° to 30°, which leads to a decrease of the liquid core length $L_C$. This is attributable to a reinforced aerodynamic interaction or an enhanced multiphase momentum transfer from the gas to the liquid phase, respectively. ... mehr

Postprint §
DOI: 10.5445/IR/1000139421/post
Frei zugänglich ab 29.09.2022
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Steinbuch Centre for Computing (SCC)
Institut für Technische Chemie (ITC)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 28.09.2021
Sprache Englisch
Identifikator KITopen-ID: 1000139421
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Erschienen in 30. Deutscher Flammentag, Deutsche Sektion des Combustion Institutes und DVV/VDI-Gesellschaft Energie und Umwelt Dinkelacker, Friedrich; Pitsch Heinz; Scherer, Viktor (eds.)
Veranstaltung 30. Deutscher Flammentag (2021), Hannover, Deutschland, 28.09.2021 – 29.09.2021
Seiten 1116-1125
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