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Effect of elevated pressure on air-assisted primary atomization of coaxial liquid jets : Basic research for entrained flow gasification

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

Abstract:
Highly resolved numerical simulations have been conducted for a generic, coaxial air-blast atomizer designed for fundamental research of entrained flow gasification processes. Objective of the work is to gain a detailed knowledge of the influence of elevated reactor pressure on the primary atomization behaviour of high-viscous liquid jets. In agreement with measured breakup morphology and breakup regimes proposed in literature, the simulations yield a pulsating mode instability of liquid jet, along with disintegrations of fibre-type liquid fragments for different pressures. From the mechanism point of view, the breakup process has been shown to be triggered by concentric, axisymmetric ring vortices, which disturb the liquid jet surface in a first stage and penetrate further into the intact core, leading to interfacial instabilities and pinch-off of liquid ligaments. The liquid jet breaks up faster at elevated pressure, leading to a shorter core length L$_{C}$. The calculated exponent (b $\thickapprox$ -0.5) of the power law for fitting the decrease of L$_{C}$ with p agrees well with measured correlations from literature in terms of varied momentum flux ratio M and Weber number We$_{G}$, although water jets, atmospheric pressure and different air-assisted, external mixing nozzles were used in these works. ... mehr

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Postprint §
DOI: 10.5445/IR/1000124282
Frei zugänglich ab 01.01.2022
Originalveröffentlichung
DOI: 10.1016/j.rser.2020.110411
Scopus
Zitationen: 1
Dimensions
Zitationen: 1
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie (ITC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 1364-0321
KITopen-ID: 1000124282
HGF-Programm 34.14.02 (POF III, LK 01) Vergasung
Erschienen in Renewable & sustainable energy reviews
Verlag Elsevier
Band 134
Seiten Article no: 110411
Nachgewiesen in Dimensions
Scopus
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