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Numerical and Experimental Investigations of Primary Breakup of High-Viscous Fluid at Elevated Pressure [in press]

Zhang, F.; Zirwes, T.; Wachter, S.; Jakobs, T.; Habisreuther, P.; Zarzalis, N.; Dimosthenis, T.; Kolb, T.

Abstract (englisch):
Highly-resolved numerical simulations and high-speed camera measurements have been carried out for a generic test rig with an air-assisted, external mixing nozzle. Objective of the study is to access the effect of elevated pressure on the primary atomization of a high-viscous liquid jet. The viscosity of the liquid was varied by 1 and 100 mPas and the pressure from 1 to 6 bar. Different nozzle geometries were used to keep the gas-to-liquid ratio and exit velocity of the gas constant. The numerical and experimental results showed reasonably good agreement regarding morphological behaviors of the primary breakup process. A pulsating mode instability of the primary breakup followed by a fiber type disintegration of ligaments from the liquid core has been confirmed for all cases. An increased viscosity of the liquid phase leads to larger liquid ligaments and a smaller cone angle. At elevated pressure, finer liquid fragments are disintegrated and the liquid core contracts, causing a shorter breakup length and narrower liquid cone. The simulations reveal a strongly increased kinetic energy of the liquid at higher pressure, particularly in the high frequency range, which indicates a reinforced transfer of momentum from gas to liquid phase. ... mehr

Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie (ITC)
Steinbuch Centre for Computing (SCC)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000098691
HGF-Programm 34.14.02 (POF III, LK 01) Vergasung
Erschienen in 29th European Conference on Liquid Atomization and Spray Systems, Paris, 2-4 Sep 2019
Veranstaltung 29th European Conference Liquid Atomization & Spray Systems (ILASS 2019), Paris, Frankreich, 02.09.2019 – 04.09.2019
Bemerkung zur Veröffentlichung Institute for liquid atomization and spray systems
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