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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2017014797
pages 319-336

ATOMIZATION OF VISCOELASTIC FLUIDS WITH AN IMPINGING JET INJECTOR: MORPHOLOGY AND PHYSICAL MECHANISM OF THREAD FORMATION

Michele Negri
DLR, German Aerospace Center, Institute of Space Propulsion, Lampoldshausen, Langer Grund, 74239 Hardthausen, Germany
Helmut K. Ciezki
German Aerospace Center (DLR), Institute of Space Propulsion, 74239 Hardthausen, Germany

ABSTRAKT

The influence of elasticity on the atomization of viscoelastic fluids in an impinging jet injector has been studied. Tests with several elastic fluids with constant shear viscosity (Boger fluids) have been conducted. The morphology of the breakup has been studied, focusing in particular on the nature of the liquid sheet and of the rim and on the type of breakup of flapping sheets. Regime diagrams have been built, showing the influence of the Weber and elasticity numbers on the morphology. In the second part a physical mechanism has been proposed to explain how the viscoelastic liquid sheet formed by an impinging jet injector breaks up forming threads. The formation of such structures has been correlated with the evolution of the transversal ligaments formed from the disintegration of the sheet. When the elasticity is low, these ligaments break up into droplets due to capillary instability. If the elasticity is so large as to suppress or retard capillary instability, the ligaments are only deformed, leading to the formation of threads.


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