We study experimentally the stability of micrometer weakly viscoelastic jets produced with transonic flow focusing. Highly stable jets are formed when a low molecular weight polymer is added to water at a given low concentration, and the injected flow rate is reduced to its minimum value. In this case, the capillary instability is delayed, and the jet breakup occurs at distances from the ejector of the order of tens of thousands the jet diameter. The results indicate that the intense converging extensional flow in the ejection point builds up viscoelastic stress that does not relax in the jet even for times much longer than the polymer relaxation time. We hypothesize that the drag (shear) force exerted by the outer gas stream prevents the stress relaxation. It is also possible that partial polymer entanglement at the jet emission point contributes to this effect. We measure the jet length and the diameter at the ejector orifice and breakup point. The diameter takes values just above 2 μm at the breakup point regardless of the liquid flow rate and gas pressure.
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June 2022
Research Article|
June 23 2022
Unexpected stability of micrometer weakly viscoelastic jets
A. Rubio
;
A. Rubio
(Data curation, Investigation, Methodology, Visualization)
1
Depto. de Ingeniería Mecánica, Energética y de los Materiales and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura
, E-06006 Badajoz, Spain
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E. J. Vega
;
E. J. Vega
(Data curation, Investigation, Supervision)
1
Depto. de Ingeniería Mecánica, Energética y de los Materiales and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura
, E-06006 Badajoz, Spain
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A. M. Gañán-Calvo
;
A. M. Gañán-Calvo
(Conceptualization, Supervision)
2
Departamento de Mecánica de Fluidos e Ingeniería Aeroespacial, Universidad de Sevilla
, E-41092 Sevilla, Spain
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J. M. Montanero
J. M. Montanero
a)
(Conceptualization, Formal analysis, Supervision, Writing – original draft, Writing – review & editing)
1
Depto. de Ingeniería Mecánica, Energética y de los Materiales and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura
, E-06006 Badajoz, Spain
a)Author to whom correspondence should be addressed: jmm@unex.es
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a)Author to whom correspondence should be addressed: jmm@unex.es
Physics of Fluids 34, 062014 (2022)
Article history
Received:
March 11 2022
Accepted:
June 07 2022
Citation
A. Rubio, E. J. Vega, A. M. Gañán-Calvo, J. M. Montanero; Unexpected stability of micrometer weakly viscoelastic jets. Physics of Fluids 1 June 2022; 34 (6): 062014. https://doi.org/10.1063/5.0091095
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