An experimental note on the deformation and breakup of viscoelastic droplets rising in non-Newtonian fluids

Ortiz, Susana L.; Lee, Julia S.; Figueroa-Espinoza, Bernardo; Mena, B.

doi:10.1007/s00397-016-0970-3

Cited by 20 publications

(24 citation statements)

References 14 publications

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“…When the drop reaches the the critical volume V c (Figure 3b), a tail appears. According to Ortiz et al [20] and Zenit and Feng [17], the appearance of the tail coincides with the formation of a negative wake. This tail will undergo a capillary instability where droplets are produced.…”

Section: Experimental Observations: Different Regimesmentioning

confidence: 83%

“…This critical volume corresponds to the appearance of a negative wake behind the drop. This negative wake has been already studied in various cases, for bubbles [14][15][16]18,20,21,23], and for drops [11,17,20]. The main difference between the drop and the bubble case is that the interfacial tension between the air and the liquid is larger than that for two liquids.…”

Section: Tail Appearance and Breakupmentioning

confidence: 88%

“…This appears for bubbles and drops rising in a viscoelastic surrounding fluid, and is directly linked with the appearance of a negative wake behind the bubble/drop. Above the critical volume V c , the rising velocity U increases more rapidly with the volume V. Considering the non-Newtonian properties of the surrounding fluid (shear-thinning and viscoelastic), it is not possible to predict the shape of the curve over this critical volume, but many other experimental examples have reported similar behaviour for drops or bubbles [14,20,21,23]. where the tail appearance is.…”

Section: Experimental Observations: Different Regimesmentioning

confidence: 99%

“…More interestingly, for the case of a drop, a recent study by [20] found that a long thin tail formed from the cusp at the rear edge of the drop. This long tail became unstable, fragmenting into small droplets that were then left behind the main drop.…”

Section: Introductionmentioning

confidence: 97%

“…The sudden increase has not been understood fully until recently [17]: a combination of effects has to occur simultaneously. First the viscoelastic nature of the outside liquid induces a change in shape of the drop or bubble, forming a characteristic cusped shape [14,15,[19][20][21]; resulting from this change of shape, the drag coefficient of the object is reduced. Consequently, the speed increases, which, given the shear-thinning properties, will cause the viscosity around the object to decrease, causing an even further rising velocity increase.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Encapsulation of Droplets Using Cusp Formation behind a Drop Rising in a Non-Newtonian Fluid

Poryles

Zenit

2018

Fluids

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Abstract:The rising of a Newtonian oil drop in a non-Newtonian viscous solution is studied experimentally. In this case, the shape of the ascending drop is strongly affected by the viscoelastic and shear-thinning properties of the surrounding liquid. We found that the so-called velocity discontinuity phenomena is observed for drops larger than a certain critical size. Beyond the critical velocity, the formation of a long tail is observed, from which small droplets are continuously emitted. We determined that the fragmentation of the tail results mainly from the effect of capillary effects. We explore the idea of using this configuration as a new encapsulation technique, where the size and frequency of droplets are directly related to the volume of the main rising drop, for the particular pair of fluids used. These experimental results could lead to other investigations, which could help to predict the droplet formation process by tuning the two fluids' properties, and adjusting only the volume of the main drop.

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Section: Experimental Observations: Different Regimesmentioning

confidence: 83%

Section: Tail Appearance and Breakupmentioning

confidence: 88%

Section: Experimental Observations: Different Regimesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Encapsulation of Droplets Using Cusp Formation behind a Drop Rising in a Non-Newtonian Fluid

Poryles

Zenit

2018

Fluids

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Droplet Shape and Drag Coefficients in Non‐Newtonian Fluids: A Review

Sun

2023

ChemBioEng Reviews

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The motion of droplets in non‐Newtonian fluids is widely present in ubiquitous industrial processes. Understanding the droplet motion characteristics is important for optimizing the design of related processes. Here the progress in the research on the droplet motion characteristics in non‐Newtonian fluids is reviewed. The mechanism of droplet deformation in non‐Newtonian fluids were elucidated, the influence of different rheological properties on droplet shape was discussed, and the empirical correlations of droplet aspect ratio were summarized. Moreover, the dimensionless correlations of drag coefficient were discussed. There are relatively few drag coefficient correlations of droplets in non‐Newtonian fluids, while the correlation of drag coefficients of bubbles in non‐Newtonian fluids can provide some reference. Finally, the possible prospects for future studies of the subject were proposed.

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The influence of the negative wake on the deformation and breakup of viscoelastic droplets

Carril-Naranjo

Mena²,

Samayoa

et al. 2021

Korea-Aust. Rheol. J.

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Experiments were performed using visual and PIV techniques in order to study the appearance of a negative wake as well as its influence upon the deformation and breakup of droplets rising in viscoelastic fluids. In this report, Newtonian and viscoelastic drops were injected through different viscoelastic fluids; the deformation of the droplets was then followed and analyzed. In the case of Newtonian drops traveling through a viscoelastic fluid, a tail appears which later breaks into satellite droplets; a negative wake is present on the sides of the tail. The viscoelastic drops also exhibit a tail which is more resistant to rupture and the negative wake appears after the tail; additionally, a bump appears at the tip of the tail which enhances its elongation and determines the onset of breakup.

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An experimental note on the deformation and breakup of viscoelastic droplets rising in non-Newtonian fluids

Cited by 20 publications

References 14 publications

Encapsulation of Droplets Using Cusp Formation behind a Drop Rising in a Non-Newtonian Fluid

Encapsulation of Droplets Using Cusp Formation behind a Drop Rising in a Non-Newtonian Fluid

Droplet Shape and Drag Coefficients in Non‐Newtonian Fluids: A Review

The influence of the negative wake on the deformation and breakup of viscoelastic droplets

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