Impact of a microfluidic jet on a pendant droplet

Quetzeri-Santiago, Miguel A.; Hunter, Ian W.; Meer, Devaraj van der; Rivas, David Fernández

doi:10.1039/d1sm00706h

Cited by 9 publications

(33 citation statements)

References 47 publications

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“…In figure 4 the dashed line shows the experimental threshold between embedding and traversing for the impact of a microfluidic jet on pendant droplets [31]. We find that the threshold for traversing Newtonian capillary bridges is higher than for pendant droplets.…”

Section: A Model For the Cavity Expansionmentioning

confidence: 88%

“…The threshold for traversing the Newtonian capillary bridges is within 10 % of the model prediction. In contrast, for the PEO 600k and 1M 1.0 wt % the threshold deviates in ≈ 50 %, as the liquid viscoelasticity influences the process [31].…”

Section: A Model For the Cavity Expansionmentioning

confidence: 88%

“…The laser is focused at the microfluidic chip with a 10x objective. The liquid jet impacting speed U 0 and its diameter D 0 were controlled with the microchannel geometry, its distance to the focal point of the microscope objective and by varying the laser power from 0.4 W to 2.1 W. A detailed description of the system can be found elsewhere [31].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Multiples studies have been dedicated to the cavity expansion and the evolution of its dimensions after a water entry event [12,31,[37][38][39]. At the moment of jet impact, the cavity creation is dominated by inertia (W e >> 1).…”

Section: A Model For the Cavity Expansionmentioning

confidence: 99%

“…In addition to studying the cavity geometry during expansion, we tested the model for the critical velocity of a jet traversing a liquid droplet that we developed previously [31]. Assuming that the surface tension dominates during the cavity collapse and using the shape of the cavity described by equation 4 we can predict the time of the collapse of the cavity [31],…”

Section: A Model For the Cavity Expansionmentioning

confidence: 99%

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Cavity dynamics after the injection of a microfluidic jet in capillary bridges

Quetzeri-Santiago¹,

Rivas²

2022

Preprint

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The impact of solid and liquid objects (projectiles) onto liquids and soft solids (targets) generally results on the creation and expansion of an air cavity inside the impacted objects. The dynamics of cavity expansion and collapse depends on the projectile inertia as well as on the target properties.In this paper we study the impact of microfluidic jets generated by thermocavitation processes on a capillary bridge between two parallel planar walls. Different capillary bridge types were studied, Newtonian liquids, viscoelastic liquids and agarose gels. Thus, we compare the cavity formation and collapse between a wide range of material properties. Moreover, we model the critical impact velocity for a jet to traverse a capillary bridge type. Our results show that agarose gels with a storage modulus lower that 176 Pa can be modelled as a liquid for this transition. However, the predicted transition deviates for agarose gels with higher storage modulus. Additionally, we show different types of cavity collapse, depending on the Weber number and the capillary bridge properties. We conclude that the type of collapse determines the number and size of entrained bubbles. Furthermore, we study the effects of wettability on the adhesion forces and contact line dissipation. We conclude that upon cavity collapse, for hydrophobic walls a Worthington jet is energetically favourable. In contrast, for hydrophilic walls, the contact line dissipation is in the same order of magnitude of the energy of the impacted jet, suppressing the Worthington jet formation. Our results provide strategies for preventing bubble entrapment and give an estimation of the cavity dynamics for needle-free injection applications and additive manufacturing among other applications.

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Section: A Model For the Cavity Expansionmentioning

confidence: 88%

Section: A Model For the Cavity Expansionmentioning

confidence: 88%

Section: Experimental Methodsmentioning

confidence: 99%

Section: A Model For the Cavity Expansionmentioning

confidence: 99%

Section: A Model For the Cavity Expansionmentioning

confidence: 99%

See 3 more Smart Citations

Cavity dynamics after the injection of a microfluidic jet in capillary bridges

Quetzeri-Santiago¹,

Rivas²

2022

Preprint

Self Cite

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Jet injectors: Perspectives for small volume delivery with lasers

Schoppink

Rivas

2022

Advanced Drug Delivery Reviews

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The capture of airborne particulates by rain

Speirs

Belden²,

Hellum³

2023

J. Fluid Mech.

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Rain cleans pollution out of the atmosphere, as droplets collide with airborne particles during free fall. Such particle–droplet collisions have been presumed to be capture events, but the details of such collisions lack thorough investigation. We show that rain droplets and pollution particles interact through multiple collision behaviours, including captures on the droplet surface, cavity-forming droplet entries and ricochets. Rain drop diameter and free fall velocity, in addition to pollution particle density, size, wettability and droplet impact location, determine which capture or escape behaviour occurs. Our findings reveal that rain does not capture all airborne pollutants equally even upon collision, and certain pollutants prove more difficult to remove from the air than others. Consequently, we must account for both rain and pollution characteristics to understand pollution capture mechanisms and pollution fluxes in the environment.

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Impact of a microfluidic jet on a pendant droplet

Abstract: High speed microfluidic jets can be generated by a thermocavitation process: from the evaporation of the liquid inside a microfluidic channel, a rapidly expanding bubble is formed and generates a...

Cited by 9 publications

References 47 publications

Cavity dynamics after the injection of a microfluidic jet in capillary bridges

Cavity dynamics after the injection of a microfluidic jet in capillary bridges

Jet injectors: Perspectives for small volume delivery with lasers

The capture of airborne particulates by rain

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