Self-propulsion of Leidenfrost Drops between Non-Parallel Structures

Luo, Cheng; Mrinal, Manjarik; Wang, Xiang

doi:10.1038/s41598-017-12279-6

Cited by 20 publications

(6 citation statements)

References 39 publications

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“…There is also a force caused by the difference in Laplace pressure between the front and rear bubble meniscieach with a different radius of curvature due to the changing gap height [39]. Δp = γ(1/R1_front -1/R1_back), here R1_front and R1_back are the front and rear meniscus radius, which can be found geometrically [41] and which differ due the changing gap. For the bubble geometry in Figure 7, this approach suggests a force of around ~75 µN (see Supporting Information 2.6) directed in the upstream direction (due to the non-wetting nature of the bubble in a gap that converges in the direction of flow).…”

Section: Supporting Information 25)mentioning

confidence: 99%

Effects of beverage carbonation on lubrication mechanisms and mouthfeel

Vlădescu

Bozorgi

et al. 2021

Journal of Colloid and Interface Science

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The perception of carbonation is an important factor in beverage consumption which must be understood in order to develop healthier products. Herein, we study the effects of carbonated water on oral lubrication mechanisms involved in beverage mouthfeel and hence taste perception. Friction was measured in a compliant PDMS-glass contact simulating the tongue-palate interface (under representative speeds and loads), while fluorescence microscopy was used to visualise both the flow of liquid and oral mucosal pellicle coverage.When carbonated water is entrained into the contact, CO2 cavities form at the inlet, which limit flow and thus reduce the hydrodynamic pressure. Under mixed lubrication conditions, when the fluid film thickness is comparable to the surface roughness, this pressure reduction results in significant increases in friction (>300% greater than under non-carbonated water conditions). Carbonated water is also shown to be more effective than non-carbonated water at debonding the highly lubricious, oral mucosal pellicle, which again results in a significant increase in friction. Both these transient mechanisms of starvation and salivary pellicle removal will modulate the flow of tastants to taste buds and are suggested to be important in the experience of taste and refreshment. For example this may be one reason why flat colas taste sweeter.

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Section: Supporting Information 25)mentioning

confidence: 99%

Effects of beverage carbonation on lubrication mechanisms and mouthfeel

Vlădescu

Bozorgi

et al. 2021

Journal of Colloid and Interface Science

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“…Droplet transport and control have always had potential applications in the fields of industry, medicine, biotechnology, and microfluidics. − There are some droplet motion phenomena in nature, such as shorebirds feed through their beaks, , spider silk to directionally collect water, rice leaves with anisotropic sliding properties have the ability to directionally control the movement of water droplets, and water transport on peristome surfaces . Inspired by these natural phenomena, some special structures based on bionics can be used to drive droplet motion. − According to the previous studies, it can be concluded that one of the key factors to drive droplet motion is the surface structure whose differences mainly derive from materials and geometry.…”

Section: Introductionmentioning

confidence: 99%

Motion of Droplets in Lyophilic Axially Varying Geometry-Gradient Tubes

Xiao

et al. 2023

Langmuir

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Droplet transport occurs frequently in nature and has a wide range of applications. We studied the droplet motion in a lyophilic axially varying geometry-gradient tube (AVGGT). The motion of the AVGGT in two directionsfrom the large opening side (L) to the small opening side (S) and from S to Lwas theoretically and experimentally analyzed. The droplet dynamic behaviors, such as the self-transport behavior and the droplet stuck behavior, are explored from the view points of mechanics and energy. We found that the surface tension force of a three-phase contact line can be either a driving or an impeding force depending on the various droplet geometries in different AVGGTs. An important contributing factor to the self-transport behavior of a droplet moving from L to S in an AVGGT is the bridge liquid force caused by negative pressure inside the droplet, which is always pointing in the direction of S. As a result of experiments, we investigated the relationship between droplet motion and correlated parameters. The theoretical model based on the simplified Navier–Stokes equation was developed to explain the corresponding mechanism of the droplet motion. Additionally, dimensional analysis was carried out for the droplet stuck behavior of a droplet moving from S to L in an AVGGT to investigate the relationship between the droplet stopping location and the correlated parameters and thus obtain the required geometry for the droplet stopping location.

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“…They also reported the bidirectional motion of the droplet barrel within a wedge-shaped space composed of two hydrophobic SLIPS and conducted theoretical investigations which were important outcomes and formulated a general framework to inspire the design of self-propelled droplet transport. , However, the droplet constrained in-between the wedge-shaped space of two hydrophobic SLIPS moves slowly and tends to stop at an equivalent position where the driving force equals the sliding resistance, which manifests the difficulty of long-distance droplet transport. Although the use of the wedge-shaped structure combined with the Leidenfrost effect can initiate ultrafast droplet self-propulsion, the surface temperature needs to be carefully manipulated, and it is not applicable for controlled long-term transport because of the evaporation of the liquid droplets. − …”

Section: Introductionmentioning

confidence: 99%

Architecture-Driven Fast Droplet Transport without Mass Loss

Zhuang

Wang

et al. 2021

Langmuir

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Spontaneous droplet transport without mass loss has great potential applications in the fields of energy and biotechnology, but it remains challenging due to the difficulty in obtaining a sufficient driving force for the transport while suppressing droplet mass loss. Learning from the slippery peristome of Nepenthes alata and wedge topology of a shorebird beak that can spontaneously feed water against gravity, a combined system consisting of two face-to-face hydrophilic slippery liquid-infused porous surfaces (SLIPS) with variable beak-like opening and spacing was proposed to constrain the droplet inbetween and initiate fast droplet transport over a long distance of 75 mm with a maximum speed of 12.2 mm•s −1 without mass loss by taking advantage of the Laplace pressure gradient induced by the asymmetric shape of the constrained droplet. The theoretical model based on the Navier−Stokes equation was developed to interpret the corresponding mechanism of the droplet transport process. In addition, in situ sophisticated droplet manipulations such as droplet mixing are readily feasible when applying flexible 304 stainless foil as the substrate of SLIPS. It is believed that extended research would contribute to new references for the precise and fast droplet motion control intended for energy harvest and water collection devices.

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Self-propulsion of Leidenfrost Drops between Non-Parallel Structures

Cited by 20 publications

References 39 publications

Effects of beverage carbonation on lubrication mechanisms and mouthfeel

Effects of beverage carbonation on lubrication mechanisms and mouthfeel

Motion of Droplets in Lyophilic Axially Varying Geometry-Gradient Tubes

Architecture-Driven Fast Droplet Transport without Mass Loss

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