Contact line behavior for a highly wetting fluid under superheated conditions

Raj, Rishi; Kunkelmann, Christian; Stephan, Peter; Plawsky, Joel L.; Kim, J.

doi:10.1016/j.ijheatmasstransfer.2011.12.026

Cited by 68 publications

(59 citation statements)

References 29 publications

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“…In such technologies, the evaporation rate is a key contributor to the overall system efficiency -as it dictates the droplet lifetime and corresponding rates of heat and mass transfer. With this said, a droplet's evaporation rate ( _ m LG ) is commonly correlated with several interdependent factors/parameters, including contact line dynamics/motion [7,[13][14][15][16]; substrate surface structure [17], energy [18], and thermal conductivity [19]; vapor/gas concentration and convection [20,21]; and the thermofluid properties of the evaporating fluid itself [22]. Thus, from an overarching perspective, droplet evaporation can be considered a relatively complex phenomena.…”

Section: Introductionmentioning

confidence: 99%

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Gleason

Voota

2016

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Gleason

Voota

2016

International Journal of Heat and Mass Transfer

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“…Kandlikar [19] derived a CHF relation that included the effect of receding contact angle and orientation of the surface relative to the gravity vector. Janecek and Nikolayev [20] found a weak effect of the surface forces on the apparent contact angle, while Raj et al [21] and Ajayev et al [22] showed that the recoil force does not influence the apparent receding contact angle.…”

Section: Introductionmentioning

confidence: 99%

Observations of the Critical Heat Flux Process During Pool Boiling of FC-72

Jung

Kim

2014

Journal of Heat Transfer

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Experimental work was undertaken to itivestigate the process by which pool-boiling critical heat flux (CHF) occurs using an IR camera to measure the local temperature and heat transfer coefficients on a heated silicon surface. The wetted area fraction (WF), the contact line length density (CLD), the frequency between dryout events, the lifetime of the dry patches, the speed of the advancing and receding contact lines, the dty patch size distribution on the surface, and the heat transfer from the liquid-covered areas were measured throughout the boiling curve. Quantitative analysis of this data at high heat flux and transition through CHF revealed that the boiling curve can simply be obtained by weighting the heat flux from the liquid-covered areas by WF. CHF mechanisms proposed in the literature were evaluated against the observations.

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“…In nature, surface chemistry and roughness are widely used to manipulate liquidsolid interactions 9,10 . Inspired by these strategies, considerable efforts have focused on understanding, replicating and improving these approaches to design engineered fluidic-based systems [11][12][13][14] . A significant portion of research has been directed towards the design of efficient water-repellant surfaces, such as superhydrophobic surfaces, where droplets reside in a nonwetting composite state typically known as Cassie-Baxter droplets 15 .…”

mentioning

confidence: 99%

High-resolution liquid patterns via three-dimensional droplet shape control

Raj

Adera

Enright³

et al. 2014

Nat Commun

104

105

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Understanding liquid dynamics on surfaces can provide insight into nature's design and enable fine manipulation capability in biological, manufacturing, microfluidic and thermal management applications. Of particular interest is the ability to control the shape of the droplet contact area on the surface, which is typically circular on a smooth homogeneous surface. Here, we show the ability to tailor various droplet contact area shapes ranging from squares, rectangles, hexagons, octagons, to dodecagons via the design of the structure or chemical heterogeneity on the surface. We simultaneously obtain the necessary physical insights to develop a universal model for the three-dimensional droplet shape by characterizing the droplet side and top profiles. Furthermore, arrays of droplets with controlled shapes and high spatial resolution can be achieved using this approach. This liquid-based patterning strategy promises low-cost fabrication of integrated circuits, conductive patterns and bio-microarrays for high-density information storage and miniaturized biochips and biosensors, among others.

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Contact line behavior for a highly wetting fluid under superheated conditions

Cited by 68 publications

References 29 publications

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Observations of the Critical Heat Flux Process During Pool Boiling of FC-72

High-resolution liquid patterns via three-dimensional droplet shape control

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