Advancing and receding wetting behavior of a droplet on a narrow rectangular plane

Hong, Siang Jie; Chou, Tung He; Liu, Yu Yu; Sheng, Yu Jane; Tsao, Heng Kwong

doi:10.1007/s00396-012-2797-5

Cited by 9 publications

(8 citation statements)

References 23 publications

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“…This is an advancement in the preliminary studies [21,23] on the near-wall fluorescent particle motion in a sessile droplet evaporation. Unlike the numerous numerical [50,51] or experimental and/or numerical [11,27,52,53] contact angle (CCA) modes of the droplet evaporation were followed recurrently during the evaporation process, which is consistent with the observation of some other researchers [28,[47][48][49], giving rise to asymmetrical deposition patterns. The nanoparticle concentration significantly influenced the droplet evaporation rate, leading to an irregular deposition patterns.…”

Section: Resultssupporting

confidence: 87%

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Deposition pattern and tracer particle motion of evaporating multi-component sessile droplets

Amjad

Yang

Raza

et al. 2017

Journal of Colloid and Interface Science

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The understanding of near-wall motion, evaporation behavior and dry pattern of sessile nanofluid droplets is fundamental to a wide range of applications such as painting, spray drying, thin film coating, fuel injection and inkjet printing. However, a deep insight into the heat transfer, fluid flow, near-wall particle velocity and their effects on the resulting dry patterns is still much needed to take the full advantage of these nano-sized particles in the droplet. This work investigates the effect of direct absorptive silicon/silver (Si/Ag) hybrid nanofluids via two experiments. The first experiment identifies the motion of tracer particles near the triple line of a sessile nanofluid droplet on a super-hydrophilic substrate under ambient conditions by the multilayer nanoparticle image velocimetry (MnPIV) technique. The second experiment reveals the effect of light-sensitive Si/Ag composite nanoparticles on the droplet evaporation rate and subsequent drying patterns under different radiation intensities. The results show that the presence of nanoparticle in a very small proportion significantly affects the motion of tracer particles, leading to different drying patterns and evaporation rates, which can be very important for the applications such as spray coating and inkjet printing.

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Section: Resultssupporting

confidence: 87%

“…The evaporation of the droplets in the current study followed the CCR mode during the initial evaporation phase while the CCA mode was followed at the dry out phase of the droplet as shown in Fig. 5, which is in-line with the observation from a few other researchers [28,[47][48][49].…”

Section: Near-wall Tracer Particle Motion Analysissupporting

confidence: 90%

Deposition pattern and tracer particle motion of evaporating multi-component sessile droplets

Amjad

Yang

Raza

et al. 2017

Journal of Colloid and Interface Science

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“…Contact angle (θ) measurement is one of the most globally accepted approach for quantifying reservoir wettability. Typically, the θ is generally not unique as it is dependent on whether the liquid droplet on the surface of the substrate is advancing (θa) or receding (θr) [91]. The receding angle (θr) measurement is achieved via contraction of the liquid drop, thus, considered the angle at the receding edge of the water droplet or the de-wetting angle.…”

Section: Contact Angle Measurementmentioning

confidence: 99%

Wettability alteration of oil-wet limestone using surfactant-nanoparticle formulation

Nwidee

Lebedev

Barifcani

et al. 2017

Journal of Colloid and Interface Science

117

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Wettability remains a prime factor that controls fluid displacement at pore-scale with substantial impact on multi-phase flow in the subsurface. As the rock surface becomes hydrophobic, any oleic phase present is tightly stored in the rock matrix and produced (hydrocarbon recovery) or cleaned up (soil-decontamination) by standard waterflooding methods. Although surface active agents such as surfactants have been used for several decades for changing the wetting states of such rocks, an aspect that has been barely premeditated is the simultaneous blends of surfactants and nanoparticles. This study thus, systematically reports the behaviour of surfactants augmented nanoparticles on wettability alteration. Contact angle, spontaneous imbibition, and mechanistic approaches were adopted to assess the technical feasibility of the newly formulated wetting agents, tested over wide-ranging conditions to ascertain efficient wetting propensities. The contact angle measurement is in good agreement with the morphological and topographical studies and spontaneous imbibition. The wetting trends for the formulated systems indicate advancing and receding water contact angle decreased with increase in nanoparticle concentration and temperature, and the spontaneous water imbibition test also showed faster water-imbibing tendencies for nanoparticle-surfactant exposed cores. Thus, the new formulated nanoparticle-surfactant systems were considered suitable for enhancing oil recovery and soil-decontamination, particularly in fractured hydrophobic reservoirs.

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“…It can be seen from Fig. 9 that the advancing and receding angles [18] increase before t = 0.01 s, because the droplet  gradient produces shear stress that deforms the interface. Moreover, changes in the interface curvature vary the internal and external differential p values, thereby altering θ.…”

Section: Deformation and Variation Of Dynamic Contactmentioning

confidence: 95%

Thermocapillary migration mechanism of molten silicon droplets on horizontal solid surfaces

et al. 2017

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Abstract:Effective lubrication under extreme conditions such as high temperature is of considerable importance to ensure the reliability of a mechanical system. New lubricants that can endure high temperatures should be studied and employed as alternatives to traditional oil-based lubricant. In this paper, a thermocapillary model of a silicone-oil droplet is developed by solving the Navier-Stokes and energy equations to obtain the flow, pressure, and temperature fields. This is accomplished using a conservative microfluidic two-phase flow level set method designed to track the interface between two immiscible fluids. The numerical simulation accuracy is examined by comparing the numerical results with experimental results obtained for a silicone-oil droplet. Hence, the movement and deformation of molten silicon droplets on graphite and corundum are numerically simulated. The results show that a temperature gradient causes a tension gradient on the droplet surface, which in turn creates a thermocapillary vortex. As the vortex develops, the droplet migrates to the low-temperature zone. In the initial stage, the molten silicon droplet on the corundum substrate forms two opposite vortex cells, whereas two pairs of opposite vortices are formed in the silicone fluid on the graphite substrate. Multiple vortex cells gradually develop into a single vortex cell, and the migration velocity tends to be stable. The greater the basal temperature gradient, the stronger the internal thermocapillary convection of the molten silicon droplet has, which yields higher speeds.

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Advancing and receding wetting behavior of a droplet on a narrow rectangular plane

Cited by 9 publications

References 23 publications

Deposition pattern and tracer particle motion of evaporating multi-component sessile droplets

Deposition pattern and tracer particle motion of evaporating multi-component sessile droplets

Wettability alteration of oil-wet limestone using surfactant-nanoparticle formulation

Thermocapillary migration mechanism of molten silicon droplets on horizontal solid surfaces

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