Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

Jadidbonab, Hesamaldin; Mitroglou, Nicholas; Karathanassis, Ioannis K.; Gavaises, Manolis

doi:10.1021/acs.langmuir.7b01658

Cited by 32 publications

(19 citation statements)

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“…Droplet impacting on solid substrates exhibits complex outcomes such as deposition, prompt splash, corona splash, receding break-up, partial rebound, and complete rebound, depending on the surface characteristics. − On water-repellent superhydrophobic surfaces, an impacting drop usually manifests as an elastic rebound because of the negligible viscous dissipation caused by the air pockets trapped underlying the impinging droplet. Meanwhile, the droplet bouncing direction is not well controlled because of its minimum contact with the substrate.…”

Section: Introductionmentioning

confidence: 99%

Directional Droplet Transport Mediated by Circular Groove Arrays. Part I: Experimental Findings

et al. 2020

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Directional transport of liquid droplets is crucial for various applications including water harvesting, anti-icing, and condensation heat transfer. Here, bouncing of water droplets with patterned superhydrophobic surfaces composed of circular equidistant grooves was studied. The directional transport of droplets toward the pole of the grooves was observed. The impact of the Weber number, initial polar distance r, and geometrical parameters of the surface on the directional droplet bouncing was experimentally explored. The nature of bouncing was switched when the Weber numbers exceeded We ≅ 20−25. The rebouncing height was slightly dependent on the initial polar coordinate of the impact point for a fixed We, whereas it grew for We > 20. The weak dependence of the droplet spreading time on the Weber number was close to the dependence predicted by the Hertz bouncing, thus evidencing the negligible influence of viscosity in the process. Change in the scaling exponent describing the dependence of the normalized spreading time on the Weber number was registered for We ≅ 25. The universal dependence of the offset distance ΔL of the droplets on the Weber number ΔL/D 0 ∼ We 1.5 was established. The normalized offset distance decreased with the normalized initial polar distance as ΔL/D 0 ∼ (r/S) −1 , where D 0 and S are the droplet diameter and groove width, respectively. This research may yield more insights into droplet bouncing on patterned surfaces and offer more options in directed droplet transportation.

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Section: Introductionmentioning

confidence: 99%

Directional Droplet Transport Mediated by Circular Groove Arrays. Part I: Experimental Findings

et al. 2020

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“…Several models and approaches exist in the literature for modelling wall-wetting; they typically come under the banner of droplets impact. A detailed review of the phenomena of droplet impact on the solid unheated and heated surfaces can be found in Jadidbonab et al 40,41 , Strotos. 42,43 Depending on the contact angle between the droplet and the surface, the degree of wettability changes.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of fuel dribbling and nozzle wall wetting

Gavaises

Murali-Girija

Rodríguez

et al. 2021

International Journal of Engine Research

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The present work describes a numerical methodology and its experimental validation of the flow development inside and outside of the orifices during a pilot injection, dwelt time and the subsequent start of injection cycle. The compressible Navier-Stokes equations are numerically solved in a six-hole injector imposing realistic conditions of the needle valve movement and considering in addition a time-dependent eccentric motion. The valve motion is simulated using the immersed boundary method; this allows for simulations to be performed at zero lift during the dwelt time between successive injections, where the needle remains closed. Moreover, the numerical model utilises a fully compressible two-phase (liquid, vapour) two-component (fuel, air) barotropic model. The air’s motion is simulated with an additional transport equation coupled with the VOF interface capturing method able to resolve the near-nozzle atomisation and the resulting impact of the injected liquid on the oleophilic nozzle wall surfaces. The eccentric needle motion is found to be responsible for the formation of strong swirling flows inside the orifices, which not only contributes to the breakup of the injected liquid jet into ligaments but also to their backwards motion towards the external wall surface of the injector. Model predictions suggest that such nozzle wall wetting phenomena are more pronounced during the closing period of the valve and the re-opening of the nozzle, due to the residual gases trapped inside the nozzle, and which contribute to the poor atomisation of the injected fluid upon re-opening of the needle valve in subsequent injection events.

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“…The interaction of droplets and solid surfaces has been attractive to researchers for decades due to its application in industries including inkjet printing, spray-cooling, combustion, etc. Also, the investigation of drop impact on superhydrophobic (SH) surfaces is important in some applications such as self-cleaning, anticorrosion, anti-icing, and drag reduction .…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Water Droplet Impact on the Electrospun Superhydrophobic Cylindrical Glass: Contact Time, Maximum Spreading Factor, and Splash Threshold

2020

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The impinging of water droplets on superhydrophobic cylindrical glasses has been investigated experimentally by using a high-speed camera. The superhydrophobic cylindrical surfaces were fabricated by electrospinning technique combined with silane treatment. The effects of the diameter ratio of cylindrical glass and Weber number on the postimpact regime, contact time, maximum spreading factor, and splash threshold were investigated in the ranges 3.5–16 and 27–161, respectively. The results were compared with impact droplets on superhydrophobic flat glass and uncovered hydrophilic cylindrical glass. Three types of regimes were observed on hydrophilic and superhydrophobic cylindrical glasses including coating, splash, and splash-rebound. Results showed that contact time on the cylindrical surface is up to 50% less than the flat one. Moreover, the splash regime was started at the critical Weber number = 134 on high-diameter-ratio superhydrophobic cylindrical and flat surfaces while happening earlier when the diameter ratio is below D* < 4.

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Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

Cited by 32 publications

References 100 publications

Directional Droplet Transport Mediated by Circular Groove Arrays. Part I: Experimental Findings

Directional Droplet Transport Mediated by Circular Groove Arrays. Part I: Experimental Findings

Numerical simulation of fuel dribbling and nozzle wall wetting

Experimental Investigation of Water Droplet Impact on the Electrospun Superhydrophobic Cylindrical Glass: Contact Time, Maximum Spreading Factor, and Splash Threshold

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