Off-centered impact of water droplets on a thin horizontal wire

Sher, Eran; Haim, Lev; Sher, I.

doi:10.1016/j.ijmultiphaseflow.2013.03.002

Cited by 31 publications

(9 citation statements)

References 9 publications

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“…Flow Regime Analysis. The droplet impact process is controlled by gravity, inertial force, surface tension, friction force, and viscous force, but the effect of viscous force can be negligible according to the present research [27]. Two nondimensional numbers are the crucial parameters to determine the droplet morphology after impact on a thin wire when the diameter ratio of the droplet and the thin wire is constant, that is, a Weber number of = V 0 2 / (the ratio of inertial force to surface tension) and a Bond number of = 2 / (the ratio of gravity to surface tension).…”

Section: Merging Mode As Illustrated Inmentioning

confidence: 69%

“…Whereas in that study the threshold velocity was measured under conditions of symmetric impact, Lorenceau et al [26] then considered the positions of the drop's impact relative to the fiber and surprisingly found that an off-center impact enhanced the ability of the fiber to capture the drop. Sher et al [27] experimentally studied the off-center impact of water droplets on thin horizontal wires and the amount of liquid trapped on a dry, smooth horizontal wire was determined, and a nondimensional criterion was proposed. Kim and Kim [28] experimentally identified three outcomes of collision (capture, single drop fall, and splitting) when the drop impacted a thin fiber and they developed a theoretical model to predict the residual water mass that was critically dependent on the fiber thickness, rather than the impact velocity.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics of Droplet Impingement on a Thin Horizontal Wire

Zheng

Jing

et al. 2018

Mathematical Problems in Engineering

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A model of droplet impacting on a thin horizontal wire is developed and numerically analyzed via level set method (LSM). Through varying the impact velocity, the flow regimes of droplet impacting on the wire are examined and analyzed. The detailed hydrodynamic behaviors including transient velocity and pressure distributions as well as the evolution of the gas-liquid interface during droplet impingement are investigated. The results indicate that the hanging mode, merging mode, and splitting mode appear during the droplet impingement on a thin horizontal wire. In merging mode, the tiny bubbles converge to big bubbles arising from the inertia difference between the liquid and the gas make. Due to the dynamic equilibrium between the friction of the thin wire and the droplet surface tension, the double reflux zone and the high-pressure zone are only observed in hanging mode rather than in merging mode and splitting mode. The flow regimes diagram depending on We and Bo is provided to represent the flow regimes of droplet impacting on a thin horizontal wire. The corresponding exponential correlations are given in form of We = aebBo to distinguish the boundaries between these droplet flow regimes.

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Section: Merging Mode As Illustrated Inmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of Droplet Impingement on a Thin Horizontal Wire

Zheng

Jing

et al. 2018

Mathematical Problems in Engineering

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“…They used droplets of silicone-oil and water, falling eccentrically on a thin cylindrical fiber. In [32,33], the effect of the relative distance between the droplet and the fiber on the capture criteria was studied and quantified. In [34,35], the eccentric impact of a droplet on a flexible fiber was studied.…”

Section: Introductionmentioning

confidence: 99%

Pore-Scale Simulation of the Interaction between a Single Water Droplet and a Hydrophobic Wire Mesh Screen in Diesel

Elsayed

Kirsch

Krull

et al. 2021

Fluids

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Recently, the trend towards sustainable energy production and pollution control has motivated the increased consumption of ultra-low-sulfur diesel (ULSD) or bio-fuels. Such fuels have relatively low surface tension with water and therefore, the separation of water from fuel has become a challenging problem. The separation process relies on using porous structures for the collection and removal of water droplets. Hence, understanding the interaction between water droplets and the separators is vital. The simplest geometry of a separator is the wire mesh screen, which is used in many modern water–diesel separators. Thus, it is considered here for systematic study. In this work, pore-scale computational fluid dynamics (CFD) simulations were performed using OpenFOAM® (an open-source C++ toolbox for fluid dynamics simulations) coupled with a new accurate scheme for the computation of the surface tension force. First, two validation test cases were performed and compared to experimental observations in corresponding bubble-point tests. Second, in order to describe the interaction between water droplets and wire mesh screens, the simulations were performed with different parameters: mean diesel velocity, open area ratio, fiber radii, Young–Laplace contact angle, and the droplet radius. New correlations were obtained which describe the average reduction of open surface area (clogging), the pressure drop, and retention criteria.

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“…Eccentric impacts have a higher probability of occurring in actual systems, and they decrease Uc [3,5,6]. However, when the drop is impacting at velocities above Uc, eccentric impacts can increase the amount of liquid that remains on the cylinder after the drop splits [5,6]. Increasing R * increases the Uc of droplet capture [1,2,7,8].…”

Section: Introductionmentioning

confidence: 99%

Off-centred impacts of droplets on horizontal cylinders with large curvature ratios

Bouchard

Sidawi

Chandra

2021

ICLASS

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Drop impact on cylindrical objects is a natural phenomenon with important industrial applications, e.g., mesh-style mist eliminators, where the goal is to capture drops on the mesh wires. The impact velocity of the drop on a cylinder is one factor that determines the amount of a drop that is captured, with drops impacting at greater than a threshold velocity only being partially captured by the fibre. The threshold velocity will change depending on how offcentered (eccentric) the drop impacts the cylinder, and the ratio of the fibre and drop diameters, known as the curvature ratio, R * . Currently, little experimental data exists for the threshold velocity of drops impacts in the range of We<14 and curvature ratios R * >1, which this study is designed to provide. This parameter space is equivalent to drops on the order of 10 microns impacting fibers with diameters on the order of 100 microns. We show that the threshold velocity of capture decreases for increasing eccentricity and increases for increasing R * . This is in agreement with results for droplet impacts where the R * <1.

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Off-centered impact of water droplets on a thin horizontal wire

Cited by 31 publications

References 9 publications

Hydrodynamics of Droplet Impingement on a Thin Horizontal Wire

Hydrodynamics of Droplet Impingement on a Thin Horizontal Wire

Pore-Scale Simulation of the Interaction between a Single Water Droplet and a Hydrophobic Wire Mesh Screen in Diesel

Off-centred impacts of droplets on horizontal cylinders with large curvature ratios

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