Droplet capture with a wetted fiber

Safavi, Mohammad; Nourazar, S. Salman

doi:10.1007/s00162-021-00561-3

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…17,19,20,23,[28][29][30][31] Furthermore, previous works have examined the formation of multiple droplets via the Plateau-Rayleigh instability (PRI) of a film of liquid on a cylindrical fiber. 32,33 In addition, studies have examined wetting and coalescence of droplets on a fiber network with particular interest in droplet capture in textiles [34][35][36][37][38] However, there has been little work on the formation and interaction between multiple droplets as they traverse along a conical fiber beyond qualitative observations, 17,32,39 despite being prevalent in nature as illustrated in Fig. 1; a photograph of the Geranium robertianum fruit covered with dew drops.…”

Section: Introductionmentioning

confidence: 99%

Multiple droplets on a conical fiber: formation, motion, and droplet mergers

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Multiple droplets on a conical fiber: formation, motion, and droplet mergers

et al. 2022

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“…These studies have been summarized in Table . These studies have focused on the effect of wire orientation, − the flexibility of a wire, − wire shape, , wire temperature, wire wettability, influence of external forces, − and the eccentricity of impact ,− on the droplet capture or detachment phenomena. Mullins et al investigated the effect of fiber orientation on wettability and proposed an equation to calculate the optimum angle of fiber that enhances the efficiency of the wet filtration process.…”

Section: Introductionmentioning

confidence: 99%

“…The droplet detachment from different fiber shapes was quantified using the Eotvos number, which is the ratio of the weight of the drop to the surface tension force. Lorenceau et al, Sher et al, and Safavi and Nourazar concluded that droplet impact eccentricity (off-center impact) can improve the droplet capture efficiency of a fiber. Safavi and Nourazar showed that increasing the ratio of droplet radius to fiber radius along with increasing the droplet impact eccentricity on hydrophilic fibers would decrease the droplet capture efficiency of the fiber.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model for Droplet Capture on a Thin Wire

Priyambodo

Bhatelia

Sun

et al. 2022

Ind. Eng. Chem. Res.

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Mist elimination is a widely used separation technique in many industrial processes. Mist elimination is commonly carried out using knitted wires, and the droplet impact and capture on these wires are governed by the impact hydrodynamics. Predicting the maximum impact velocity that results in the droplet being captured on a horizontal, stationary wire (V t,max ) has previously been based on the solution of the force balance equation over an impacting droplet. However, these correlations were often based on varying simplifications, particularly in using a constant value of drag coefficient (C d ) in calculating the drag force in the force balance equations. The result of such simplifications has contributed to the discrepancy between predictions and experimental data ranging from 15 to 40%. The current work proposes a new analytical model with a correlation that was developed to predict the C d as a function of fundamental physical properties of the fluid (the ratio of viscosities) and operating parameters (the ratio of diameters). Droplet capture experiments with different wire materials and different wire and droplet sizes were also carried out. High-speed imaging was used to measure the V t,max . Results from the experiment were used to estimate the parameters in the newly developed correlation for the variable C d using a hybrid genetic algorithm (GA) and Levenberg−Marquadt algorithm (LMA) method. The new model was tested for a wide range of experimental data. It was observed that the new model was able to predict the experimental data more accurately than previously reported predictions. The model was also used to investigate the effect of wire size and fluid properties on the V t,max .

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“…Furthermore, previous works have examined the formation of multiple droplets via the Plateau-Rayleigh instability (PRI) of a film of liquid on a cylindrical fiber [33,34]. In addition, studies have examined wetting and coalescence of droplets on a fiber network with particular interest in droplet capture in textiles [35][36][37][38][39] However, there has been little work on the formation and interaction between multiple droplets as they traverse along the fiber beyond qualitative observations [17,33,40], despite being prevalent in nature as illustrated in Figure 1; a photograph of the Geranium robertianum fruit covered with dew drops.…”

Section: Introductionmentioning

confidence: 99%

Multiple droplets on a conical fiber: formation, motion, and droplet mergers

Lee¹,

Chan²,

Carlson³

et al. 2021

Preprint

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Small droplets on slender conical fibers spontaneously move along the fiber due to capillary action. The droplet motion depends on the geometry of the cone, the surface wettability, the surface tension, the viscosity, and the droplet size. Here we study with experiments and numerical simulations, the formation, spontaneous motion, and the eventual merger, of multiple droplets on slender conical fibers as they interact with each other. The droplet size and their spacing on the fibre is controlled by the Plateau-Rayleigh instability after dip-coating the conical fiber. Once these droplets are formed on the fiber, they spontaneously start to move. Since droplets of different size move with different speeds, they effectively coarsen the droplet patterning by merging on the fiber. The droplet merging process affects locally the droplet speed and alters the spatiotemporal film deposition on the fiber.

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Droplet capture with a wetted fiber

Cited by 7 publications

References 36 publications

Multiple droplets on a conical fiber: formation, motion, and droplet mergers

Multiple droplets on a conical fiber: formation, motion, and droplet mergers

Analytical Model for Droplet Capture on a Thin Wire

Multiple droplets on a conical fiber: formation, motion, and droplet mergers

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