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Showing 1 to 20 of 39 for “"Capillary Number"”.
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Droplet behaviour in microfluidic devices
… how, with increasing flow rate ratio and capillary number, we observe more densely packed droplet flow patterns. The device with the deeper expansion channel provides more space for the droplets and they self-organise the triple-helix pattern in 3-dimension. We then use the same devices to …
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A Study of Transport of Micellar Fluids in Porous Media
… done at steady-state with a constant nominal capillary number of 10^-2. Residual phase saturation (capillary desaturation curve) and endpoint relative permeability have also been measured for three-phase micellar fluids as a function of capillary number in a Berea core. Continuous and slug …
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On the rolling motion of viscous fluid on a rigid surface
… in the vicinity of the contact line for any capillary number. A simplified asymptotic model is used here to find a global solution with a 180 contact angle. Also the effects of insoluble surfactant are checked and numerical results show there exists a critical capillary number above which …
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Vibrating lubricant-infused porous surface for enhanced liquid droplet transport
… and the Landau-Levich law — there is a zone of capillary pressure-driven flow inside the lubricant wetting ridge around the droplet base when the capillary number is much smaller than one. The viscous dissipative force, which resists this capillary suction of lubricant, depends non-linearly on …
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ΣΥΝΕΝΩΣΗ ΓΑΓΓΛΙΩΝ ΠΕΤΡΕΛΑΙΟΥ ΚΑΤΑ ΤΗΝ ΑΜΙΓΗ ΜΙΚΡΟΕΚΤΟΠΙΣΗ ΜΕΣΑ ΣΕ ΠΟΡΩΔΗ ΠΕΤΡΩΜΑΤΑ
… BETWEEN PAIRS OF OIL GANGLIA, AS A FUNCTION OF CAPILLARY NUMBER, VISCOSITY RATIO, DYNAMIC CONTACT ANGLES AND GANGLION SIZE. WE ALSO STUDY THE ABOVE VARIABLES EXPERIMENTALLY. EXPERIMENTS WERE PERFORMED IN CHAMBER- AND-THROAT PLANAR NETWORKS. THE RESULTS ARE USED TO DRAW SOME CONCLUSIONS WITH …
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Wetting transition and fluid trapping in a microfluidic fracture
… that roughness significantly reduces the capillary number threshold that onsets the wetting transition, even to a vanishing value. Above the reduced threshold, fluid is trapped in two configurations: (1) below the roughness amplitude as a thin film; (2) enveloping the rough surface as a …
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The Impact Dynamics of Weakly Charged Droplets
… The critical charge level only depends on the capillary number based on the gas viscosity. The deformation applies to common liquids and molten alloy droplets. Even dielectric surfaces can also induce conical deformation. The charged droplets can also deform upon hydrophobic surfaces, and …
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Design and Testing of a Bubble Generator for Molten Salt Surrogate Fluid
… surrogate fluid by matching the Reynolds number, Eötvös number, and Morton number defined by the properties of the helium bubbles in the pump bowl of the Molten Salt Reactor Experiment (MSRE). The injector, constructed from polydimethylsiloxane (PDMS) and acrylic, was tested to generate …
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Lattice Boltzmann simulation methods for boundaries and interfaces in multi component flow.
… simulation of immiscible fluids at low Reynolds number and low Capillary number. The Lattice Boltzmann method will be explained along with its multi-component extensions. Key method developments shall first be developed in terms of single component advancements, made in the lattice closure …
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A numerical method for electro-kinetic flow with deformable interfaces
… theories when Ca is small (Ca is the electric capillary number) for both quasi-steady state and time dependent problems are developed to check numerical simulations.
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Large Scale Simulations of Bidisperse Emulsions and Foams
… algorithms which scale as O(N2), where N is the number of droplets. In our research, we have developed a novel, fast and efficient algorithm which scales as [O( N1n(N)]. The algorithm has been implemented to simulate the low Reynolds number flow of large-scale systems of monodisperse and …
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Characterization and Control of an Electrospinning Process
… second. This bending frequency decreased as the capillary number of the solutions increased. The motion of mergence of coils of a jet was discovered and characterized. This characterization, combined with bending frequency, provides information for control of parameters in fiber collection in …
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Displacement of Fluid Droplets From Solid Surfaces
… Our goal is to predict the yield conditions (capillary number Ca) as a function of physical parameters including viscosity ratio lambda, Bond number B d and advancing and receding contact angles thetaA and thetaR. To determine the yield conditions, we conduct a computational study employing a …
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An interferometric study of spreading liquid films
… drainage, and spin-coating operations. Viscous, capillary, inertial and gravitational forces can all be important in these flows depending on the scale and speed of the spreading process. In this research, a number of benchmark problems involving moving contact lines of viscous Newtonian and …
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Jamming transition and emergence of fracturing in wet granular media
… transition between different regimes. A modified capillary number characterizes the crossover from capillary fingering to viscous fingering, and a transition from fingering to fracturing can be achieved either by decreasing frictional resistance. The balance between frictional, viscous, and …
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Instabilities in newtonian films and nematic liquid crystal droplets
… D = (3Ca)^{1/3} cot [alpha] where Ca is the capillary number and [alpha] is the inclination angle. Variation of D leads to changes in the wavelike properties of the instabilities, allowing us to observe traveling wave behavior, mixed waves, and waves resembling solitary ones. The study is …
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Computational Modeling of Droplet Impact Dynamics on Solid Substrates
… angle evolution based on the surface tension and capillary number. Preliminary validation performed on the model proves its effectiveness in accurately simulating the impact behavior when compared to the literature, where the spread diameter and height agree well with experiments. The validated …
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Experimental and numerical study of temperature-actuated droplets within microfluidics
… emulsion demonstrate the significance of capillary number Ca and fluids flow rate ratios �� on the droplet size and the transformation from squeezing into dripping or jetting regimes. The findings of this work assist the future works of performance optimization of on-chip DNA amplification …
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Tri-helical direct gravure coating
… by the depth of the tri-helical grooves and the capillary number. Experiments show that as the web-to-roll speed ratio is increased, so too is fluid pickout from the grooves, although the coated film thickness may decrease. A key feature of the present investigation is the formulation of a novel …
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Direct simulations of cells motions and deformations in flow
… moves away from the wall increases when the capillary number is increased, and decreases with increasing Reynolds number. The former suggests that the adhesion tendency of a leukocyte increases as its cortical tension is reduced. The distance traveled by a leukocyte before all bonds are …
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