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Showing 1 to 20 of 32 for “"Viscosity Ratio"”.
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Improving Impact Properties of Novatein through Polymer Blending and Reactive Extrusion
… these were, the choice of polymer, composition, viscosity ratio, interfacial tension and chemical interactions. Novatein was blended with either elastomeric core-shell particles, polyethylene (PE), or biodegradable polybutylene adipate-co-terephthalate (PBAT) using twin-screw extrusion to allow …
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Pore-scale dynamics of immiscible two-phase flow on porous and fractured media
… and storage, and enhanced oil recovery (EOR) operations. It has the potential to transform our understanding of multiphase flow processes, to improve oil and gas recovery efficiency, and to facilitate safe carbon dioxide storage. However, the modelled porespace geometry is naturally complex for …
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Simulation of viscous fingering during miscible displacement in nonuniform porous media
… parameters. These parameters are the viscosity ratio, the aspect ratio (ratio of longitudinal to transverse dimension), Peclet numbers for molecular, longitudinal and transverse dispersion and the gravity number. To study the effect of the structure of the porous medium, simulations …
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Thermoplastic xylan derivatives and related blends
… than 0.5 degree of substitution, with melt viscosity decreasing as the degree of substitution increased. The influence of viscosity ratio and composition on the texture of melt-blends of hydroxypropyl cellulose and polystyrene was studied for viscosity ratios of 0.08 to 0.55. Blends were …
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Investigation of mixing in the melting regime during polymer compounding
… component. A low solid modulus and a low melt viscosity are shown to favor the formation of the continuous phase by the minor component. Polycaprolactone/polyethylene. polystyrene/polyethylene. polycarbonate/ polyethylene, poly(ethylene-co-cyclohexane dimethylene terephthalate)/ polyethylene. …
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Mass transfer from spherical gas bubbles and liquid droplets moving through power-law fluids in the laminar flow regime
… of the Peclet number, power-law index, and a viscosity ratio parameter. The Hirose and Moo-Young relation is shown to be a limiting case of this solution. Mass transfer rates increase as the fluids become more pseudoplastic and/or the continuous phase consistency index increases, all other …
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Large Scale Hydrodynamic Simulations of Emulsions and Foams
… the work of Metsi, this study considers non-unit viscosity ratio for large scale monodisperse systems, higher dispersed phase volume fractions, and tighter simulation error tolerance. Zinchenko and Davis performed three-dimensional at volume fractions up to 55%. Owing to this limitation, their …
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Manufacture and Characterization of Micro-/Nano-fibrillated Composites and their Applications
… composites (M/NFC) are a new generation of composites containing well-dispersed, high aspect ratio polymeric fibrils. The novel composites have shown great promise as next-generation materials for construction, gas barrier packaging, and foaming applications. However, it is still …
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ΣΥΝΕΝΩΣΗ ΓΑΓΓΛΙΩΝ ΠΕΤΡΕΛΑΙΟΥ ΚΑΤΑ ΤΗΝ ΑΜΙΓΗ ΜΙΚΡΟΕΚΤΟΠΙΣΗ ΜΕΣΑ ΣΕ ΠΟΡΩΔΗ ΠΕΤΡΩΜΑΤΑ
… BETWEEN THE PROCESS OF OIL GANGLION DETERIORATION THROUGH BREAKUP AND STRANDING, ON THE ONE HAND, AND THE PROCESS OF OIL GANGLION COLLISION AND COALESCENCE, ON THE OTHER IF COMPUTER-AIDED SIMULATOR IS DEVELOPED, WHICH IS CAPABLE OF PREDICTING THE FATE OF OIL GANGLIA MOVING THROUGH WATER-WET …
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Numerical simulations that characterize the effects of surfactant on droplets in shear flow
… utilizing the code SURFER++ with the incorporation of an insoluble surfactant in the VOF scheme were conducted to characterize the effects of surfactant on a drop in shear flow. The drop is suspended in a matrix liquid. A parameter called reduction, which specifically relates to a percentage …
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Implementation of the phase field method with the Immersed Boundary Method for application to wave energy converters
… complicated by the 1:1000 density and 1:100 viscosity ratio between the two fluids. For this purpose, a phase field method is chosen for its ease of implementation and proven boundedness and conservativeness properties. Extensive validation and verification using standard test cases, such as …
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Droplet coalescence in the shear flow of model emulsions
… have been well researched for single drops, migration occurs only for concentrated emulsions. In this study, dilute emulsions of silicone oil and castor oil were employed to observe drop coalescence in the absence of drop breakup; flow fields utilized were Poiseuille flow through a tube and …
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Fluids Viscosity Effect on Non-Isothermal Buoyancy-Driven Exchange Flow in Inclined Pipes
… and diffusion. The rate of fluids interpenetration was measured showing an asymmetry from the observed non-isothermal results. The heavy cold finger advances at a faster rate compared to the light hot fluid finger. This phenomenon was quantified for the full range of inclination angles and …
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Displacement of Fluid Droplets From Solid Surfaces
… This problem has application in coating operations, enhanced oil recovery and vapor condensation. 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 …
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Pore-scale Study of Flow and Transport in Energy Georeservoirs
… from a partial-monolayer proppant concentration to a multilayer proppant concentration. The potential effects of mixed proppants of different sizes and types on the fracture conductivity were also investigated. The simulation results demonstrate that a proppant pack with a smaller diameter …
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A pair of immiscible ternary liquids with matchable refractive indexes over a wide range of density and viscosity ratios
… similarity also requires that the density ratio of the two surrogate fluids, as well as their ratio of viscosities, match the corresponding ratios in the original fluid pair of interest. Here, we show how that matching can be accomplished, using two ternary liquids, for which adjustment of …
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Multiphase Flow Dynamics in Confined Domains—A DNS Study of Bubbly, Thermal and Riblet-Induced Turbulence
… systematically studying three canonical configurations—liquid–liquid emulsions in Rayleigh–Bénard convection, buoyancy-driven bubbly flows in vertical channels, and channel flows over riblet-structured walls—this work advances the physical understanding of multi-physics interactions across a …
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Instability and Transition to Turbulence in Complex Viscoelastic Flows Overlying Porous Surfaces
… (WWWW), permeability parameter (αα), and solvent viscosity ratio (ββ). The analysis reveals a transition from viscoelastic Tollmien--Schlichting (TS)-type modes at low WWWW to a distinct elastic wall mode (EWM) localized near the fluid-porous interfaces at low RRRR. This EWM instability is …
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Effects of the Non-Newtonian Rheology on the Fluid-Structure Interactions in Biological Flows
… bending stiffness and the internal-to-external viscosity ratio may influence the behaviours of a capsule in a Newtonian shear flow. In addition, the capsules in viscoelastic shear flows are found to experience smaller deformations at lower Weissenberg numbers (Wi) and continuous increasing …
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Stability, transport and applications of polyaphrons in porous media
… polyaphrons can be destabilized by a low concentration of Al3+ or Ca2+ in the continuous phase while the cations have a stabilizing effect at high concentrations. Our results suggest that upon dilution polyaphrons may experience a structure transition, i.e. from bilayer structure to mixed …
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