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Journal articles on the topic 'Fluids near interfaces'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Daher, Ali, Amine Ammar, and Abbas Hijazi. "Nanoparticles migration near liquid-liquid interfaces using diffuse interface model." Engineering Computations 36, no. 3 (2019): 1036–54. http://dx.doi.org/10.1108/ec-03-2018-0153.

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Purpose The purpose of this paper is to develop a numerical model for the simulation of the dynamics of nanoparticles (NPs) at liquid–liquid interfaces. Two cases have been studied, NPs smaller than the interfacial thickness, and NPs greater than the interfacial thickness. Design/methodology/approach The model is based on the molecular dynamics (MD) simulation in addition to phase field (PF) method, through which the discrete model of particles motion is superimposed on the continuum model of fluids which is a new ide a in numerical modeling. The liquid–liquid interface is modeled using the di

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2

Gouin, Henri, and Pierre Seppecher. "Temperature profile in a liquid–vapour interface near the critical point." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2204 (2017): 20170229. http://dx.doi.org/10.1098/rspa.2017.0229.

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Thanks to an expansion with respect to densities of energy, mass and entropy, we discuss the concept of thermocapillary fluid for inhomogeneous fluids. The non-convex state law valid for homogeneous fluids is modified by adding terms taking account of the gradients of these densities. This seems more realistic than Cahn and Hilliard’s model which uses a density expansion in mass-density gradient only. Indeed, through liquid–vapour interfaces, realistic potentials in molecular theories show that entropy density and temperature do not vary with the mass density as it would do in bulk phases. In

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Daher, Ali, Amine Ammar, Abbas Hijazi, and Lazhar Benyahia. "Effect of Shear Flow on Nanoparticles Migration near Liquid Interfaces." Entropy 23, no. 9 (2021): 1143. http://dx.doi.org/10.3390/e23091143.

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The effect of shear flow on spherical nanoparticles (NPs) migration near a liquid–liquid interface is studied by numerical simulation. We have implemented a compact model through which we use the diffuse interface method for modeling the two fluids and the molecular dynamics method for the simulation of the motion of NPs. Two different cases regarding the state of the two fluids when introducing the NPs are investigated. First, we introduce the NPs randomly into the medium of the two immiscible liquids that are already separated, and the interface is formed between them. For this case, it is s

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Steytler, David C. "Microemulsions in near-critical fluids." Current Opinion in Colloid & Interface Science 1, no. 2 (1996): 236–40. http://dx.doi.org/10.1016/s1359-0294(96)80009-4.

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Scholz, Christian, Anton Ldov, Thorsten Pöschel, Michael Engel, and Hartmut Löwen. "Surfactants and rotelles in active chiral fluids." Science Advances 7, no. 16 (2021): eabf8998. http://dx.doi.org/10.1126/sciadv.abf8998.

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Surfactant molecules migrate to interfaces, reduce interfacial tension, and form micelles. All of these behaviors occur at or near equilibrium. Here, we describe active analogs of surfactants that operate far from equilibrium in active chiral fluids. Unlike molecular surfactants, the amphiphilic character of surfactants in active chiral fluids is a consequence of their activity. Our fluid of choice is a mixture of spinners that demixes into left-handed and right-handed chiral fluid domains. We realize spinners in experiment with three-dimensionally printed vibrots. Vibrot surfactants are chain

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Braithwaite, Gavin J. C., and Gareth H. McKinley. "Microrheometry for Studying the Rheology and Dynamics of Polymers Near Interfaces." Applied Rheology 9, no. 1 (1999): 27–33. http://dx.doi.org/10.1515/arh-2009-0003.

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Abstract The design of an instrument capable of opto-mechanical studies of the rheology of viscoelastic polymeric fluids near solid interfaces is described. The instrument probes the ‘meso’-scale (length scales of 0 (μm)) and bridges the gap between molecular-scale devices such as the Surface Force Apparatus (SFA) and conventional rheometers. The high viscosity materials and intermediate length scales probed with the current device are of direct relevance to industrial coating and thin film polymer processing operations, in addition to fundamental investigations of slip and interfacial instabi

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7

Schoen, M., and F. Porcheron. "Collective dynamics near a phase transition in confined fluids." European Physical Journal E 12, S1 (2003): 5–7. http://dx.doi.org/10.1140/epjed/e2003-01-002-8.

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8

HUNT, J. C. R., D. D. STRETCH, and S. E. BELCHER. "Viscous coupling of shear-free turbulence across nearly flat fluid interfaces." Journal of Fluid Mechanics 671 (February 24, 2011): 96–120. http://dx.doi.org/10.1017/s0022112010005525.

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The interactions between shear-free turbulence in two regions (denoted as + and − on either side of a nearly flat horizontal interface are shown here to be controlled by several mechanisms, which depend on the magnitudes of the ratios of the densities, ρ+/ρ−, and kinematic viscosities of the fluids, μ+/μ−, and the root mean square (r.m.s.) velocities of the turbulence, u0+/u0−, above and below the interface. This study focuses on gas–liquid interfaces so that ρ+/ρ− ≪ 1 and also on where turbulence is generated either above or below the interface so that u0+/u0− is either very large or very sma

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9

Srivastava, S., P. Perlekar, L. Biferale, M. Sbragaglia, J. H. M. ten Thije Boonkkamp, and F. Toschi. "A Study of Fluid Interfaces and Moving Contact Lines Using the Lattice Boltzmann Method." Communications in Computational Physics 13, no. 3 (2013): 725–40. http://dx.doi.org/10.4208/cicp.411011.310112s.

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AbstractWe study the static and dynamical behavior of the contact line between two fluids and a solid plate by means of the Lattice Boltzmann method (LBM). The different fluid phases and their contact with the plate are simulated by means of standard Shan-Chen models. We investigate different regimes and compare the multicomponent vs. the multiphase LBM models near the contact line. A static interface profile is attained with the multiphase model just by balancing the hydrostatic pressure (due to gravity) with a pressure jump at the bottom. In order to study the same problem with the multicomp

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10

Castelo, Antonio, Alexandre M. Afonso, and Wesley De Souza Bezerra. "A Hierarchical Grid Solver for Simulation of Flows of Complex Fluids." Polymers 13, no. 18 (2021): 3168. http://dx.doi.org/10.3390/polym13183168.

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Tree-based grids bring the advantage of using fast Cartesian discretizations, such as finite differences, and the flexibility and accuracy of local mesh refinement. The main challenge is how to adapt the discretization stencil near the interfaces between grid elements of different sizes, which is usually solved by local high-order geometrical interpolations. Most methods usually avoid this by limiting the mesh configuration (usually to graded quadtree/octree grids), reducing the number of cases to be treated locally. In this work, we employ a moving least squares meshless interpolation techniq

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11

Gajrani, Kishor Kumar, Rokkham Pavan Kumar Reddy та Mamilla Ravi Sankar. "Tribo-mechanical and surface morphological comparison of untextured, mechanical micro-textured (MμT), and coated-MμT cutting tools during machining". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, № 1 (2018): 95–111. http://dx.doi.org/10.1177/1350650118764975.

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In machining process, cutting fluids are used to reduce the tool–chip interface temperature and forces, but it causes various health hazards to machine operators as well as increases the associated costs. To improve machining sustainability, researchers are trying to reduce or eliminate cutting fluid usage during machining by various other techniques (development of better tool material, bio-cutting fluids, use of vegetable oils, near-dry machining, process optimization, surface coatings, etc). In recent years, several researchers applied controlled surface modification (surface texturing/engi

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12

Yang, Yang, Leping Zhou, Xiaoze Du, and Yongping Yang. "Fluid Flow and Thin-Film Evolution near the Triple Line during Droplet Evaporation of Self-Rewetting Fluids." Langmuir 34, no. 13 (2018): 3853–63. http://dx.doi.org/10.1021/acs.langmuir.8b00170.

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13

Milewska-Duda, Janina, and Jan Tadeusz Duda. "High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO2 and CH4 Adsorption." Adsorption Science & Technology 25, no. 8 (2007): 543–59. http://dx.doi.org/10.1260/0263-6174.25.8.543.

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This paper presents a set of high-accuracy formulae enabling the evaluation of the compression factor, activity and cohesion energy of fluids at near-critical and super-critical temperatures, with reduced molar volumes ranging from 0.4. Such data are necessary in BET-like theoretical modelling of adsorption process. The proposed fluid state equation (PVT relationship) combines a theoretical description of the fluid entropy (based on a hard-sphere model) with cohesion energy relationships obtained via high-accuracy approximations of universal compression factor data and vapour-liquid equilibria

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14

Bonhomme, Romain, Jacques Magnaudet, Fabien Duval, and Bruno Piar. "Inertial dynamics of air bubbles crossing a horizontal fluid–fluid interface." Journal of Fluid Mechanics 707 (July 13, 2012): 405–43. http://dx.doi.org/10.1017/jfm.2012.288.

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AbstractThe dynamics of isolated air bubbles crossing the horizontal interface separating two Newtonian immiscible liquids initially at rest are studied both experimentally and computationally. High-speed video imaging is used to obtain a detailed evolution of the various interfaces involved in the system. The size of the bubbles and the viscosity contrast between the two liquids are varied by more than one and four orders of magnitude, respectively, making it possible to obtain bubble shapes ranging from spherical to toroidal. A variety of flow regimes is observed, including that of small bub

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15

Sawada, Ikuo, Hiroyuki Tanaka, and Masahiro Tanaka. "Status of Computational Fluid Dynamics and Its Application to Materials Manufacturing." MRS Bulletin 19, no. 1 (1994): 14–19. http://dx.doi.org/10.1557/s088376940003880x.

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Computational fluid dynamics was born principally in the aerospace field as a method for fluid flow and heat transfer research methods following experimental and analytical approaches. Along with progress in the cost performance of computers, computational fluid dynamics is now establishing itself as a tool to improve production processes and product quality in the steel, nonferrous metals, glass, plastics, and composite materials industries.Materials manufacturers use computational fluid dynamics for diverse purposes:1. Reduction in experimental conditions and costs;2. Detailed analysis of me

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16

De Bruyne, Frank A., and D. B. Bogy. "Numerical Simulation of the Lubrication of the Head-Disk Interface Using a Non-Newtonian Fluid." Journal of Tribology 116, no. 3 (1994): 541–48. http://dx.doi.org/10.1115/1.2928878.

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The prospect of contact and near-contact recording in magnetic hard disk files naturally leads to reduced flying heights of the read-write head over the rigid disk. To avoid dry contact at these low head-to-disk spacings, a lubricant should be used to minimize wear and maximize reliability. Since fluids generally have a much greater viscosity than air and very large shear rates develop under the slider, it is believed that a fully flooded interface can only be practically possible if the fluid possesses a non-Newtonian character with a significant amount of shear-thinning. In this paper, we pr

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17

Tovbin, Yu K., A. B. Rabinovich, and D. V. Yeremich. "Kinetic Coefficients for Mixed Adsorbate Fluids in Narrow Pores." Adsorption Science & Technology 25, no. 6 (2007): 395–415. http://dx.doi.org/10.1260/026361707783908328.

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The kinetic coefficients (trace diffusion, mutual diffusion and shear viscosity) of molecules in slit-like and sphero-cylindrical mesoporous systems were studied in terms of the modified lattice-gas model (LGM). The LGM equations were derived for molecules of the mixture having a spherical shape and similar size. A new equation for the velocity of the thermal molecule was used. The theory takes the change in the mechanism of particle migration in different phases into account, viz. from pair collisions for the gas to the overcoming of the activation barrier by thermofluctuation for dense phase

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18

D. Stepanov, A. "Statistical Method for Tracing Hydraulic Fracture Front Without Evaluation of the Normal." International Journal of Engineering & Technology 7, no. 4.26 (2018): 274. http://dx.doi.org/10.14419/ijet.v7i4.26.27936.

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In numerical simulation of hydraulic fracture propagation, tangent component of the fluid velocity generally considered to be neglected near the crack front. Then Reynolds transport theorem yields that the limit of the particle velocity coincides with the vector of the front propagation speed. We use this fact in combination with the Poiseuille-type equation, which implies that the particle velocity is always collinear to pressure gradient. We show that this specific feature of the hydraulic fracture problem may serve to simplify tracing the front propagation. The latter may be traced without

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19

XU, XINPENG, and TIEZHENG QIAN. "EVAPORATIVE DROPLETS IN ONE-COMPONENT FLUIDS DRIVEN BY THERMAL GRADIENTS ON SOLID SUBSTRATES." International Journal of Modern Physics B 27, no. 07 (2013): 1361008. http://dx.doi.org/10.1142/s0217979213610080.

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A continuum hydrodynamic model is presented for one-component liquid–gas flows on nonisothermal solid substrates. Numerical simulations are carried out for evaporative droplets moving on substrates with thermal gradients. For droplets in one-component fluids on heated/cooled substrates, the free liquid–gas interfaces are nearly isothermal. Consequently, a thermal singularity occurs at the contact line while the Marangoni effect due to interfacial temperature variation is suppressed. Through evaporation/condensation near the contact line, the thermal singularity makes the contact angle increase

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20

SHIKHMURZAEV, YULII D. "Moving contact lines in liquid/liquid/solid systems." Journal of Fluid Mechanics 334 (March 10, 1997): 211–49. http://dx.doi.org/10.1017/s0022112096004569.

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A general mathematical model which describes the motion of an interface between immiscible viscous fluids along a smooth homogeneous solid surface is examined in the case of small capillary and Reynolds numbers. The model stems from a conclusion that the Young equation, σ1 cos θ = σ2 − σ3, which expresses the balance of tangential projection of the forces acting on the three-phase contact line in terms of the surface tensions σi and the contact angle θ, together with the well-established experimental fact that the dynamic contact angle deviates from the static one, imply that the surface tensi

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21

Rečnik, Aleksander, Janez Zavašnik, Lei Jin, Andrea Čobić, and Nina Daneu. "On the origin of 'iron-cross' twins of pyrite from Mt. Katarina, Slovenia." Mineralogical Magazine 80, no. 6 (2016): 937–48. http://dx.doi.org/10.1180/minmag.2016.080.073.

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AbstractIron-cross twins of pyrite are well known among mineralogists, however it is quite surprising that the conditions of their formation remain unexplored. To address this question we studied pyrite twins from the Upper Permian silts of Mt. Katarina near Ljubljana (Slovenia), which represent one of the most typical geological environments for twinned pyrite. Mineralization of pyrite starts with a reduction of the primary red-coloured hematite-rich sediment by sulfide-rich fluids that penetrated the strata. A short period of magnetite crystallization is observed prior to pyrite crystallizat

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22

Foster, Douglas J., Robert G. Keys, and F. David Lane. "Interpretation of AVO anomalies." GEOPHYSICS 75, no. 5 (2010): 75A3–75A13. http://dx.doi.org/10.1190/1.3467825.

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We investigate the effects of changes in rock and fluid properties on amplitude-variation-with-offset (AVO) responses. In the slope-intercept domain, reflections from wet sands and shales fall on or near a trend that we call the fluid line. Reflections from the top of sands containing gas or light hydrocarbons fall on a trend approximately parallel to the fluid line; reflections from the base of gas sands fall on a parallel trend on the opposing side of the fluid line. The polarity standard of the seismic data dictates whether these reflections from the top of hydrocarbon-bearing sands are bel

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23

Burguete, M. Isabel, Eduardo García-Verdugo, and Santiago V. Luis. "Efficient and selective chemical transformations under flow conditions: The combination of supported catalysts and supercritical fluids." Beilstein Journal of Organic Chemistry 7 (September 30, 2011): 1347–59. http://dx.doi.org/10.3762/bjoc.7.159.

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This paper reviews the current trends in the combined use of supported catalytic systems, either on solid supports or in liquid phases and supercritical fluids (scFs), to develop selective and enantioselective chemical transformations under continuous and semi-continuous flow conditions. The results presented have been selected to highlight how the combined use of those two elements can contribute to: (i) Significant improvements in productivity as a result of the enhanced diffusion of substrates and reagents through the interfaces favored by the scF phase; (ii) the long term stability of the

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24

Luo, Xisheng, Ping Dong, Ting Si, and Zhigang Zhai. "The Richtmyer–Meshkov instability of a ‘V’ shaped air/ interface." Journal of Fluid Mechanics 802 (August 3, 2016): 186–202. http://dx.doi.org/10.1017/jfm.2016.476.

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The Richtmyer–Meshkov instability on a ‘V’ shaped air/SF$_{6}$ gaseous interface is experimentally studied in a shock tube. By the soap film technique, a discontinuous interface without supporting mesh is formed so that the initial conditions of the interface can be accurately controlled. Five ‘V’ shaped air/$\text{SF}_{6}$ interfaces with different vertex angles ($60^{\circ }$, $90^{\circ }$, $120^{\circ }$, $140^{\circ }$ and $160^{\circ }$) are created where the ratio of the initial interface amplitude to the wavelength varies to highlight the effects of initial condition on the flow charac

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Yu, You, Joanna Nassar, Changhao Xu, et al. "Biofuel-powered soft electronic skin with multiplexed and wireless sensing for human-machine interfaces." Science Robotics 5, no. 41 (2020): eaaz7946. http://dx.doi.org/10.1126/scirobotics.aaz7946.

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Existing electronic skin (e-skin) sensing platforms are equipped to monitor physical parameters using power from batteries or near-field communication. For e-skins to be applied in the next generation of robotics and medical devices, they must operate wirelessly and be self-powered. However, despite recent efforts to harvest energy from the human body, self-powered e-skin with the ability to perform biosensing with Bluetooth communication are limited because of the lack of a continuous energy source and limited power efficiency. Here, we report a flexible and fully perspiration-powered integra

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KOROBKIN, A. A., A. S. ELLIS, and F. T. SMITH. "Trapping of air in impact between a body and shallow water." Journal of Fluid Mechanics 611 (September 25, 2008): 365–94. http://dx.doi.org/10.1017/s0022112008002899.

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Near-impact behaviour is investigated for a solid body approaching another solid body with two immiscible incompressible viscous fluids occupying the gap in between. The fluids have viscosity and density ratios which are extreme, the most notable combination being water and air, such that either or both of the bodies are covered by a thin film of water. Air–water interaction and the commonly observed phenomenon of air trapping are of concern in the presence of the two or three thin layers and one or two interfaces. The subcritical regime is of most practical significance here and it leads phys

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27

Lakehal, D., M. Fulgosi, G. Yadigaroglu, and S. Banerjee. "Direct Numerical Simulation of Turbulent Heat Transfer Across a Mobile, Sheared Gas-Liquid Interface." Journal of Heat Transfer 125, no. 6 (2003): 1129–39. http://dx.doi.org/10.1115/1.1621891.

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The impact of interfacial dynamics on turbulent heat transfer at a deformable, sheared gas-liquid interface is studied using Direct Numerical Simulation (DNS). The flow system comprises a gas and a liquid phase flowing in opposite directions. The governing equations for the two fluids are alternately solved in separate domains and then coupled at the interface by imposing continuity of velocity and stress. The deformations of the interface fall in the range of capillary waves of waveslope ak=0.01 (wave amplitude a times wavenumber k), and very small phase speed-to-friction velocity ratio, c/u*

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AFKHAMI, S., A. J. TYLER, Y. RENARDY, et al. "Deformation of a hydrophobic ferrofluid droplet suspended in a viscous medium under uniform magnetic fields." Journal of Fluid Mechanics 663 (September 8, 2010): 358–84. http://dx.doi.org/10.1017/s0022112010003551.

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The effect of applied magnetic fields on the deformation of a biocompatible hydrophobic ferrofluid drop suspended in a viscous medium is investigated numerically and compared with experimental data. A numerical formulation for the time-dependent simulation of magnetohydrodynamics of two immiscible non-conducting fluids is used with a volume-of-fluid scheme for fully deformable interfaces. Analytical formulae for ellipsoidal drops and near-spheroidal drops are reviewed and developed for code validation. At low magnetic fields, both the experimental and numerical results follow the asymptotic sm

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29

Carnahan, Norman F., Lirio Quintero, David M. Pfund, et al. "A small angle x-ray scattering study of the effect of pressure on the aggregation of asphaltene fractions in petroleum fluids under near-critical solvent conditions." Langmuir 9, no. 8 (1993): 2035–44. http://dx.doi.org/10.1021/la00032a023.

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30

Mani, Ali, and Karen May Wang. "Electroconvection Near Electrochemical Interfaces: Experiments, Modeling, and Computation." Annual Review of Fluid Mechanics 52, no. 1 (2020): 509–29. http://dx.doi.org/10.1146/annurev-fluid-010719-060358.

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Many electrochemical and microfluidic systems involve voltage-driven transport of ions from a fluid electrolyte toward an ion-selective interface. These systems are governed by intimate coupling between fluid flow, mass transport, and electrostatic effects. When counterions are driven toward a selective interface, this coupling is shown to lead to a hydrodynamic instability called electroconvection. This phenomenon is an example of electrochemistry inducing flow, which in turn affects the transport and ohmic resistance of the bulk electrolyte. These effects have implications in a wide range of

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31

Srinivas, J., J. V. Ramana Murthy, and Ali J. Chamkha. "Analysis of entropy generation in an inclined channel flow containing two immiscible micropolar fluids using HAM." International Journal of Numerical Methods for Heat & Fluid Flow 26, no. 3/4 (2016): 1027–49. http://dx.doi.org/10.1108/hff-09-2015-0354.

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Purpose – The purpose of this paper is to examine the flow, heat transfer and entropy generation characteristics for an inclined channel of two immiscible micropolar fluids. Design/methodology/approach – The flow region consists of two zones, the flow of the heavier fluid taking place in the lower zone. The flow is assumed to be governed by Eringen’s micropolar fluid flow equation. The resulting governing equations are then solved using the homotopy analysis method. Findings – The following findings are concluded: first, the entropy generation rate is more near the plates in both the zones as

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32

Wang, G. M., R. Prabhakar, Y. X. Gao, and E. M. Sevick. "Micro-rheology near fluid interfaces." Journal of Optics 13, no. 4 (2011): 044009. http://dx.doi.org/10.1088/2040-8978/13/4/044009.

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COATANHAY, ARNAUD, and JEAN-MARC CONOIR. "SCATTERING NEAR A PLANE INTERFACE USING A GENERALIZED METHOD OF IMAGES APPROACH." Journal of Computational Acoustics 12, no. 02 (2004): 233–56. http://dx.doi.org/10.1142/s0218396x04002250.

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A new method for predicting the scattered acoustic field due to a plane wave incident upon an infinitely long cylinder lying near an penetrable plane interface is presented. The method generalizes the method of images which is restricted to rigid and soft plane interfaces. Validity domains, physical interpretations, simulations and numerical results are described for sedimentary medium-fluid plane interfaces. And, they are well compared with high frequency asymptotic results based on the Geometrical Theory of Diffraction(G.T.D.).

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Jasti, Venkata K., and C. Fred Higgs. "A Lattice-Based Cellular Automata Modeling Approach for Granular Flow Lubrication." Journal of Tribology 128, no. 2 (2005): 358–64. http://dx.doi.org/10.1115/1.2164466.

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Liquid lubricants break down at extreme temperatures and promote stiction in micro-/nanoscale environments. Consequently, using flows of solid granular particles as a “dry” lubrication mechanism in sliding contacts was proposed because of their ability to carry loads and accommodate surface velocities. Granular flows are highly complex flows that in many ways act similar to fluids, yet are difficult to predict because they are not well understood. Granular flows are composed of discrete particles that display liquid and solid lubricant behavior with time. This work describes the usefulness of

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35

TAGHAVI, S. M., T. SEON, D. M. MARTINEZ, and I. A. FRIGAARD. "Buoyancy-dominated displacement flows in near-horizontal channels: the viscous limit." Journal of Fluid Mechanics 639 (October 16, 2009): 1–35. http://dx.doi.org/10.1017/s0022112009990620.

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We consider the viscous limit of a plane channel miscible displacement flow of two generalized Newtonian fluids when buoyancy is significant. The channel is inclined close to horizontal. A lubrication/thin-film approximation is used to simplify the governing equations and a semi-analytical solution is found for the flux functions. We show that there are no steady travelling wave solutions to the interface propagation equation. At short times the diffusive effects of the interface slope are dominant and there is a flow reversal, relative to the mean flow. We are able to find a short-time simila

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Manabe, Junichi, Toshihiro Omori, Yohsuke Imai, and Takuji Ishikawa. "PS1-10 Swimming behavior of a model ciliate near a fluid-air or a fluid-solid interface(PS1: Poster Short Presentation I,Poster Session)." Proceedings of the Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2015.8 (2015): 231. http://dx.doi.org/10.1299/jsmeapbio.2015.8.231.

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Pouliquen, O., J. M. Chomaz, and P. Huerre. "Propagating Holmboe waves at the interface between two immiscible fluids." Journal of Fluid Mechanics 266 (May 10, 1994): 277–302. http://dx.doi.org/10.1017/s002211209400100x.

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The instability of the surface of discontinuity separating two streams of immiscible constant-density fluids is studied experimentally and theoretically near onset when surface tension effects are significant. Following Thorpe's original idea, a tube filled with two immiscible fluids is tilted at an angle and returned to its horizontal position to produce a nearly constant velocity difference between both streams that can be varied continuously across threshold. In order to control the wavenumber near onset, the flow is spatially forced by periodically distributing small obstacles on the upper

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Courrech du Pont, Sylvain, and Jens Eggers. "Fluid interfaces with very sharp tips in viscous flow." Proceedings of the National Academy of Sciences 117, no. 51 (2020): 32238–43. http://dx.doi.org/10.1073/pnas.2019287117.

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When a fluid interface is subjected to a strong viscous flow, it tends to develop near-conical ends with pointed tips so sharp that their radius of curvature is undetectable. In microfluidic applications, tips can be made to eject fine jets, from which micrometer-sized drops can be produced. Here we show theoretically that the opening angle of the conical interface varies on a logarithmic scale as a function of the distance from the tip, owing to nonlocal coupling between the tip and the external flow. Using this insight we are able to show that the tip curvature grows like the exponential of

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POZRIKIDIS, C. "Particle motion near and inside an interface." Journal of Fluid Mechanics 575 (March 2007): 333–57. http://dx.doi.org/10.1017/s0022112006004046.

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The motion of a spherical particle near the interface between two immiscible viscous fluids undergoing simple shear flow is considered in the limit of small Reynolds and capillary numbers where the interface exhibits negligible deformation. Taking advantage of the rotational symmetry of the boundaries of the flow with respect to the axis that is normal to the interface and passes through the particle centre, the problem is formulated as a system of one-dimensional integral equations for the first Fourier coefficients of the unknown components of the traction and velocity along the particle and

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Rohatgi, Pratik, Nicholas B. Langhals, Daryl R. Kipke, and Parag G. Patil. "In vivo performance of a microelectrode neural probe with integrated drug delivery." Neurosurgical Focus 27, no. 1 (2009): E8. http://dx.doi.org/10.3171/2009.4.focus0983.

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Object The availability of sophisticated neural probes is a key prerequisite in the development of future brain-machine interfaces (BMIs). In this study, the authors developed and validated a neural probe design capable of simultaneous drug delivery and electrophysiology recordings in vivo. Focal drug delivery promises to extend dramatically the recording lives of neural probes, a limiting factor to clinical adoption of BMI technology. Methods To form the multifunctional neural probe, the authors affixed a 16-channel microfabricated silicon electrode array to a fused silica catheter. Three exp

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UNGARISH, M., and J. MANG. "The flow field and bare-spot formation in spin-up from rest of a two-layer fluid about a vertical axis." Journal of Fluid Mechanics 474 (January 10, 2003): 117–45. http://dx.doi.org/10.1017/s0022112002002604.

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The spin-up from rest of a two-layer fluid with a free surface in a cylindrical container rotating about a vertical axis is investigated for small Ekman numbers. Numerical results from the axisymmetric Navier–Stokes equations, supported by comparisons with improved boundary-layer approximations, show that the Ekman-type layer on the bottom pushes the dense fluid of the lower layer to the periphery, and consequently the interface between the layers curves upward near the sidewall and descends near the centre. When the lower layer of fluid is sufficiently thin a bare spot appears at the bottom,

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Arenas, Isnardo, Edgardo García, Matthew K. Fu, Paolo Orlandi, Marcus Hultmark, and Stefano Leonardi. "Comparison between super-hydrophobic, liquid infused and rough surfaces: a direct numerical simulation study." Journal of Fluid Mechanics 869 (April 29, 2019): 500–525. http://dx.doi.org/10.1017/jfm.2019.222.

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Direct numerical simulations of two superposed fluids in a channel with a textured surface on the lower wall have been carried out. A parametric study varying the viscosity ratio between the two fluids has been performed to mimic both idealised super-hydrophobic and liquid-infused surfaces and assess its effect on the frictional, form and total drag for three different textured geometries: longitudinal square bars, transversal square bars and staggered cubes. The interface between the two fluids is assumed to be slippery in the streamwise and spanwise directions and not deformable in the verti

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Lefauve, Adrien, J. L. Partridge, Qi Zhou, S. B. Dalziel, C. P. Caulfield, and P. F. Linden. "The structure and origin of confined Holmboe waves." Journal of Fluid Mechanics 848 (June 5, 2018): 508–44. http://dx.doi.org/10.1017/jfm.2018.324.

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Finite-amplitude manifestations of stratified shear flow instabilities and their spatio-temporal coherent structures are believed to play an important role in turbulent geophysical flows. Such shear flows commonly have layers separated by sharp density interfaces, and are therefore susceptible to the so-called Holmboe instability, and its finite-amplitude manifestation, the Holmboe wave. In this paper, we describe and elucidate the origin of an apparently previously unreported long-lived coherent structure in a sustained stratified shear flow generated in the laboratory by exchange flow throug

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Tseng, Yu-Hau, and Andrea Prosperetti. "Local interfacial stability near a zero vorticity point." Journal of Fluid Mechanics 776 (June 30, 2015): 5–36. http://dx.doi.org/10.1017/jfm.2015.246.

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It is often observed that small drops or bubbles detach from the interface separating two co-flowing immiscible fluids. The size of these drops or bubbles can be orders of magnitude smaller than the length scales of the parent fluid mass. Examples are tip-streaming from drops or coaxial jets in microfluidics, selective withdrawal, ‘skirt’ formation around bubbles or drops, and others. It is argued that these phenomena are all reducible to a common instability that can occur due to a local convergence of streamlines in the neighbourhood of a zero-vorticity point or line on the interface. When s

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Fisher, Michael E., and Paul J. Upton. "Fluid interface tensions near critical end points." Physical Review Letters 65, no. 27 (1990): 3405–8. http://dx.doi.org/10.1103/physrevlett.65.3405.

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Yang, Seung-Man, and Won-Hi Hong. "Brownian diffusion near a plane fluid interface." Korean Journal of Chemical Engineering 4, no. 2 (1987): 187–93. http://dx.doi.org/10.1007/bf02697436.

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Diehl, Alexander, Cornel E. J. de Ronde, and Wolfgang Bach. "Subcritical Phase Separation and Occurrence of Deep-Seated Brines at the NW Caldera Vent Field, Brothers Volcano: Evidence from Fluid Inclusions in Hydrothermal Precipitates." Geofluids 2020 (September 16, 2020): 1–22. http://dx.doi.org/10.1155/2020/8868259.

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The northwestern caldera wall of Brothers volcano in the southern Kermadec arc features several clusters of hydrothermal venting in a large area that extends from near the caldera floor (~1700 mbsl) almost up to the crater rim (~1300 mbsl). Abundant black smoker-type hydrothermal chimneys and exposed stockwork mineralization in this area provide an excellent archive of hydrothermal processes that form seafloor massive sulfide deposits. Using sulfate precipitates from chimneys and stockwork recently recovered by remotely operated vehicles, we conducted fluid inclusion microthermometry and Sr is

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Yoon, Hyun-Sik, and Kyung-Min Park. "Behavior of the Free Surface of Two-Phase Fluid Flow Near the Taphole in a Tank." Symmetry 13, no. 5 (2021): 875. http://dx.doi.org/10.3390/sym13050875.

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The present study numerically investigated the deformation of the free-surface of two-phase fluid flow in a tank which is considered as a simplified blast furnace hearth. Actually, the fluids existing in a blast furnace hearth are gas, slag and hot metal from top to bottom. However, the present study considered only gas and cold molten iron in the tank. The porosity is considered as a substitute for void volume formed by the packed bed of the particles such as cokes. The single-phase flow and two-phase fluids flow without the porosity are analyzed for comparison. The porosity contributed the f

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Cortellessa, Gino, Fausto Arpino, Simona Di Fraia, and Mauro Scungio. "Two-phase explicit CBS procedure for compressible viscous flow transport in porous materials." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 2 (2018): 336–60. http://dx.doi.org/10.1108/hff-02-2017-0080.

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Purpose In this work, a new two-phase version of the finite element-based Artificial Compressibility (AC) Characteristic-Based Split (CBS) algorithm is developed and applied for the first time to heat and mass transfer phenomena in porous media with associated phase change. The purpose of this study is to provide an alternative for the theoretical analysis and numerical simulation of multiphase transport phenomena in porous media. Traditionally, the more complex Separate Flow Model was used in which the vapour and liquid phases were considered as distinct fluids and mathematically described by

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Kumar, Krishna, and Laurette S. Tuckerman. "Parametric instability of the interface between two fluids." Journal of Fluid Mechanics 279 (November 25, 1994): 49–68. http://dx.doi.org/10.1017/s0022112094003812.

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The flat interface between two fluids in a vertically vibrating vessel may be parametrically excited, leading to the generation of standing waves. The equations constituting the stability problem for the interface of two viscous fluids subjected to sinusoidal forcing are derived and a Floquet analysis is presented. The hydrodynamic system in the presence of viscosity cannot be reduced to a system of Mathieu equations with linear damping. For a given driving frequency, the instability occurs only for certain combinations of the wavelength and driving amplitude, leading to tongue-like stability

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