Article
Energy & Fuels
Gessica Palaoro, Diogo E. V. Andrade, Jonathan F. Galdino, Admilson T. Franco, Elessandre Alves, Alex Waldmann
Summary: Oil and gas exploration and production in high pressure and high temperature zones pose challenges for drilling fluid performance. This study investigates the rheological characterization of inverted emulsion drilling fluid under high pressure conditions, finding that pressure has a more significant impact on the solid regime.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Benjamin C. Munro, Simon B. Hall, Catherine P. Whitby
Summary: Emulsions flow and yield when subjected to sufficient stress, with the movement of the droplets dependent on the stability mechanism. Unlike surfactant-stabilized emulsions, where droplets move simultaneously, nanoparticles-stabilized emulsions exhibit a delay in droplet movement due to the formation of networks in the continuous phase. The disruption of these networks is necessary for droplet mobility. Through various experimental techniques, it was found that Pickering emulsions undergo two distinct processes during the transition from solid to fluid flow. The study also revealed evidence of structure recovery in emulsions during shear.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Mechanics
B. Calusi, A. Farina, L. Fusi, F. Rosso
Summary: In this study, the linear stability of a flow down an incline is investigated when the fluid is modeled as a regularized Bingham-like fluid. The theoretical analysis using the long-wave approximation method reveals the existence of a critical condition for the onset of instability, which depends on the tilt angle and rheological parameters. The comparison with experimental studies shows satisfactory results.
Article
Polymer Science
Cuong Mai Bui, Anh-Ngoc Tran Ho, Xuan Bao Nguyen
Summary: This study numerically investigates the flow behavior of polymers in a lid-driven cavity, inspired by the coating process, over a wide range of Oldroyd numbers (0 <= Od <= 50). The results show that the flow characteristics of polymers, such as velocity, viscosity, and vortex distributions, are significantly influenced by viscoplastic behaviors. Additionally, solid-like regions are observed in the flow patterns, and their size increases and tends to merge together as Od increases. The cavity width/aspect ratio and skewed angle also have significant impacts on the vortex structures and the formation of solid-like regions.
Article
Optics
Reuben R. W. Wang, John L. Bohn
Summary: In this study, we investigate the collective motion and damping of dipolar Fermi gases in the hydrodynamic regime. Through Monte Carlo simulations, we analyze the trajectories of collective oscillations, termed as weltering motions, in cross-dimensional rethermalization experiments and observe significant differences compared to dilute systems. These findings are explained by a semiempirical theory of viscous hydrodynamics, which provides simplified equations of motion that show good agreement with full numerical solutions by carefully considering the size and shape of the effective volume of the gas.
Article
Chemistry, Physical
N'dri Arthur Konan, Eilis Rosenbaum, Mehrdad Massoudi
Summary: This study numerically examines the dynamics of air bubbles in a column of cement slurry. The results show that the mean diameter and rise velocity of the bubbles decrease with the gas flow rate. The rising of the bubbles is controlled by breakup events and relatively weak path instabilities, independent of the gas flow rate. Additionally, the yielded region is larger for the Herschel-Bulkley model compared to the Bingham fluid model by approximately 10%.
Article
Polymer Science
N'dri Arthur Konan, Eilis Rosenbaum, Mehrdad Massoudi
Summary: In this study, the boundary-layer flow of a Herschel-Bulkley fluid due to a moving plate is investigated. Computational fluid dynamics and regularization methods are used to solve the governing equations numerically. The results show good agreement between simulations and experimental data, with accurate prediction of boundary layer thicknesses and strong sensitivities to the rheological properties of the fluid.
Article
Engineering, Mechanical
M. S. Aghighi, A. Ammar, H. Masoumi
Summary: This study investigates the double-diffusive natural convection of non-Newtonian Casson fluid in a square cavity and finds that yield stress plays a significant role in fluid behavior. The analysis of the governing parameters reveals that the Rayleigh number, yield number, buoyancy ratio number, and Lewis number have a significant impact on heat and mass transfer, the morphology of yielded/unyielded regions, and fluid flow.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Physical
Rashid Mahmood, Afraz Hussain Majeed, Qurrat ul Ain, Jan Awrejcewicz, Imran Siddique, Hasan Shahzad
Summary: In this study, an investigation is conducted on the flow of Bingham fluid in a channel-driven cavity with a square obstacle near the inlet. Three computational grids are created by altering the position of the obstacle. A finite element approach is used to approximate the solution, and hydrodynamic benchmark quantities such as drag and lift coefficients are evaluated.
Article
Energy & Fuels
Karoline Nobrega Celino, Elessandre Alves de Souza, Rosangela de Carvalho Balaban
Summary: The study explores the potential advantages of replacing saturated NaCl brine with glycerol in invert emulsion drilling fluid for ultra-deep waters. It shows that this substitution can maintain rheological properties, reduce interactions with salt and clay areas, and offer new possibilities for economic effectiveness in waste disposal. Compatibility with commercial additives and investigation of interactions with salt and clay plugs demonstrate immediate feasibility and potential benefits for this alternative composition.
Article
Pharmacology & Pharmacy
Ahmed S. M. Alenazi, Ibrahim M. El-Bagory, Alaa B. Yassin, Fars K. Alanazi, Ibrahim A. Alsarra, Nazrul Haq, Mohsen A. Bayomi, Faiyaz Shakeel
Summary: Peptides are unstable under drastic conditions, but using polymeric nanoparticles as carriers for peptides in pharmaceutical field is highly desirable due to their stability in biological environment. This study used double emulsion solvent evaporation technique to formulate nanoparticles as carriers for capreomycin sulfate (CMS) peptide. Optimization of formulation factors allowed the production of polymeric nanoparticles with small particle sizes and high entrapment efficiencies. In vitro drug release experiments showed that PLGA NPs exhibited slower release compared to chitosan NPs.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
O. M. Lavrenteva, I. Smagin, A. Nir
Summary: The sedimentation process of a deformable compound drop, consisting of a viscoplastic fluid shell and a viscous core, in an unbounded Newtonian medium is simulated using a boundary integral approach. The flow is approximated as quasi-stationary creeping flow, with the non-Newtonian stress treated as a source term. The study focuses on the dynamics of interface deformation and un-yielded zones inside the shell, and computations are performed for compound drops with different shell thickness and physical parameters.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2023)
Article
Physics, Condensed Matter
E. Tendong, T. Saha-Dasgupta, J. Chakrabarti
Summary: The viscoelastic response of a confined fluid with different wall-fluid interaction strengths is investigated using simulations. It is found that as the slit asymmetry increases, the density of the fluid film transitions from being rarer to denser than the bulk density. The viscoelastic response time shows a sharp increase beyond a critical asymmetry, deviating from the structural relaxation time. These findings have important implications for fluid transport in nanotechnology.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Environmental Sciences
Ercan Avsar, Kurtulu Bulus, Mehmet Ali Saridas, Burcak Kapur
Summary: Efficient usage of water resources is crucial for environmental protection. An automated electronic irrigation system was developed and tested on strawberry cultivation under various irrigation regimes, showing significant impact on plant growth and yields.
ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL
(2021)
Article
Engineering, Marine
Viet-Thanh Nguyen, Vinh-An Le
Summary: The Duyen Hai port in Tra Vinh province, Vietnam has brought significant economic benefits to the Mekong River Delta since its operation in January 2016. However, the navigation channel to the port has been facing serious sedimentation issues, posing a major obstacle for larger vessels to reach the port. This paper presents the properties of fluid mud and proposes a method to estimate the nautical depth for the port and navigation channel based on rheology observation data and bathymetries measured by multi-frequency echo sounding.
Article
Chemistry, Multidisciplinary
Gaelle Rondepierre, Franz De Soete, Nicolas Passade-Boupat, Francois Lequeux, Laurence Talini, Laurent Limat, Emilie Verneuil
Summary: The dynamics of the contact line in a triple-phase system of silica/oil/water were investigated, revealing a significant decrease in contact line velocity upon the addition of cationic surfactants. A model was derived to successfully explain the selected contact line velocity, and it was demonstrated that the increase in friction coefficient with surfactant concentration is due to the nonlinear adsorption isotherm.
Article
Physics, Multidisciplinary
C. Clavaud, M. Maza-Cuello, C. Fretigny, L. Talini, T. Bickel
Summary: This study reports on the impact of intermolecular forces on the fluctuations of supported liquid films, demonstrating that these forces have a strong influence on the dynamics of the film interface at lower frequencies. Experimental data spanning three frequency decades align well with theoretical predictions considering van der Waals forces, highlighting the significance of intermolecular forces on thermal fluctuations in nanoscale confined fluids.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Franz De Soete, Lea Delance, Nicolas Passade-Boupat, Michael Levant, Emilie Verneuil, Francois Lequeux, Laurence Talini
Summary: The experimental behavior of oil drops suspended in water and passing through a constricted capillary tube under imposed pressure gradient is investigated, revealing strong concentration gradients and surface tension gradients. Local values of surface tension can be monitored using flow rate measurements. Different mechanisms are proposed to balance the surface tension gradient in particle-laden drops and surfactant-laden drops, affecting the passage time of the drops in the constriction.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Chemistry, Multidisciplinary
Gao-Feng Han, Peng Zhang, Pascal Scholzen, Hyuk-Jun Noh, Mihyun Yang, Do Hyung Kweon, Jong-Pil Jeon, Young Hyun Kim, Seong-Wook Kim, Sun-Phil Han, Andrey S. Andreev, Guillaume Lang, Kyuwook Ihm, Feng Li, Jean-Baptiste D'Espinose de Lacaillerie, Jong-Beom Baek
Summary: In this study, a mechanochemical method was used to enhance the reaction rate of carbon hydrogasification and improve its selectivity. The findings of this work have the potential to advance research in carbon hydrogasification and other solid-gas reactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Mechanics
H-P Tran, N. Passade-Boupat, F. Lequeux, L. Talini
Summary: Foams and bubbles formed in liquid mixtures are more stable than in pure liquids due to the thickness-dependent surface tension of liquid films. We provide a quantitative description of the enhanced stability of liquid films in binary mixtures based on experimental data and theoretical analysis.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Construction & Building Technology
C. Paillard, M. Aparicio Cordoba, N. Sanson, J. -B. d'Espinose de Lacaillerie, G. Ducouret, P. Boustingorry, M. Jachiet, C. Giraudeau, V. Kocaba
Summary: The loss of dispersing ability by polycarboxylates ether superplasticizers in alkali-activated slag cements has been widely reported. However, there is no clear-cut explanation for this phenomenon. This study investigates the behavior of poly(methacrylate-g-poly(ethylene glycol)) superplasticizers in NaOH or Na2CO3-activated slag pastes. The observed loss of efficiency is not due to specific properties of the slag particles or structural degradation of the polymer, but rather to changes in solvent quality and polymer conformation caused by the ionic strength of the activating solution.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Paula Araujo Gomes, Jean-Baptiste d'espinose de Lacaillerie, Bruno Lartiges, Martin Maliet, Valerie Molinier, Nicolas Passade-Boupat, Nicolas Sanson
Summary: This study investigated the surface charge characteristics of three microalgae (Chlorella vulgaris, Nannochloropsis oculata, and Tetraselmis suecica) and found that their electrokinetic behavior aligned with the predictions of Ohshima's soft particle theory. The findings suggest that electrostatics play a minor role in microalgae aggregation and adhesion, which have significant implications for environmental and industrial processes.
Article
Physics, Fluids & Plasmas
M. Maza-Cuello, C. Fretigny, L. Talini
Summary: Thinning of supported liquid films driven by thermocapillarity is reported. The study shows that local and moderate heating of the glass substrate induces a thermocapillary flow, allowing the formation of ultrathin films. The thinning dynamics of submicron-thick films is governed by thermocapillary stress within a certain time range. The behavior deviates from a master curve as the films thin down to thicknesses within the range of molecular interactions, which can be attributed to differing signs of disjoining pressures. The study suggests that thermocapillary flows can be used to probe molecular interactions.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Chemistry, Multidisciplinary
Apolline Faidherbe, Maxence Wilmet, Jeremie Teisseire, Francois Lequeux, Laurence Talini
Summary: We conducted a study on the spatially varying thickness of dried films of polymer solutions caused by nonuniform evaporation flux. By using a solid mask placed above the evaporating film, we controlled the heterogeneity of the evaporation flux. Analytical solutions for the thickness profiles during drying were obtained by considering the flows induced in a vertically homogeneous film. Our results provide new insights on the patterns resulting from evaporation masks and can be generalized to minimize thickness heterogeneities in any situation with nonuniform evaporation flux.
Article
Chemistry, Physical
Othman Omikrine Metalssi, Rim Ragoug, Fabien Barberon, Jean-Baptiste d'Espinose de Lacaillerie, Nicolas Roussel, Loic Divet, Jean-Michel Torrenti
Summary: The purpose of this study is to investigate the effects of early exposure to external sulfates on degradation mechanisms in concrete. Microstructure, physical, and chemical behavior are monitored using various experimental techniques, including NMR (27Al and 29Si), ICP, XRD, MIP, and SEM. The results show that mature Portland cement paste degrades rapidly due to the presence of compressed ettringite and gypsum, while the chemical mechanism varies with the duration of curing.
Article
Chemistry, Physical
Laurence Talini, Francois Lequeux
Summary: We investigate the formation of a glassy skin in drying polymer solutions at the air interface and propose a simple approximation method that provides analytical relationships for the polymer concentration over time. The results obtained from the approximation differ by less than 15% from those obtained by numerically solving the diffusion equation. Using this method, we examine the influence of variations in the mutual diffusion coefficient on the thickness of the skin formed during evaporation. We find that the skin thickness strongly depends on the exponent describing the decrease in the diffusion coefficient, in contrast to the slight variation in the polymer volume fraction at the interface.
Article
Chemistry, Physical
Lea Delance, Charlotte Veillon, Nicolas Passade-Boupat, Francois Lequeux, Laurence Talini, Emilie Verneuil
Summary: This study investigates the transfers occurring at the interfaces between oil-in-oil emulsions and air, and reveals the evolution mechanism of the emulsion and the relationship between surface energy and thickness of the PDMS-rich layer at the interface.
Article
Chemistry, Physical
Pascal Scholzen, Guillaume Lang, Andrey S. Andreev, Alberto Quintana, James Malloy, Christopher J. Jensen, Kai Liu, Jean-Baptiste D'espinose de Lacaillerie
Summary: The magnetic properties of electrodeposited cobalt metal nanowires grown in porous membranes are significantly affected by the synthesis conditions, particularly the role of electrolyte additives. Through magnetometry and internal field nuclear magnetic resonance (IF NMR) studies, the magnetic and crystalline structures of Co nanowires with diameters of 50 and 200 nm were compared under different synthesis conditions. The presence of organic additives was found to affect the size and boundaries of cobalt crystal domains, leading to a different magnetic anisotropy behavior in the nanowires.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Gaelle Rondepierre, Francois Lequeux, Emilie Verneuil, Nicolas Passade-Boupat, Laurence Talini
Summary: This study reports on the thinning mechanisms of supported films of surfactant (nTAB) solutions above the critical micellar concentration. Depending on the length of the carbon chain of the surfactant and its concentration, two modes of destabilization of the stratified films are observed, including heterogeneous nucleation and spinodal stratification.
Article
Biochemical Research Methods
Marine Verhulsel, Anthony Simon, Moencopi Bernheim-Dennery, Venkata Ram Gannavarapu, Lauriane Geremie, Davide Ferraro, Denis Krndija, Laurence Talini, Jean-Louis Viovy, Danijela Matic Vignjevic, Stephanie Descroix
Summary: A new gut on chip model has been developed for co-culture of primary epithelial and stromal cells, mimicking the structure and topography of the mouse gut. The collagen scaffold is rigidified by threose-based post-polymerization treatment to maintain its structure and cytocompatibility. Mouse organoids deposited into crypts are able to epithelialize the scaffold and form a polarized epithelial monolayer, demonstrating proper cell segregation along the crypt-villus axis. Fluid shear stress application allows long-term culture of the intestinal epithelium in this biomimetic tool.