Article
Engineering, Chemical
Weixi Guo, Chunying Zhu, Taotao Fu, Youguang Ma
Summary: Experimental investigation of droplet coalescence in a T-junction microchannel revealed four coalescence regimes and showed that droplets with different viscosities tend to coalesce, especially with a viscosity ratio between 1 and 6. The study also systematically examined the effects of viscosity ratio and droplet size on film drainage time and critical capillary number.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Weiyang Chen, Bo Wu, Yaran Yin, Chunying Zhu, Taotao Fu, Xianming Zhang, Youguang Ma
Summary: The flow regime, void fraction, and pressure drop of gas-liquid flow in a SAR microchannel were experimentally studied. Four flow regimes were observed, and correlations to predict regime transitions were presented. The SAR microchannel shows potential as an efficient gas-liquid contactor for highly viscous liquids.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Chemistry, Multidisciplinary
Volodymyr Tkachenko, Sara Coppola, Veronica Vespini, Daniele Tammaro, Pier Luca Maffettone, Pietro Ferraro, Simonetta Grilli
Summary: Studied the dynamics of oscillation and jetting of high viscosity liquid dielectrics in an electric field, and explored the viscosity dependence of the fluid. This study helps in the appropriate design of EHD processes and offers possibilities for rheological characterization of liquid polymers at nanoliter scale.
Article
Engineering, Chemical
Haiyun Ma, Qiankun Zhao, Chaoqun Yao, Yuchao Zhao, Guangwen Chen
Summary: The hydrodynamics of liquid-liquid slug flow with various fluid systems were investigated to reveal the viscous effects of both phases. The study discussed the operation range, droplet formation, film thickness, and pressure drop of slug flow. Results showed the importance of inertia and viscous forces in flow pattern transition, leading to the adoption of a universal flow map and new empirical correlations for droplet formation and pressure drop.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Anuj Dash, Aloke Paul
Summary: A unique method is proposed for estimating all types of diffusion coefficients in a multicomponent system by intersecting two different types of diffusion paths. This method overcomes the limitations of the diffusion couple methods and reduces the effort required to estimate diffusivities with uncertainty. The modification of equation schemes for different types of diffusion paths is explained in detail.
Article
Mechanics
Yanshen Li, Jochem G. Meijer, Detlef Lohse
Summary: For an immiscible oil drop immersed in a stably stratified ethanol-water mixture, different viscosities of the drop trigger different oscillatory instability mechanisms, where low viscosity drops are limited by the unstable Marangoni flow and high viscosity drops are limited by gravitational effects. A unified scaling theory framework further describes the transition between these two mechanisms effectively.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Electrochemistry
Anna Brudzisz, Damian Gizinski, Jinhee Lee, Mervat Ibrahim, Krzysztof S. Gocman, Jinsub Choi, Wojciech J. Stepniowski
Summary: The effect of glycerol addition to 1 M NaOH aqueous electrolyte used for passivating copper on the morphology, crystalline structure, and composition was investigated. The results showed that the morphology depended largely on the glycerol content, passivation duration, and to a lesser extent on the applied potential. Even a small addition of glycerol significantly changed the composition of the passive layer. The addition of glycerol led to the formation of a passive layer composed mainly of crystalline ZnO and amorphous Cu2O, with improved macroscopic stability.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Andrey Milchev, Kurt Binder
Summary: This study investigates the behavior of two types of semiflexible polymers with the same chain length but different persistence lengths, confined between parallel repulsive walls. The formation of nematic layers near the walls is observed at specific concentrations. In the ordered phase, both self-diffusion and interdiffusion of chains are significantly slowed down, which has implications for the production of polymeric coatings.
Article
Energy & Fuels
Semyon Vostretsov, Anna Yagodnitsyna, Alexander Kovalev, Artur Bilsky
Summary: The influence of parameters such as total flow rate, flow rate ratio, and residence time on mass transfer during two-phase flow in a T-shaped microchannel was investigated. The study focused on the plug flow regime using a water-glycerol solution as the dispersed phase and tri-n-butyl phosphate (TBP) as the carrier phase. The transition boundary between dispersed and parallel flow patterns was determined and a mass transfer model was developed based on plug length and velocities. Additionally, the concentration fields within the continuous phase were analyzed, and the effects of flow rate ratio, total flow rate, and residence time on mass transfer rate and extraction efficiency were established. A model for the overall volumetric mass transfer coefficient was also developed with a high R-squared value of 0.966.
Article
Engineering, Environmental
Alexander Kovalev, Anna Yagodnitsyna, Artur Bilsky
Summary: The study focuses on the hydrodynamic features of liquid-liquid flows in serpentine microchannels to control mixing and mass transfer. Different curvatures of the microchannels lead to changes in plug acceleration/deceleration, plug length, and flow patterns in both oil slugs and aqueous plugs. Optimal conditions for efficient mixing and mass transfer in the plug flow regime are determined based on the research findings.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Ben D. Fudge, Radu Cimpeanu, Arnaud Antkowiak, J. Rafael Castrejon-Pita, Alfonso A. Castrejon-Pita
Summary: In this study, the impact dynamics of droplets onto liquid pools were investigated. It was found that the viscosity ratio between the pool and the droplet significantly influences the splashing threshold and the composition of the ejecta. Surprisingly, under certain conditions, no splashing was observed.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
Bincheng Luo, Chunsheng Yu, Yuehao Chen, Kunhai Yue, Lifan Yue, Tao Chen
Summary: This study analyzed the oxidation characteristics of six different crude oil samples using thermogravimetric analysis and differential scanning calorimetry methods. The results showed that the oxidation of crude oil can be divided into three stages: low-temperature oxidation, fuel deposition, and high-temperature oxidation. In the low-temperature oxidation stage, crude oil with higher viscosity has a higher activation energy, while in the high-temperature oxidation stage, crude oil with higher viscosity has a lower activation energy.
Article
Chemistry, Physical
E. A. Lisin, O. S. Vaulina, I. I. Lisina, O. F. Petrov
Summary: Self-propelled colloids, active polymers and membranes, driven granular layers, and hybrid synthetic-biological systems are examples of systems containing synthetic active Brownian particles. However, there is a lack of statistical theory describing the underdamped Brownian motion of self-propelled particles, especially in low-viscosity mediums. This paper presents numerical simulation results and proposes simple corrections to the basic theory of overdamped active Brownian motion in order to calculate effective diffusion coefficients and persistence lengths in different viscosity mediums.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Mechanics
Aditya Heru Prathama, Carlos Pantano
Summary: This study investigates the linear stability of a vertical interface separating two miscible fluid columns of different densities and viscosities under the influence of gravity, showing how disturbances grow over time depending on wave numbers and flow parameters. It is found that the growth rate of perturbation energy is influenced by small wavenumbers initially, dominated by two-dimensional modes, with substantial transient growth observed at higher wave modes initially followed by decay over time. Sensitivity analysis on perturbation growth with respect to initial time, density, and viscosity ratios is also conducted.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Chemical
Cong Wang, Daoyin Liu, Jiliang Ma, Cai Liang, Xiaoping Chen
Summary: Particle coating in fluidized beds is a widely used technique. In this study, the growth mechanisms of the coating shell on porous Al2O3 particles were investigated, including the effects of drying conditions and solution viscosities. The study revealed that the growth of the coating shell can be classified into three modes: layer growth, island growth, and irregular growth, with smaller droplet viscosity promoting layer growth.
Article
Mathematics, Applied
Julien Dambrine, Morgan Pierre
APPLIED MATHEMATICS AND OPTIMIZATION
(2020)
Article
Computer Science, Interdisciplinary Applications
Romain Chassagne, Julien Dambrine, Niki Obiwulu
COMPUTERS & GEOSCIENCES
(2020)
Article
Physics, Fluids & Plasmas
Jean-Baptiste Salmon, Frederic Doumenc
PHYSICAL REVIEW FLUIDS
(2020)
Article
Physics, Fluids & Plasmas
Jean-Baptiste Salmon, Laurent Soucasse, Frederic Doumenc
Summary: Through numerical and analytical methods, this study investigates the impact of solutal free convection on buoyant solute diffusion at microfluidic scales, revealing different diffusion regimes and conditions where gravity currents are influenced by solute diffusion.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Chemistry, Multidisciplinary
Sandy Morais, Gerald Clisson, Teresa Fina Mastropietro, Maria L. Briuglia, Joop H. ter Horst, Jacques Leng, Jean-Baptiste Salmon
Summary: The developed disposable microfluidic chip mimics the vapor diffusion method for exploring protein crystallization conditions and allows for quantitative information extraction on the crystallization process. Experiments conducted on a therapeutic protein show the estimation of solubility, width of the metastable zone, and the ability to perform crystallization/dissolution cycles for selective dissolution and crystal size increase.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Multidisciplinary Sciences
Sofia Jaho, Niels Junius, Franck Borel, Yoann Sallaz-Damaz, Jean-Baptiste Salmon, Monika Budayova-Spano
Summary: This protocol outlines a method for manufacturing reproducible and inexpensive microfluidic devices for protein crystallization on-chip using the dialysis method, allowing in situ crystallography experiments at room temperature. The main features include integrating a semipermeable membrane between two chip layers, utilizing microfluidic advantages, and patterned with soft imprint lithography. The devices offer precise control over crystallization processes and can collect X-ray diffraction data sets for structure determination at room temperature.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2021)
Review
Chemistry, Multidisciplinary
Patrice Bacchin, Jacques Leng, Jean-Baptiste Salmon
Summary: This review comprehensively discusses the applications of evaporation, pervaporation, and forward osmosis at the microfluidic scales, highlighting both the differences and similarities between these passive-transport phenomena.
Article
Energy & Fuels
Elie Ayoub, Perrine Cologon, Marie Marsiglia, Jean-Baptiste Salmon, Christine Dalmazzone
Summary: An online experimental setup has been developed to accurately quantify surfactants in coreflood effluents, improving measurement accuracy.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Hoang-Thanh Nguyen, Anne Bouchaudy, Jean-Baptiste Salmon
Summary: We have developed a microfluidic tool to measure the diffusion coefficient of solutes in an aqueous solution. By triggering the interdiffusion between pure water and the initially separated solution, our chip can track the temporal relaxation of the concentration gradient to measure the diffusion coefficient. Our experiments show that the interfacial-driven transport phenomena do not affect the measurement results.
Correction
Chemistry, Multidisciplinary
Charles Loussert, Frederic Doumenc, Jean-Baptiste Salmon, Vadim S. Nikolayev, Beiatrice Guerrier
Article
Chemistry, Physical
Hrishikesh Pingulkar, Jean-Baptiste Salmon
Summary: This article presents a model to describe the dynamics of confined directional drying of a colloidal dispersion. Based on classical fluid mechanics and capillary phenomena, the model predicts different growth regimes for the consolidated packing. These findings emphasize the importance of relative humidity control in such experiments.
Article
Physics, Fluids & Plasmas
Camille Keita, Yannick Hallez, Jean-Baptiste Salmon
Summary: This study demonstrates that diffusion significantly limits the measurement times of the equation of state of charge-stabilized colloidal dispersions, and presents a microfluidic chip that can measure the entire equation of state at the nanoliter scale in a few hours. Time-resolved analyses of relaxation to equilibrium in this microfluidic experiment also provide direct estimates of the collective diffusion coefficient of the dispersion in Donnan equilibrium with a salt reservoir.
Article
Chemistry, Physical
Benjamin Sobac, Sam Dehaeck, Anne Bouchaudy, Jean-Baptiste Salmon
Article
Biochemical Research Methods
Hoang-Thanh Nguyen, Morgan Massino, Camille Keita, Jean-Baptiste Salmon
Article
Biochemical Research Methods
Niels Junius, Sofia Jaho, Yoann Sallaz-Damaz, Franck Borel, Jean-Baptiste Salmon, Monika Budayova-Spano