Article
Engineering, Chemical
Yunfei Ling, Jiguo Tang, Hongtao Liu
Summary: The study found that adding fenestrated patches after B-T shunt can improve the unbalanced perfusion to branch outlets but may increase energy loss. Decreasing the fenestrated diameter can increase the flow distribution ratio of poorly-grown arteries but also lead to higher energy loss.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Mechanics
P. Brandao, M. N. Ouarzazi, S. C. Hirata, A. Barletta
Summary: The extension of Carreau and Carreau-Yasuda rheological models to porous media allowed for the study of mixed convection of pseudoplastic and dilatant fluids. Different dimensionless parameters were introduced to analyze the onset of convection under various conditions, leading to the identification of different instability modes and regimes based on the presence of throughflow. A mechanical energy budget analysis was performed to understand the physical effects of the interaction between throughflow and disturbances in the porous medium, showing the potential role of macroscale properties in stabilizing or destabilizing effects. Comparisons with experimental results further validated the theoretical predictions.
Article
Physics, Fluids & Plasmas
Santiago G. Solazzi, Beatriz Quintal, Klaus Holliger
Summary: This work presents a numerical approach to model the attenuation and modulus dispersion of compressional waves due to squirt flow in porous media saturated by Maxwell-type non-Newtonian fluids. The results show that wave signatures strongly depend on the Deborah number, with larger values leading to increased attenuation and a shift towards higher frequencies.
Article
Mathematics, Applied
Sergey Ershkov, Dmytro Leshchenko
Summary: In this research, we have revisited the mathematical modeling approach for rivulet flows on inclined surfaces using viscous-plastic theory in Cartesian coordinates. We have obtained a semi-analytical solution for nonstationary creeping approximation of plane-parallel flow. The main motivation of this study is to improve the accuracy of calculations for possible applications in fluid dynamics research in technological or engineering areas. Despite the difficulty in solving the equations of motion for non-Newtonian fluids, we have successfully obtained analytical expressions for velocity components in the directions of motion for slowly moving rivulet flows.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Mathematics, Applied
Hugo Beirao da Veiga, Jiaqi Yang
Summary: The study focuses on the partial regularity of suitable weak solutions to incompressible non-Newtonian fluids in the shear-thinning case p < 2, revealing that singular points are concentrated on a closed set with zero one-dimensional Hausdorff measure.
Article
Mathematics, Applied
Zujin Zhang, Sinan Wang
Summary: By estimating the nonlinear term in an innovative way, the optimal regularity criterion for shear thinning fluids can be obtained via the velocity field.
APPLIED MATHEMATICS LETTERS
(2021)
Article
Engineering, Civil
Nickolas Martin Brown, Morteza Dejam
Summary: This study mathematically derived and studied the tracer dispersion in hydraulic fractures with different geometries and porous walls for non-Newtonian fluid flows. The study found that the coefficient of the shear dispersion term follows a certain order for different geometrical models and flow behaviors. The study also emphasized the importance of considering the communication between hydraulic fractures and the rock matrix for determination of tracer dispersion. The findings of this study can pave the way for future investigations on tracer dispersion in hydraulic fractures with rough and porous walls.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Environmental
Zhongdong Wang, Xingyu Xiang, Hongwei Zhu, Yanpeng Dong, Chunying Zhu, Youguang Ma, Bing Sun, Stanislav A. Patlazhan, Taotao Fu
Summary: The study focuses on shear-thinning non-Newtonian fluids in T-junction parallelized microchannels, providing valuable insights into the emulsification process and droplet generation synchronicity. Silicone oil is used as the continuous phase, while sodium carboxymethyl cellulose (CMC) aqueous solutions are used as the dispersed phase. The study investigates the effects of two-phase flow rates and rheological characteristics on the droplet generation stages, and also explores the coupling of interface evolution between parallelized microchannels, highlighting the periodic changes between synchronous and asynchronous droplet generation types and their impact on droplet monodispersity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
M. C. F. Silva, J. B. L. M. Campos, J. D. P. Araujo
Summary: This study fills a knowledge gap by simulating slug flow in inclined tubes using CFD tools. The results show that tube inclination significantly affects the flow and changes the position, velocity, and shape of the bubbles, as well as the flow of liquid around them.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Mechanics
Qi Chen, Jingkun Li, Yu Song, Bin Chen, David M. Christopher, Xuefang Li
Summary: Pressure-driven microdroplet formation was experimentally investigated using glass flow-focusing devices, showing the effects of factors and self-similarities in dispersed thread formation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Mathematics
Bagh Ali, N. Ameer Ahammad, Windarto, Abayomi S. Oke, Nehad Ali Shah, Jae Dong Chung
Summary: This study investigated the thermodynamics of a rotating dusty Maxwell water-based nanofluid with suspended dust particles and explored the effects of increased volume fraction of TiO2 particles and dust on fluid dynamics. By using appropriate similarity transformations, the governing PDEs for both fluid and dusty-phase models were transformed into non-linear linked non-dimensional ODEs. The bvp4c technique in MATLAB was employed to obtain graphical results. The magnitude of primary and secondary velocities in both phases decreased with an increase in dust particle volume concentration, Lorentz force, rotating, and Maxwell fluid parameters. The temperature variation in both dust and nanofluid phases was influenced by the increased strength of dust particles and TiO2.
Article
Mechanics
Yue Li, Jinlei Mu, Chengwang Xiong, Zizheng Sun, Caiyun Jin
Summary: This study examines the influence of rheological parameters on the properties of fresh cement mortar fluid through different curvatures of a pipe bend. The results show that sharper curvatures and higher power-law indexes can reduce the asymmetric unyielded zone, while increased yielding stress and power-law index lead to greater total pressure drop and additional pressure loss.
Article
Mechanics
Dmitrii E. Roshchin, Stanislav A. Patlazhan
Summary: The effect of external fluid on the mixing efficiency of miscible Newtonian liquids inside a two-dimensional microdroplet in a rectilinear microchannel is investigated. It is found that the mixing time is a power-law function of Peclet number and is determined by the rheological properties of the fluid. Additionally, three distinct liquid mixing mechanisms inside the microdroplet at different confinement parameter values are revealed.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Materials Science, Multidisciplinary
Alessio Pricci, Marco D. de Tullio, Gianluca Percoco
Summary: This paper formulates mathematical models to describe the fluid flow of non-Newtonian fluids inside ducts with convergent and cylindrical sections. The models are validated through comparisons with computational fluid dynamics solutions and show potential in predicting important quantities for processes like 3D printing.
MATERIALS & DESIGN
(2022)
Article
Mechanics
Ming Dong, Mengqi Zhang
Summary: This paper investigates the centre instability in Oldroyd-B viscoelastic pipe flow and reveals its asymptotic structure and different instability modes under different control parameters through asymptotic analysis.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Biochemical Research Methods
Gaetano D'Avino, Pier Luca Maffettone
Summary: This study investigates the effect of wall slip on the ordering of particles suspended in a viscoelastic liquid through numerical simulations. The results show that wall slip slows down the formation mechanism of particle ordering, especially on hydrophobic surfaces.
Article
Polymer Science
Antonio Vittoria, Gaia Urciuoli, Salvatore Costanzo, Daniele Tammaro, Felicia Daniela Cannavacciuolo, Rossana Pasquino, Roberta Cipullo, Finizia Auriemma, Nino Grizzuti, Pier Luca Maffettone, Vincenzo Busico
Summary: This study evaluated a state-of-the-art high-throughput experimentation (HTE) workflow for catalytic olefin polymerization, demonstrating its ability to prepare new materials and produce databases for investigating quantitative structure-property relationships (QSPRs). The results showed the robustness of the approach and its potential to reduce time to market for new products by integrating HTE and artificial intelligence approaches to QSPR problem solving.
Article
Mechanics
Giancarlo Esposito, Salvatore Romano, Martien A. A. Hulsen, Gaetano D'Avino, Massimiliano M. M. Villone
Summary: The dynamics of a cell in cylindrical and square microfluidic channels with non-negligible inertia is studied using numerical simulations. In cylindrical channels, the cell migrates to a radial equilibrium position depending on the cell's softness and fluid characteristics. In square channels, the dynamics are more complex with multiple equilibrium positions depending on the fluid characteristics and cell's softness.
Article
Polymer Science
Daniele Tammaro, Massimiliano Maria Villone, Pier Luca Maffettone
Summary: This study focuses on the design, production, and characterization of microfoamed strands using CO2, exploring the effects of operating parameters on CO2 utilization in the 3D foam-printing process. The mechanical properties of the strands were explained by an innovative model taking into account polymer crystallinity content.
Article
Engineering, Manufacturing
Roberta Della Gatta, Valerio Lampitella, Marco Trofa, Gaetano D'Avino, Domenico Borrelli, Antonio Caraviello, Antonello Astarita
Summary: This study aims to improve the energy efficiency of selective laser melting of aluminum alloys by increasing the packing factor of the powder bed. A discrete element method model is used to study powder spreading, and experiments are conducted to validate the findings. Multiple parameters are measured to assess the effectiveness of the process.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Stefano De Rosa, Daniele Tammaro, Gaetano D'Avino
Summary: This study investigates the die swell phenomenon in 3D printing through experiments and fluid dynamic simulations. A novel procedure is developed to measure the die swell ratio accurately and quickly during the printing process. The results show a linearly increasing swelling ratio at low printing speeds, a flattened trend at moderate speeds, and a sudden increase at high velocities. The experimental measurements are in good agreement with numerical predictions for typical printing velocities in commercial 3D printers, supporting the reliability of the developed procedure.
Article
Mechanics
Alie Abbasi Yazdi, Gaetano D'Avino
Summary: This study investigates the sedimentation behavior of a spherical particle in an elastoviscoplastic fluid near a flat wall through direct numerical simulations. The governing equations are solved using the finite element method with an Arbitrary Lagrangian-Eulerian formulation. The fluid is modeled using the modified Giesekus constitutive equation proposed by Saramito (2007). The results show that the presence of yield stress reduces the settling velocity and reverses the migration direction of the particle compared to the purely viscoelastic case. The effect of the wall on the yielded and unyielded regions around the particle is also examined. The reversed particle migration is attributed to the different shear rate distribution caused by the presence of the yielded region.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Caitlin V. Wood, Vladimir I. Razinkov, Wei Qi, Christopher J. Roberts, Jan Vermant, Eric M. Furst
Summary: When monoclonal antibodies come into contact with air-water interface, they tend to form aggregates, which has negative effects on their performance. So far, it has been challenging to detect and characterize interfacial aggregation. In this study, the mechanical response induced by interfacial adsorption was examined by measuring the interfacial shear rheology of a model antibody, AS-IgG1, at the air-water interface. The results revealed that strong viscoelastic layers of AS-IgG1 were formed upon protein adsorption, and the compliance of the interfacial protein layer was found to be correlated with the pH and concentration of the bulk solution.
Article
Engineering, Chemical
Mariana Rodriguez-Hakim, Luka Oblak, Jan Vermant
Summary: Stable foams have important applications, but legislative initiatives restrict the use of surface active materials. This study presents an innovative foaming technology that produces ultrastable foams through particle densification. The foams, stabilized by aqueous nanosilica, have excellent mechanical resistance to maintain stability. These nanosilica foams are tested in concrete applications, showing improved freeze-thaw resistance and material strength. The stability criterion derived from interfacial rheological properties can be applied to other complex interfaces.
ACS ENGINEERING AU
(2023)
Article
Computer Science, Interdisciplinary Applications
Manisha Chetry, Domenico Borzacchiello, Gaetano D'Avino, Luisa Rocha Da Silva
Summary: This paper proposes a computational framework for reducing the model order of viscoelastic fluid flows. It focuses on stabilizing the reduced order model and efficiently approximating non-linear terms in the governing equations. Three different stabilization approaches are compared, and two techniques for handling non-linear terms are examined. Numerical experiments are conducted on two benchmark flows, and potential accuracy losses of the reduced order model are discussed.
COMPUTERS & FLUIDS
(2023)
Article
Mechanics
Stelios Alexandris, Daniel Ashkenazi, Jan Vermant, Dimitris Vlassopoulos, Moshe Gottlieb
Summary: When surface-active molecules or particles assemble at fluid-fluid interfaces, the rheological properties of these interfaces become complex, which plays an important role in processes involving interface flow and deformation. However, measuring interfacial rheological properties of polymers at the air-water interface is challenging due to various factors such as weak interactions with the water subphase, polymer backbone conformation, glass transition of the interfacial layer, and memory effects. In this study, we conducted systematic rheological measurements of polymer-laden interfaces and compared the results obtained by different types of rheometers. We found that the reproducibility and comparability of the rheological data were poor, mainly due to differences in layer preparation methods. Therefore, it is crucial to control the surface pressure and use a specific method to prepare the layers in order to obtain reliable and meaningful rheological data.
JOURNAL OF RHEOLOGY
(2023)
Article
Multidisciplinary Sciences
Florence J. Mueller, Lucio Isa, Jan Vermant
Summary: In this study, an innovative approach to improve colloidal gels by introducing surface roughness to the particles is proposed, resulting in enhanced toughness and self-healing properties. The functionalized rough particle gels show potential for various applications, such as xerogel fabrication and high-fidelity extrusion 3D-printing.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Marcel Rey, Jannis Kolker, James A. Richards, Isha Malhotra, Thomas S. Glen, N. Y. Denise Li, Fraser H. J. Laidlaw, Damian Renggli, Jan Vermant, Andrew B. Schofield, Syuji Fujii, Hartmut Loewen, Paul S. Clegg
Summary: This study investigates the effect of individual microgel morphology on the destabilization of responsive emulsions. The polymeric properties of microgels enable stimuli-responsive behavior while the colloidal properties provide long-term stability to the emulsions.
NATURE COMMUNICATIONS
(2023)
Article
Biochemical Research Methods
Zhe Wang, Vittorio Bianco, Pier Luca Maffettone, Pietro Ferraro
Summary: Space-time digital holography (STDH) maps holograms in a hybrid space-time domain to achieve extended field of view, resolution enhanced, quantitative phase-contrast microscopy and velocimetry of flowing objects in a label-free modality. However, in order to ensure proper imaging, the velocity of the objects in microfluidic channels has to be well-matched to the acquisition frame rate, which is the major constraint of the method. Also, imaging all the flowing samples in focus at the same time, while avoiding hydrodynamic focusing devices, is a highly desirable goal.
Article
Chemistry, Physical
Stefano Villa, Domenico Larobina, Antonio Stocco, Christophe Blanc, Massimiliano M. M. Villone, Gaetano D'Avino, Maurizio Nobili
Summary: In this article, the mobilities of prolate ellipsoidal micrometric particles close to an air-water interface were measured using dual wave reflection interference microscopy. The particle's position and orientation with respect to the interface were simultaneously measured as a function of time. The experiment and simulation results showed agreement with slip and no-slip boundary conditions predictions for different types of particle translations and rotations at the air-water interface. The evidences were rationalized within the framework of surface incompressibility at the interface.
