Article
Computer Science, Interdisciplinary Applications
Yalan Zhang, Xiaojuan Ban, Yu Guo, Mohammad S. Obaidat
Summary: This paper proposes a new system for simulating collisions and coupling between non-Newtonian fluids and solids to address the unreasonable boundary conditions in existing SPH non-Newtonian fluid simulations. By sampling solids as boundary particles and optimizing the calculation formula of interaction forces, fluid particles interact directly with the boundary in an iterative manner, improving the physical accuracy of the simulation.
SIMULATION MODELLING PRACTICE AND THEORY
(2021)
Article
Polymer Science
Luis Americo Carrasco-Venegas, Jose Vulfrano Gonzalez-Fernandez, Luz Genara Castaneda-Perez, Guido Palomino-Hernandez, Federico Alexis Duenas-Davila, Salvador Apolinar Trujillo-Perez
Summary: The rheological behavior of aqueous solutions of polyvinyl alcohol at different concentrations and temperatures has been evaluated using five non-Newtonian fluid models. The Sisko and Robertson-Stiff models show better regression parameters, and the Ellis de Haven model exhibits greater stability in terms of the coefficient of variation of the viscosity factor. Therefore, both statistical parameters and the viscosity factor need to be considered when choosing the appropriate non-Newtonian fluid model for polyvinyl alcohol solutions.
Article
Chemistry, Multidisciplinary
Anuva Pal, Rajinder Pal
Summary: The rheology of oil-in-water emulsions thickened by starch nanoparticles was investigated in this study. It was found that at a given nanoparticle concentration, the emulsions behave as a Newtonian fluid at low oil concentrations and exhibit shear-thinning behavior at high oil concentrations. Furthermore, increasing the nanoparticle and oil concentrations increases the consistency of the emulsion and enhances its shear-thinning behavior.
Article
Construction & Building Technology
P. V. P. Moorthi, Athira Gopinath, Prakash Nanthagopalan
Summary: This paper provides a comprehensive review of the mechanistic origins, influencing parameters, and measured data on the lubrication layer (LL) in concrete pumping. It attempts to establish a link between different theories and provides a fundamental understanding of the underlying mechanisms.
MAGAZINE OF CONCRETE RESEARCH
(2023)
Article
Polymer Science
Angel Romo-Uribe
Summary: The study investigated the extensional flow behavior of PBIC and HPC solutions under capillary breakup, finding differences in molecular conformation and breakup times between the two polymers.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Angel Romo-Uribe
Summary: This research demonstrates the tuning of conformation in semiflexible polymers under different solvent conditions using shear rheology, showing changes in persistence length and scaling law. The results provide insights into the behavior of these polymers in solution and help understand the Saito scaling for anisotropic particles.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Physical
Tandrima Banerjee, Abhijit Samanta, Ajay Mandal
Summary: The rheological behaviors of polymer-surfactant binary mixtures, specifically partially hydrolyzed polyacrylamide (PHPAM) polymer and sodium dodecyl sulfate (SDS) surfactant solutions, were investigated in this study. The addition of salt and alkali was found to have significant effects on the viscosity of these solutions. The findings provide important insights into the understanding of the rheological behaviors of polymer-surfactant mixtures.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Neeraj S. S. Borker, Donald L. L. Koch
Summary: This study calculates the rheology of suspensions of rotating rings in low Reynolds number simple shear flow through numerical simulations. The influences of pairwise interactions and hydrodynamic interactions on the steady-state orbit distribution and the flow properties of the suspension are investigated. The shear rate dependence of rheology for Brownian rings is also explored.
JOURNAL OF RHEOLOGY
(2023)
Article
Mechanics
S. Hazra, A. Nath, S. K. Mitra, A. K. Sen
Summary: This study investigates the dynamics of rigid microparticles in confined flows of strongly shear-thinning viscoelastic (STVE) fluids at very low Reynolds numbers. It reveals five different regimes depending upon the fluid properties and flow rates, with the occurrence of these regimes depending on the STVE parameter and average strain rate. The dynamics of particles in the different regimes is underpinned by the synergy between viscoelastic lift force and shear-thinning lift force.
Article
Chemistry, Physical
Martina Basic, Branko Blagojevic, Chong Peng, Josip Basic
Summary: This paper introduces a novel meshless and Lagrangian approach, named Lagrangian Differencing Dynamics (LDD), for simulating non-Newtonian flows. The solution is obtained by decoupling the solutions of pressure and velocity using a split-step scheme. Matrix-free solution to equations and Lagrangian advection of mesh-free nodes enabled fully parallelized implementation for affordable computing time and large time steps.
Article
Engineering, Chemical
Tomohiro Fukui, Misa Kawaguchi
Summary: This study investigates the effects of particle inertia and concentration on microscopic particle arrangement and macroscopic rheology in a narrow channel. Simulations of pressure-driven suspension flow were performed, and the results show that the velocity profiles and particle equilibrium positions are influenced by the Reynolds number and particle concentration, leading to changes in macroscopic apparent viscosity.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Mechanics
Roumaissa Hassaini, Alec J. Petersen, Filippo Coletti
Summary: When inertial particles are dispersed in a turbulent flow at high concentrations, their behavior and the turbulence are profoundly changed. Laboratory measurements reveal that sub-Kolmogorov particles falling in homogeneous air turbulence experience intensified clustering and increased settling rate. This settling enhancement is attributed to the predominantly downward fluid velocity and increased slip velocity between particles and the fluid. The concentrated particles possess a higher effective Stokes number, leading to larger relative velocities and accelerations that may impact inter-particle collision probability.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Xianrong Liang, Wulei Cai, Honghui Chen, Yunfeng Zhao, Heng Wu, Mengmeng Wang, Gang Jin
Summary: The method proposed in the research generates oscillatory extensional flow using an eccentric cylinder flow, with the frequency and amplitude controlled by the angular velocity and eccentricity of the cylinders. This flow field shows promise as a rheological tool for investigating the effects of extensional flows on dispersion dynamics.
Article
Physics, Multidisciplinary
Ilya Svetlizky, Yael Roichman
Summary: By examining the response of a quasi-two-dimensional colloidal suspension to a localized circular driving induced by optical tweezers, we were able to observe a sharp spatial crossover from far- to near-thermal-equilibrium regions of the suspension. This led to particles migrating from high to low Pe regions and forming strongly inhomogeneous steady-state density profiles with an emerging length scale that does not depend on particle density. Our results also showed that the phenomenological two phase fluid constitutive model aligns with the observed behavior.
PHYSICAL REVIEW LETTERS
(2021)
Article
Mechanics
R. H. Hernandez
Summary: This study investigates the evolution of concentrated particle suspensions in a two dimensional channel flow, focusing on shear-induced migration phenomenon in both Newtonian and non-Newtonian carrier fluids. A numerical model based on the finite volume method is developed to predict flow field, particle migration fluxes and gravitational mechanisms.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
