Article
Water Resources
Pit Arnold, Mario Dragovits, Sven Linden, Christian Hinz, Holger Ott
Summary: The morphological approach is a computational method for calculating relative permeability and capillary pressure saturation functions. It combines geometric operations with direct flow simulations to calculate fluid phase distribution in the pore space. However, it has limitations in describing imbibition processes and wettability influence. In this study, deterministic and stochastic contact angle distributions are introduced to extend the simulation range and allow for uncertainty analysis. The results show good agreement with experimental data.
ADVANCES IN WATER RESOURCES
(2023)
Article
Multidisciplinary Sciences
Nathan C. Keim, Dani Medina
Summary: The study investigates how to mechanically anneal a sample to minimize memory content and introduces a method to characterize rearrangements within the sample. Experimental results show that a ring-down protocol can achieve a stable state without discernible memories.
Article
Polymer Science
Si-Ying Xiang, Ying-Chun Yao, Miao-Miao Lu, Ya-Jiang Huang, Mi-Qiu Kong, Guang-Xian Li
Summary: The study found that the influence of polystyrene particles with different nanoscale roughnesses on the morphology of polyisobutylene/polydimethylsiloxane blends is strongly dependent on the particles' surface roughness, blend ratio, and shear rate. The roughness effect of particles is particularly significant under slow flow conditions.
CHINESE JOURNAL OF POLYMER SCIENCE
(2021)
Review
Physics, Fluids & Plasmas
Stefano Musacchio, Victor Steinberg, Dario Vincenzi
Summary: In nonuniform flows, polymers undergo strong deformation, leading to the coil-stretch transition with persistent stretching. This transition has been characterized using nonequilibrium statistical mechanics, where the polymer extension entropy reaches a maximum. By studying the differential entropy of the polymer fractional extension, we extended the entropic characterization of the coil-stretch transition in laminar and random velocity fields. In random velocity fields, the entropy of the logarithm of the extension provides a suitable description of the transition. Entropy emerges as an effective tool for understanding and comparing the coil-stretch transition in different flows.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Polymer Science
Jaeman J. Shin
Summary: The effect of inorganic nanoparticles on the structure of hybrid block copolymer particles and the local distribution of nanoparticles is studied. The study focuses on comparing the nanoparticles made of Au and Fe3O4. The distribution of nanoparticles inside the particles was found to affect the overall particle morphology. Au nanoparticles were selectively localized inside certain domains regardless of the particle morphology, while Fe3O4 nanoparticles clustered and segregated to the interfaces of the particles.
Article
Materials Science, Multidisciplinary
Chi Yen Huang, Mareena Antony, Pravinraj Selvaraj, Che Ju Hsu
Summary: The suspension of nanoparticles in the alignment layer improves the performance of liquid crystal devices. The blend alignment layer enhances the dynamic response and operation voltage, and prevents the aggregation of nanoparticles.
Article
Physics, Multidisciplinary
Fernando Caballero, M. Cristina Marchetti
Summary: In this study, a continuum model is used to examine the effect of activity on a phase-separating mixture, highlighting the distinct roles of interfacial active stresses and bulk active stresses. It was found that bulk extensile active stresses can strongly suppress phase separation by sustaining self-stirring of the fluid, significantly reducing the size of the coexistence region relative to passive systems. The phase-separated state is characterized by continuously splitting and merging droplets, as suggested by recent experiments.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
N. Mille, D. De Masi, S. Faure, J. M. Asensio, B. Chaudret, J. Carrey
Summary: In this study, the dynamics of chain formation in magnetic nanoparticles under applied magnetic fields were probed using time-resolved high-frequency hysteresis loops. The formation time of chains was found to strongly depend on the magnetic field amplitude, but not on the frequency studied. Both heating power and hysteresis loop squareness increase with time as chains form.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Jinzi Mac Huang, Nicholas J. Moore
Summary: Recent experiments have shown that a soluble body placed in a fluid can spontaneously form a dissolution pinnacle, which resembles naturally occurring karst pinnacles found in stone forests. These pinnacles are the result of the interaction between interface motion and natural convective flows driven by the descent of relatively heavy solute. Previous research suggested that these structures are associated with shock formation in the underlying evolution equations and require the regularizing Gibbs-Thomson effect for finite tip curvature. However, this study has discovered a class of exact solutions that act as attractors for shape dynamics in two and three dimensions. These solutions exhibit large but finite tip curvature without the need for any regularization and match experimental measurements accurately. The relationship between the dimensions of the initial shape and the final state of dissolution may provide a principle for estimating the age and environmental conditions of geological structures.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Mingwen Chen, Jinhui Zhao, Yan Chen, Guanjie Zheng, Zidong Wang
Summary: The effect of shear flow on the morphological pattern of particles in an undercooled melt is studied using the asymptotic method. The study shows that shear flow intensifies the deformation and distortion of particles in the initial stage of crystal growth. The growth rate of the interface increases in the shear direction of the flow, enhancing the inward decay of the interface. As the shear rate increases, the particle interface becomes seriously deformed and distorted, eventually breaking into smaller particles.
Article
Polymer Science
Wenkang Wei, Yaping Ma, Xiangjie Yan, Chenguang Liu, Aihua He
Summary: Shear flow plays a crucial role in understanding the relationship between processing and properties of polymer products. The present study investigated the effects of shearing and high-molecular-weight polybutene-1 (HMwPB) on the morphologies of oriented crystals in isotactic polybutene-1 (PB). It was found that the formation of a gel-like network of shish-precursors and shear thickening were important factors influencing the crystal structures of PB. Additionally, the addition of a small amount of HMwPB facilitated the earlier formation of shish-precursors and improved the crystallization temperature and degree of orientation of PB.
Article
Mechanics
Tomoaki Watanabe, Koji Nagata
Summary: This study investigates the perturbation response of small-scale shear layers in turbulence using direct numerical simulations (DNS). The analysis of shear layers in isotropic turbulence reveals that the typical layer thickness is approximately four times the Kolmogorov scale ?. The response for sinusoidal perturbations is examined for an isolated shear layer, which represents the mean flow around shear layers in turbulence. The results show that the vortex formation in the shear layer is most effectively promoted by perturbations with a wavelength divided by the layer thickness of about 7. This highlights the efficient promotion of small-scale shear instability in turbulence by velocity fluctuations with a wavelength of about 30?.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Yuqing Tian, Xiao Li, Bing Zhao, Jianjian Zhang, Fuyou Liang
Summary: The association between wall enhancement and instability/rupture of intracranial aneurysms suggests the importance of investigating the transport and accumulation of blood substances related to wall enhancement. Numerical simulations were conducted to explore the relationship between LDL deposition and aneurysm morphology as well as fluid dynamic mechanisms. The study found that the aneurysm-parent artery angle has a significant impact on the severity of LDL deposition.
Article
Mechanics
Mahesh S. Nagargoje, Chanikya Valeti, N. Manjunath, Bhushan Akhade, B. J. Sudhir, B. S. V. Patnaik, Santhosh K. Kannath
Summary: Recent advancements in medical imaging techniques have enabled accurate identification of unruptured intracranial aneurysms. Suitable mathematical models for rupture prediction are important for patient management. This study investigates the influence of morphological parameters on aneurysm hemodynamics and rupture prediction, finding correlations between these parameters and hemodynamic parameters.
Article
Chemistry, Multidisciplinary
Xiaohui Meng, Yan Qiao, Changwoo Do, Wim Bras, Chunyong He, Yubin Ke, Thomas P. Russell, Dong Qiu
Summary: This research successfully achieved a hysteresis-free material by using a low-crosslink-density polyacrylamide hydrogel with hyperbranched silica nanoparticles. These resilient hydrogels exhibit fatigue-free characteristics under large deformations and can accurately detect dynamic deformations.
ADVANCED MATERIALS
(2022)
