Article
Nutrition & Dietetics
Mireia Bolivar-Prados, Noemi Tomsen, Yuki Hayakawa, Satomi Kawakami, Kazuhiro Miyaji, Jun Kayashita, Pere Clave
Summary: A rheological protocol was designed and validated to accurately measure the shear viscosity of thickening products and assess the impact of oral and pharyngeal factors on therapeutic effect. The study showed that different laboratories can obtain similar and accurate measurements using this protocol.
Article
Chemistry, Multidisciplinary
Pengchong Wei, Pan Gao, Jialong Yang, Wei Pu
Summary: It is crucial to understand the variation of the oil film and its accompanying friction properties under different dynamic operating conditions in order to comprehend the friction mechanism and control friction behavior. Molecular dynamics simulations were conducted to investigate the friction characteristics under boundary lubrication (BL) and elastohydrodynamic lubrication (EHL) conditions. The findings suggest that the friction force is strongly influenced by the interfaces where relative sliding occurs, as well as the number, velocity difference, and solidification degree of these interfaces. The variation of amplitude and frequency under dynamic load has significant effects on the density and motion range of the lubricating layer, which ultimately affect friction.
Article
Chemistry, Multidisciplinary
Pengchong Wei, Pan Gao, Jialong Yang, Wei Pu
Summary: This research conducted nonequilibrium molecular dynamics simulations with different numbers of hexadecane molecules as lubricating oil to model the friction characteristics under dynamic speed and load conditions. The findings showed that the friction force is closely related to the interfaces where relative sliding occurs, and the number, velocity difference, and degree of solidification of these interfaces have significant influences. The variation of amplitude under dynamic load affects the density of the lubricating layer, while the variation of frequency affects the range of motion of the molecular layer, and both effects are crucial for friction.
Article
Engineering, Mechanical
Scott Bair
Summary: Recent progress in elastohydrodynamic lubrication (EHL) has been achieved through a shift in method from adjusting viscosity as a parameter to measuring it using viscometers. However, measuring shear-dependent viscosity in lubricating oils is challenging due to other phenomena affecting constitutive behavior. The lack of understanding of thermal feedback in viscometers has resulted in wasted effort in EHL friction research.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Pooyath Lekshmy Venugopalan, Ambarish Ghosh
Summary: The study demonstrates the application of magnetic micromotors for investigating the rheological properties of human blood, providing a new method for the biophysical study of blood. This may lead to an expanded scope of micromotors for probing other related systems.
Article
Geosciences, Multidisciplinary
Francesco Vetere, Maurizio Petrelli, Diego Perugini, Sarah Haselbach, Daniele Morgavi, Alessandro Pisello, Gianluca Iezzi, Francois Holtz
Summary: This study investigates the impact of crystal nucleation and growth on the viscosity of andesitic magmas at 1 atm pressure. It is found that both shear rate and undercooling significantly affect the timescale of viscosity increase. The plagioclase growth rates estimated from the data are much faster than those under static conditions, highlighting the importance of considering shear rate effects in modeling magmatic and volcanic processes.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Multidisciplinary Sciences
Vikram Rathee, Joia Miller, Daniel L. Blair, Jeffrey S. Urbach
Summary: We directly measured the stress at the boundary of a shear-thickening cornstarch suspension and found persistent regions of high local stress propagating in the flow direction. The structure of these propagating fronts was determined, including the profile of boundary stress and the nonaffine velocity of particles. We also measured the relative flow between the particle phase and the suspending fluid and found it to be highly localized to the fronts and changing direction across the front. These fronts are composed of a localized region of high dilatant pressure and low particle concentration.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Applied
Chaiwut Gamonpilas, Akapong Kongjaroen, Pawadee Methacanon
Summary: Food texture manipulation and modification is an effective approach to reduce the risk of aspiration in dysphagia management. By adding thickening agents, the transit time of the bolus can be increased, promoting safer swallowing. The rheological and tribological properties of the bolus, including viscosity, hardness, cohesiveness, and adhesiveness, play crucial roles in determining safe swallowing.
FOOD HYDROCOLLOIDS
(2023)
Article
Engineering, Biomedical
Christine Poon
Summary: In this study, the density and dynamic viscosity of culture media were measured and found to increase with the % volume of added fetal bovine serum. The viscosity of 5% FBS-supplemented RPMI-1640 was observed to significantly increase after 3 days of culture, with distinct differences between cell lines. These experimentally-derived values were applied in computational fluid dynamics analysis, showing differences in wall shear stress and pressure between fluid models.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Cardiac & Cardiovascular Systems
Vikas Thondapu, Daisuke Shishikura, Jouke Dijkstra, Shuang J. Zhu, Eve Revalor, Patrick W. Serruys, William J. van Gaal, Eric K. W. Poon, Andrew Ooi, Peter Barlis
Summary: Patient-specific coronary endothelial shear stress (ESS) calculations were performed using Newtonian and non-Newtonian rheological models. The non-Newtonian model estimated higher ESS values and offered additional information for detecting underlying atherosclerosis.
FRONTIERS IN CARDIOVASCULAR MEDICINE
(2022)
Article
Engineering, Chemical
Akapong Kongjaroen, Pawadee Methacanon, Chaiwut Gamonpilas
Summary: Rheological properties of thickened liquids from various commercial gum-based thickening powders were studied, showing that xanthan gum-based samples exhibited higher zero shear viscosity and longer relaxation time, behaving as weak gels with superior cohesiveness compared to guar gum and tara gum-based samples. The breakup time of these samples in extensional rheology was xanthan gum > guar gum > tara gum, indicating the superior cohesiveness of xanthan gum-based samples.
JOURNAL OF FOOD ENGINEERING
(2022)
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
Mechanics
Ali Rezghi, Ping Li, Junfeng Zhang
Summary: This article simulates the lateral migration process of a viscoelastic capsule in tube flow and investigates the effects of viscosity ratio, membrane shear viscosity, and capillary number on the migration dynamics. The migration process is characterized by an initial transient phase and a subsequent reduction in deformation and migration velocity. The capsule also undergoes continuous rotation during migration, which gradually slows down. The interior-exterior fluid viscosity and membrane viscosity have similar effects on reducing capsule deformation and inclination angle, while a high membrane viscosity may introduce significant oscillations in deformation, inclination, and migration velocity. The migration velocity and rotation period are found to be slower for capsules with higher viscosity contrast and/or membrane viscosity, and the influence of membrane viscosity becomes more pronounced at higher capillary numbers.
Article
Mechanics
Meisam Pourali, Martin Kroger, Jan Vermant, Patrick D. Anderson, Nick O. Jaensson
Summary: This study investigates the flow of viscous interfaces carrying an insoluble surface active material, exploring the complex interplay between Marangoni stresses, compressibility, and surface shear and dilatational viscosities. By conducting numerical simulations on particle probes, the relationship between drag and interfacial properties necessary for microrheology is quantified. The research reveals the intimate coupling between bulk and interfacial flows, demonstrating the effects of different physical factors on the velocity field and drag coefficient.
Review
Mechanics
Daniel De Kee
Summary: This paper contributes to the celebration of Professor R. B. Bird's career by reviewing the concept of yield stress and discussing models and experimental techniques for measuring yield stress. It also addresses the challenges associated with measuring very low yield stress in bio-fluids like blood.
Article
Environmental Sciences
David Wertheim, Gavin Gillmore, Ian Gill, Nick Petford
SCIENCE OF THE TOTAL ENVIRONMENT
(2017)
Article
Multidisciplinary Sciences
Nick Petford, Seyed Mirhadizadeh
ROYAL SOCIETY OPEN SCIENCE
(2017)
Article
Geochemistry & Geophysics
Tracy Rushmer, Nick Petford
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2011)
Article
Geochemistry & Geophysics
N. Petford, M. A. Koenders, S. Turner
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2008)
Article
Microscopy
A. P. M. Antunes, A. D. Covington, N. Petford, T. Murray, D. Wertheim
JOURNAL OF MICROSCOPY
(2013)
Article
Geosciences, Multidisciplinary
Nick Thompson, Matthew R. Bennett, Nick Petford
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2010)
Article
Geochemistry & Geophysics
B. Coldwell, J. Clemens, N. Petford
Article
Engineering, Geological
Nick Thompson, Matthew R. Bennett, Nick Petford
Article
Engineering, Industrial
Graham Manville, Fahri Karakas, Martyn Polkinghorne, Nick Petford
PRODUCTION PLANNING & CONTROL
(2019)
Article
Geochemistry & Geophysics
N. Petford, M. A. Koenders, J. D. Clemens
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2020)
Article
Geology
John D. Clemens, Paul A. Helps, Gary Stevens, Nick Petford
Summary: The Dartmoor pluton, formed around 280 million years ago, is composed of multiple sheets of granitic magma with diverse sources, including water-rich magmas. It exhibits variations in structure, chemistry, and isotopes. The main chemical changes are attributed to a combination of entrained peritectic plagioclase, orthopyroxene, and ilmenite, as well as local crystal fractionation, rather than simple mineral fractionation.
JOURNAL OF GEOLOGY
(2021)
Proceedings Paper
Nanoscience & Nanotechnology
Tracy Rushmer, Antoinette Tordesillas, David M. Walker, Nick Petford
POWDERS AND GRAINS 2013
(2013)
Article
Geochemistry & Geophysics
M. A. Koenders, N. Petford
GEOPHYSICAL JOURNAL INTERNATIONAL
(2007)
Article
Health Care Sciences & Services
Kathleen T. Galvin, Nick Petford, Frances Ajose, Dai Davies
JOURNAL OF MULTIDISCIPLINARY HEALTHCARE
(2011)