Article
Mechanics
Zhongyu Zheng, Xinliang Xu, Yuren Wang, Yilong Han
Summary: This study investigated the hydrodynamic interactions of two colloidal ellipsoids sediment in channels, revealing the critical role of confinement extent and particle shape anisotropy in anomalous hydrodynamic and diffusive behaviors. The findings suggest that negative rotation-rotation coupling and positive translation-rotation coupling are key characteristics of ellipsoid interactions. Additionally, a simple model proposed in this study has successfully reproduced some coupling phenomena observed between the ellipsoids, further confirmed by low-Reynolds-number hydrodynamic simulation.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Physical
Lorenzo Turetta, Marco Lattuada
Summary: The aggregation kinetics of sedimenting colloidal particles under fully destabilized conditions has been investigated using different methods. It has been observed that long-range hydrodynamic interactions are crucial in capturing the fast aggregation rates induced by increasing cluster mass, while simulations without long-range hydrodynamic interactions are unable to predict this rapid kinetics. Additionally, a gel point can be formed at high particle volume fractions and a decrease in anisotropy of resulting clusters is observed as the Peclet number increases.
Article
Chemistry, Physical
Yu-Fan Lee, Yimin Luo, Tianyi Bai, Scott C. Brown, Norman J. Wagner
Summary: Research on shear thickening colloidal suspensions demonstrates that measurements of the microstructure can elucidate the source of the rheological material properties. Neutron scattering methods have been used to resolve the longer-length scale microstructure in the shear thickened state. These findings provide experimental evidence and guidance for theoretical investigations.
Article
Mechanics
Pijush Patra, Donald L. Koch, Anubhab Roy
Summary: In this article, we study the collision behavior of particles in a gaseous medium, considering the effects of van der Waals attraction and non-continuum hydrodynamics in a simple shear flow. We find the influence of continuum lubrication forces and attractive interactions, as well as the significance of non-continuum interactions, and calculate the collision efficiency.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Emma Gonzalez, Christian Aponte-Rivera, Roseanna N. Zia
Summary: In this study, a computational investigation was conducted on the equilibrium dynamics of a polydisperse hard-sphere colloidal dispersion confined in a spherical cavity. The results showed that although polydispersity tends to homogenize structure in a suspension, strong correlations induced by the cavity resist this homogenization. The effects of polydispersity on particle dynamics were found to weaken lubrication effects near the cavity wall and drive diffusivity changes by affecting many-body hydrodynamic couplings.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Arghyadeep Paul, N. R. Aluru
Summary: The study investigates the impact of nonlocal shear stress on gravity-driven isothermal flow in nanochannels under strong confinement. The local average density model is used and the fluid's viscosity kernel is estimated using the sinusoidal transverse force method. A continuum model is proposed to solve the nonlocal hydrodynamics problem and its solutions are qualitatively compared with the results of non-equilibrium molecular dynamics simulations.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Han Lin, Madhu Majji, Noah Cho, John R. Zeeman, James W. Swan, Jeffrey J. Richards
Summary: Electrical transport in semiconducting and metallic particle suspensions is crucial for emerging grid-scale battery technologies. However, a universal framework to explain the transport process has not yet been established. This study investigates the significant contribution of shear flow to the electrical transport of non-Brownian suspensions. The findings show that the transport rate of these suspensions strongly depends on the particle volume fraction and applied shear rate, allowing the conductivity to be dynamically modified over 107 decades. Experiments and simulations suggest that the transport process relies on a combination of charge and particle diffusion, with the particle self-diffusion playing a key role.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Mechanics
Yu-Fan Lee, Kevin Whitcomb, Norman J. J. Wagner
Summary: Novel measurements of the spatiotemporal microstructure of a continuous shear thickening colloidal suspension under shear cessation and reversal using small angle neutron scattering in a 1-2 shear cell are presented. The study reveals a two-step relaxation mechanism during shear cessation experiments, where particles first readily diffuse on a characteristic timescale of single particle Brownian motion, followed by slower relaxation dynamics dominated by caging effects. In shear reversal experiments, the persistence of hydroclusters without transitioning through the equilibrium structure suggests the presence of distinct microstructural features.
Article
Mechanics
Benjamin E. Dolata, Roseanna N. Zia
Summary: The paper establishes a duality between Faxen formulas and singularity solutions, extending it to systems with coupled transport processes. By using energy methods instead of boundary conditions, the complexity of problem-solving is reduced. The reciprocal relation between operators shows that the Faxen/singularity duality is a consequence of generalized reciprocal relation between conjugate thermodynamic variables.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Chemical
Deepak Mangal, Jacinta C. Conrad, Jeremy C. Palmer
Summary: The study found that steric and hydrodynamic interactions hinder particle diffusivity under quiescent conditions and enhance longitudinal dispersion under flow. Additionally, the presence of hydrodynamic interactions leads to a power-law increase in the longitudinal dispersion coefficient with Pe due to spatial variations in the fluid velocity. Furthermore, simulations revealed that longitudinal particle dispersion coefficients behave similarly in 2D and 3D when hydrodynamic interactions are included.
Review
Microbiology
Luciana C. Gomes, Filipe J. M. Mergulhao
Summary: Biofilm development has significant impacts in environmental, industrial, and biomedical settings, and laboratory biofilms resembling those found in natural or man-made settings are needed for more effective biofilm control strategies. Knowledge of flow characteristics in different environments is essential for understanding microbial adhesion and biofilm formation.
Article
Mechanics
Wenqi Lyu, Xiaoming Wang
Summary: The study shows that the Stokes-Darcy system can be retrieved from the Helmholtz minimal dissipation principle. It is established that the interfacial boundary conditions, such as continuity of normal velocity and Beavers-Joseph-Saffman-Jones (BJSJ) condition, are accepted in mathematics community. These conditions are consistent with continuity of pressure across the interface in the physically important small-Darcy-number regime.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
S. Athani, B. Metzger, Y. Forterre, R. Mari
Summary: We investigated the transient dynamics of a sheared suspension of neutrally buoyant particles in pressure-imposed rheology configuration. The results showed that the early stress response of the suspension may differ strongly from the prediction of the suspension balance model based on the steady-state rheology. A two-phase model incorporating the Reynolds-like dilatancy law was able to capture the suspension dilation/compaction quantitatively. The study also revealed that the early stress response of the suspension is non-local, with a non-local length scale that scales with the particle size and diverges algebraically at jamming.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Francesco Romano, Pierre-Emmanuel des Boscs, Hendrik C. Kuhlmann
Summary: By analyzing the force and torque balances, the slow motion of a small buoyant sphere near a right dihedral corner made by tangentially sliding walls is studied, revealing different dynamical regimes and the existence of a non-trivial line attractor/repeller detached from the walls.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Multidisciplinary Sciences
Wenyu Zhao, Shaoxin Wang, Sudi Chen, Zuocheng Zhang, Kenji Watanabe, Takashi Taniguchi, Alex Zettl, Feng Wang
Summary: Thermally excited electrons and holes form a quantum-critical Dirac fluid in ultraclean graphene. The electrodynamic responses of this fluid are described by a universal hydrodynamic theory. Researchers observed the presence of a hydrodynamic plasmon and energy wave in ultraclean graphene using on-chip terahertz spectroscopy technique. These findings open up new opportunities to explore collective hydrodynamic excitations in graphene systems.
Review
Biotechnology & Applied Microbiology
Andreas Reiner Laible, Anna Dinius, Marcel Schrader, Rainer Krull, Arno Kwade, Heiko Briesen, Stefan Schmideder
Summary: Filamentous microorganisms are used as molecular factories in industrial biotechnology, and a new approach called microparticle-enhanced cultivation (MPEC) has been introduced to improve productivity. Studies have shown that microparticles have effects on culture broth, filamentous morphology, and molecular biology, with metal oxide particles interacting strongly with their environment and affecting gene regulation, metabolism, and enzyme activity. Further understanding of the interactions between particles and cells can help improve microbial cultivation technology.
ENGINEERING IN LIFE SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Peter Michael Bandelt Riess, Heiko Briesen, Daniel Schiochet Nasato
Summary: The systematic study of the effect of added wall support on granular bed porosity, simulated through discrete element method, shows that the porosity increase is proportional to the incorporated wall support, with the combination of cylindrical and angular inserts displaying the greatest effect (up to 26% increase). Sinusoidal porosity values near the walls are exhibited to clarify the effects, and the method presented could lead to filtration process improvements.
Article
Physics, Multidisciplinary
Zhiyuan Zhao, Mingcheng Yang, Shigeyuki Komura, Ryohei Seto
Summary: Previous studies have shown that nonzero odd viscosity is essential for chiral active fluids. This study reports the existence of such odd viscosity in suspensions of non-active or non-externally-driven chirally-shaped particles. Computational simulations are used to study dense ratchets in different flow conditions and show that the ratchet suspension has intermediate viscosity compared to suspensions of smooth and gear-like particles. In addition, the ratchet suspensions exhibit mixed features of conventional complex fluids and chiral viscous fluids based on the even and odd components of the first normal stress coefficient.
FRONTIERS IN PHYSICS
(2022)
Article
Engineering, Chemical
Simon A. Schiele, Rolf Meinhardt, Tiaan Friedrich, Heiko Briesen
Summary: This article investigates the interaction between crystal growth and abrasion on crystal shape and discusses the potential misinterpretation of experimental data due to neglecting crystal shape.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Computer Science, Interdisciplinary Applications
Philip Pergam, Heiko Briesen
Summary: This study aims to improve the computational efficiency of a complex mathematical cake-filtration model with strong nonlinearities. A hybrid data-driven approach using proper orthogonal decomposition is employed, and optimal, globally defined basis functions are found based on a few sample simulations. The reduced-order model obtained from this approach has a 98% decrease in dimension compared to the full-order model, resulting in a 90% decrease in computational time for solving a benchmark optimization problem. This significant numerical speed-up offers the potential to use the reduced-order model in advanced process control and optimization methods.
COMPUTERS & CHEMICAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Verena Bernadette Pannusch, Lukas Viebahn, Heiko Briesen, Mirjana Minceva
Summary: Supercritical fluid extraction from hops extracts essential oil that can be used for the flavoring of beer. This study analyzes and models the extraction kinetics of seven oil components under different pressure and temperature conditions. The results show that the internal-mass-transfer-control (IMTC) model effectively describes the extraction kinetics and can be used for predicting extract composition at different pressures and temperatures.
Article
Engineering, Chemical
Simon Alexander Schiele, Ramona Bier, Albin Ommert, Heiko Briesen
Summary: Due to the complex nature of crystallization processes, it is difficult to control them effectively. However, this study proposes a new method called direct crystal growth control (DGC), which avoids the need for thermodynamic parameterization. Instead, a single crystal is used as an analogue twin to measure the growth rate and serve as a proxy for the suspended crystals. By manipulating the temperature, the growth rate of the analogue twin can be kept constant, resulting in a constant growth rate for the suspended crystals. Further exploration of the hydrodynamic conditions is needed for accurate application of DGC.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Yvonne Kohl, Michelle Mueller, Marielle Fink, Marc Mamier, Siegfried Fuertauer, Roland Drexel, Christine Herrmann, Stephan Daehnhardt-Pfeiffer, Ramona Hornberger, Marius I. Arz, Christoph Metzger, Sylvia Wagner, Sven Saengerlaub, Heiko Briesen, Florian Meier, Tobias Krebs
Summary: In this study, a 96-well exposure system for nanomaterial safety assessment is developed and characterized using a lung epithelial model in an air-liquid interface. Sequential nebulization is applied to ensure reproducible distribution. Sequential exposure studies with different substances are conducted, followed by quantification of mass deposition and cell viability. This exposure system offers the possibility of high-throughput rates and sequential dosing, generating more reliable cell-based assay data for safety analysis of chemicals, drugs, and nanomaterials.
Article
Multidisciplinary Sciences
Yujie Jiang, Ryohei Seto
Summary: Using simulations, the authors identify the interplay between two lengthscales that generically controls gelation in composite gels. Composite gels, which consist of gel and non-sticky inclusions, are more commonly encountered in reality. Numerical simulations show that the non-sticky particles confine gelation in terms of an effective volume fraction and introduce another competing lengthscale. The ratio of these two lengthscales controls the effects in colloidal composites.
NATURE COMMUNICATIONS
(2023)
Article
Crystallography
Cornelia Eder, Simon A. Schiele, Frederik Luxenburger, Heiko Briesen
Summary: The integration of a flow-through cell into a Mach-Zehnder interferometer allows for detailed study of crystal dissolution, measuring the displacement velocity of a specific crystal facet and the solute concentration distribution in real time. The setup was successfully used to observe disintegration and mass transfer separately, improving predictions of active pharmaceutical ingredient bioavailability.
Article
Biotechnology & Applied Microbiology
Marcello Nussbaumer, Daniel van Opdenbosch, Max Engelhardt, Heiko Briesen, Tanja Karl
Summary: Mycelium composites have gained attention as potential substitutes for fossil-based plastics, particularly EPS. However, there is limited research on the combinations of fungi and lignocellulosic waste. This study explores the properties of mycelium composites produced with two white rot fungi and beech wood sawdust, highlighting the importance of fungal species selection and post-processing options.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Biotechnology & Applied Microbiology
Henri Mueller, Charlotte Deffur, Stefan Schmideder, Lars Barthel, Tiaan Friedrich, Lukas Mirlach, Joerg U. Hammel, Vera Meyer, Heiko Briesen
Summary: Filamentous fungi are capable of producing a wide range of biotechnological compounds. By utilizing synchrotron radiation-based X-ray microtomography, we were able to obtain highly resolved 3D micro-morphological analysis of submerged cultivated fungal pellets. This analysis provided detailed information about the number and density of spores, tips, branching points, and hyphae, thereby allowing us to monitor the growth of these fungal pellets in great detail for the first time.
BIOTECHNOLOGY AND BIOENGINEERING
(2023)
Article
Chemistry, Physical
Airi N. Kato, Yujie Jiang, Wei Chen, Ryohei Seto, Tao Li
Summary: The study shows that colloidal particles can be trapped at a liquid interface, reducing the interfacial area. Colloids with rough surfaces undergo various self-assemblies and structural transitions. Experimental and numerical simulations reveal that sufficiently rough systems exhibit a gel state between gas-like and close-packed jamming states. Roughness-induced friction and tangential contact forces contribute to the formation of gel state and collapse of compressed monolayer.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
B. M. Woerthmann, A. Hoffmann, J. Gerber, T. Wittkamp, H. Briesen
Summary: The hot-melt coating process is widely used in the food and pharmaceutical industries to change the functional properties of particle surfaces, form a protective layer, or influence the release rate of encapsulated substances. This study focuses on evaluating the interparticle batch homogeneity and comparing it with alternative methods for coating quality analysis. The results show that a process temperature of 40 degrees C has the most favorable effect on interparticle batch homogeneity, while spray rates between 3 and 20 g/min have minimal influence.
Article
Food Science & Technology
Benedikt K. L. Schmieder, Verena B. Pannusch, Lara Vannieuwenhuyse, Heiko Briesen, Mirjana Minceva
Summary: This study systematically investigated the influence of coffee grinding, water flow rate, and temperature on the extraction kinetics of espresso coffee components. The analysis revealed that flow rate had the strongest effect on the component mass in the cup, especially at finer grindings and higher water temperatures. Overall, the observed influences were minor compared to changes resulting from differences in total extracted espresso coffee mass.