Article
Green & Sustainable Science & Technology
Yajin Lyu, Chang Xing, Li Liu, Jiangbo Peng, Wenkai Shen, Xin Yu, Penghua Qiu
Summary: This study experimentally investigated the influences of dilution rate and equivalence ratio on the flame characteristics of hydrogen-air micro-mixing combustion. The results showed that increasing the dilution rate reduces the flame area, while decreasing it generates more small-scale wrinkle structures.
Article
Nanoscience & Nanotechnology
Hyunje Park, Jaeseok Hwang, Tae Hyeong Lee, Jaejong Lee, Dae Joon Kang
Summary: The study focuses on secondary electrohydrodynamic instability in polymer films to produce easy-to-control morphological anisotropic wettability without the need for chemical modifications. Advantages of anisotropic hydrophilic surfaces fabricated by secondary phase instability of polymer films for droplet condensation and removal result in a higher efficiency in water harvesting applications compared to traditional hydrophilic surfaces.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Henrik M. Bette, Edgar Jungblut, Thomas Guhr
Summary: Modern utility-scale wind turbines utilize a SCADA system to collect vast amounts of operational data, which can be analyzed to enhance turbine maintenance and operation. In this study, we analyze high-frequency SCADA data from the Thanet offshore wind farm in the UK and evaluate Pearson correlation matrices to assess nonstationarity in data dependencies. Our findings indicate distinct correlation structures for different states, with wind speed being the main factor influencing these states. By modeling the boundary wind speeds and incorporating them into our analysis, we account for the nonstationarity and automate preprocessing for future data analysis.
Article
Physics, Fluids & Plasmas
Monica Basilio Hazas, Francesca Ziliotto, Massimo Rolle, Gabriele Chiogna
Summary: This study provides experimental evidence of the relationship between mixing and flow field topology in porous media. The model-based interpretation shows that changes in boundary conditions can affect mixing dynamics and Shannon entropy of tracer distribution. Despite variations in hydrodynamic dispersion coefficients, the mixing dynamics remain stable due to control by the Okubo-Weiss parameter.
Article
Astronomy & Astrophysics
Facundo Rodriguez, Manuel Merchan, M. Celeste Artale, Moira Andrews
Summary: Motivated by observational results, this study uses IllustrisTNG hydrodynamical numerical simulations to explore the alignment of central galaxies in groups with the surrounding structures. The results show that red central galaxies are more aligned with their groups compared to blue ones, and there is a strong dependence on the mass of the central galaxy. The alignment process is linked to halo assembly and the halo anisotropy-mass relationship.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Thermodynamics
Sak Jie Tan, Kok Hwa Yu, Junior Sarjit Singh Sidhu, Mohd Azmi Ismail
Summary: The paper examines the relationship between mixing length and mixing index for two streams of liquid mixing in a two-dimensional channel, proposing a new correlation for mixing length. The correlation is applicable for a specific range of mixing indices and is valid as long as laminar mixing flow prevails.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Environmental
Jia Meng, Chiranjeevi Kanike, Somasekhara Goud Sontti, Arnab Atta, Xiaoli Tan, Xuehua Zhang
Summary: This study investigates the effect of mixing dynamics on asphaltene precipitation using solvent exchange method, and reveals the significance of transportation process for the morphology of asphaltene precipitates through experimental and simulation studies.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Mechanical
Mahendra Prasad
Summary: This paper derives an analytical expression for the friction factor of a two-dimensional semicylindrical roughness using Navier-Stokes equation and mixing length theory. It compares this expression with the modified series mathematical representation of Haalands equation for friction factor.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Physics, Fluids & Plasmas
Jean-Luc Thiffeault, Jiajia Guo
Summary: The active Brownian particle model describes the behavior of swimmers whose direction is determined by a Brownian motion. In a two-dimensional model with nonthermal noise, there are modifications to the traditional ABP model. The fluctuating force causing a fluctuating torque leads to coupling between translational and rotational degrees of freedom in the diffusion tensor.
Article
Chemistry, Physical
Dae Woong Kim, Soo Bin Han, Yoon Sun Lee, Dong Yong Park, Ho-Jin Lee, Sung Hyuk Park, Hyejin Song
Summary: Additively manufactured austenitic stainless steel 316L consists of a cellular structure with directionality, exhibiting different morphologies depending on the observation direction. The morphology of the cellular structure that appears with high probability in grains with specific orientations is determined. The Taylor factor, influenced by grain orientation, is related to the cellular structure morphology and affects the mechanical properties, specifically the yield strength of additively manufactured SUS316L.
Article
Multidisciplinary Sciences
Jaideep Katuri, Ruben Poehnl, Andrey Sokolov, William Uspal, Alexey Snezhko
Summary: This study reveals unconventional motion states in ensembles of active discoidal particles powered by induced-charge electrophoresis. Through experiments and computational modeling, researchers demonstrate that the shape asymmetry of the particles promotes the formation of active particles' bound states, ultimately leading to a spontaneous collective state with arrested motility.
Article
Chemistry, Physical
Manoj Kumar, Anupam Singh, Benedetta Del Secco, Maksim Baranov, Geert van den Bogaart, Stefano Sacanna, Shashi Thutupalli
Summary: In this study, the use of colloid supported lipid bilayers (CSLBs) for assembling colloidal structures is explored. It is found that the curvature anisotropy of the colloids drives a sorting of the lipids in the membrane. This property is then utilized to create shape-anisotropic patchy colloids, which enables the directed assembly of colloidal links and opens up possibilities for creating heterogeneous and flexible colloidal structures.
Article
Engineering, Geological
Rao Zhang, Duruo Huang, Ning Liu, Feng Jin
Summary: The nonstationarity of ground-motion time histories has a significant impact on the nonlinear structural response and is difficult to realistically capture. In this study, a new method called ECSC-rho is developed to generate synthetic earthquake ground motions. The method uses wavelet-packet characterization and optimization to capture the time and frequency properties of acceleration time histories. The proposed method has advantages in simulating ground motions with prescribed nonstationarity, response spectra, and energy build-up processes.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Yulin Du, Yifan Lyu, Shiquan Li, Ding Ding, Jianghuai Chen, Cai Yang, Yang Sun, Fengli Qu, Zeyu Xiao, Jianhui Jiang, Weihong Tan
Summary: Cell-specific aptamers are a strong tool for studying membrane receptors at the single-molecule level. Ligand dilution analysis (LDA) is proposed as a random sampling-based strategy to study aptamer-based receptors. This strategy allows for the calculation of receptor density, colocalization and differentiation of aptamer and monoclonal antibody binding, and determination of binding site and aptamer-receptor binding mode.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Civil
Cuauhtemoc Tonatiuh Vidrio-Sahagun, Jianxun He
Summary: This study proposes a novel decomposition-based method for nonstationary flood frequency analysis and compares it with the commonly used performance-based approach. The results show that the decomposition-based method has advantages in preserving the moments of stochastic components and is competitive with the performance-based approach in capturing nonstationary stochastic processes.
JOURNAL OF HYDROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Ruth Maier, Carsten Leven, Emilio Sanchez-Leon, Daniel Strasser, Maximilian Stoll, Olaf A. Cirpka
Summary: The study estimates the hydraulic anisotropy of a stratified aquifer using data from hydraulic tests, revealing spatial variability and vertical heterogeneity in hydraulic conductivity.
HYDROGEOLOGY JOURNAL
(2022)
Article
Engineering, Environmental
Lucien Stolze, Maria Battistel, Massimo Rolle
Summary: This study investigates the oxidative dissolution of natural As-bearing sulfide minerals and the related release of arsenic under flow-through conditions. The results show that pore-water acidity controls the dissolution of sulfide minerals and the release of arsenic. The impact of surface passivation depends on flow velocity and the spatial distribution of reactive minerals.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Alraune Zech, Sabine Attinger, Alberto Bellin, Vladimir Cvetkovic, Gedeon Dagan, Peter Dietrich, Aldo Fiori, Georg Teutsch
Summary: The goal of this study is to recommend dispersivity values for modeling contaminant transport in groundwater based on a comprehensive analysis of field experiments. The study finds that macrodispersivity coefficients are related to the spatial variability of hydraulic conductivity in groundwater. In the absence of experimental data, practitioners often use ad hoc values for macrodispersivities.
Article
Water Resources
Florentin Hofmeister, Floriana Graziano, Giorgia Marcolini, Winfried Willems, Markus Disse, Gabriele Chiogna
Summary: This study examines hydrometeorological time series in two high-elevation Alpine catchments and identifies trends, change points, and inhomogeneities. The results show that these statistical properties of the time series can introduce uncertainty into hydrological model results, with inhomogeneities having a stronger influence on cryosphere processes than on runoff generation.
HYDROLOGICAL SCIENCES JOURNAL
(2023)
Article
Environmental Sciences
Marie-Madeleine Stettler, Marco Dentz, Olaf A. A. Cirpka
Summary: Macrodispersion in heterogeneous formations is caused by spatial variability of the velocity field. Differential advection interacts with diffusion to determine effective dispersion, while pure advection is reversible and diffusion is irreversible. We found that the reversibility of macrodispersion is bigger for ensemble dispersion than for effective dispersion, challenging the use of the latter as a metric of mixing.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Mohammad Alqadi, Ala Al Dwairi, Pablo Merchan-Rivera, Gabriele Chiogna
Summary: The article introduces a new software called DeMa, which aims to support wellfield managers in their decision-making processes. This software combines well maintenance, operation, design, installation, and cost data with hydrological field measurements, differentiating itself from other available software. DeMa also provides an effective graphical representation of the data by linking different information.
Article
Environmental Sciences
C. Strobel, S. Abramov, J. A. Huisman, O. A. Cirpka, A. Mellage
Summary: This study demonstrates the sensitivity of Spectral Induced Polarization (SIP) to microbially-driven changes in electrical charge storage under natural conditions. The results show that SIP can effectively monitor microbial activity and distinguish it from other polarization processes. This approach opens up new possibilities for in situ monitoring of system reactivity.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Water Resources
Riccardo Sprocati, Andrea Gallo, Marie Boeskov Caspersen, Massimo Rolle
Summary: Electrokinetic (EK) techniques show great potential for in situ subsurface remediation of organic and inorganic contaminants in porous media. However, the mechanisms governing EK applications in porous media are complex and involve various processes. This study investigates the interactions between density driven effects and electrokinetic transport in permeable porous media.
ADVANCES IN WATER RESOURCES
(2023)
Article
Engineering, Civil
J. Ashish Manoj, Teresa Perez Ciria, Gabriele Chiogna, Nadine Salzmann, Ankit Agarwal
Summary: Studies have shown that increased extreme precipitation does not directly lead to flooding. This study focuses on understanding the spatial and temporal patterns of the relationship between soil moisture and precipitation in Europe. By using an event-based analysis, the study quantifies the probability of soil moisture preceding precipitation and examines the statistical relationship between joint episodes of soil moisture and precipitation and reported flood events. The results highlight the importance of considering seasonality and interdependencies in flood risk mitigation and provide valuable insights for comprehensive flood risk assessment studies.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Henning Wienkenjohann, Biao Jin, Massimo Rolle
Summary: This study investigates the impact of diffusive-dispersive processes on isotope fractionation of organic contaminants in groundwater. Through experiments and simulations at different scales, the study demonstrates the significant influence of diffusive-dispersive processes on isotope signatures of chlorinated ethene plumes.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Riccardo Sprocati, Andrea Gallo, Henning Wienkenjohann, Massimo Rolle
Summary: This study investigates the effects of temperature on electrokinetic transport in porous media. The results show that an increase in temperature leads to a higher speed of amendments delivery and increased kinetics of degradation reactions. The simulations also reveal a feedback mechanism where higher aqueous conductivity results in increased Joule heating, leading to a faster temperature rise and higher electrolyte conductivity.
JOURNAL OF CONTAMINANT HYDROLOGY
(2023)
Article
Environmental Sciences
Monica Basilio Hazas, Francesca Ziliotto, Jonghyun Lee, Massimo Rolle, Gabriele Chiogna
Summary: This study investigates the effects of fluctuating surface water bodies on solute transport in aquifers. The results show that highly transient boundary conditions lead to a larger area, perimeter, and dilution of solute plumes. The study also identifies different regimes of dilution and reaction domination, characterized by increasing and decreasing plume entropies at different mixing ratios. Furthermore, reactive mixing is enhanced by transient flows, resulting in faster degradation of contaminant plumes compared to steady flow conditions.
JOURNAL OF CONTAMINANT HYDROLOGY
(2023)
Article
Environmental Sciences
Florentin Hofmeister, Brenda Rubens Venegas, Gabriel Sentlinger, Michael Tarantik, Theresa Blume, Markus Disse, Gabriele Chiogna
Summary: Salt dilution is a reliable method for measuring streamflow in creeks, especially downstream of turbulent flow sections. Manual measurements of salt dilution have limitations in observing rare peak flow events. An automated streamflow measuring system was used to overcome these limitations and detect changes in the rating curve caused by erosion and deposition processes. The system's reliability was evaluated using a large dataset and the primary sources of uncertainty were identified.
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Engineering, Environmental
Muhammad Muniruzzaman, Massimo Rolle
Summary: This study assesses the impact and relevance of microscale electrostatic effects on macroscopic contaminant transport in heterogeneous groundwater systems involving clay zones. The results show that electrostatic mechanisms within clay's diffuse layer can significantly affect contaminant migration, leading to different mass loading/release behaviors. It also emphasizes the significance of considering electrostatic processes in subsurface hydrology to accurately predict contaminant migration.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2023)
Article
Environmental Sciences
Jonas Allgeier, Olaf A. A. Cirpka
Summary: Modern physics-based subsurface-flow models often require many parameters and computationally costly simulations. To expedite the calibration process, we propose using surrogate models based on Gaussian Process Regression (GPR), which allows estimation of the posterior parameter distribution using Markov-Chain Monte Carlo (MCMC) simulations. We compared the GPR-based approach to a Neural Posterior Estimation (NPE) scheme and found that the GPR-based MCMC approach reproduced the data better.
WATER RESOURCES RESEARCH
(2023)