Article
Nanoscience & Nanotechnology
Michael J. Abere, Robert V. V. Reeves, David E. Kittell, Catherine Sobczak, David P. Adams
Summary: This study utilizes inert-mediated reactive multilayers to decouple the thermodynamic and kinetic contributions to propagating wave stability in Co/Al multilayers. By depositing an inert product phase (B2-CoAl) within the mid-plane of reactant layers, spin instabilities arise, which leads to the determination of a stability criterion based on enthalpy loss. The physical significance of this criterion is explored.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Baolei Wu, Weiyuan Yu, Zhen Hu, Xuemin Sun
Summary: An FCC + BCC dual-phase solid solution structure high-entropy alloy (HEA) joint was successfully formed during self-propagating brazing using an Al/Ni nano-multilayer. The interdiffusion of atoms at the joint resulted in the formation of a solid solution zone. The joint exhibited improved shear strength and a transition from cleavage fracture to ductile fracture with the increment of external pressure.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Sijia Shen, Hongbo Li, Yanxiang Liang, Chuanyun Wang, Yunfei Li, Lingwei Yang
Summary: This study reveals that the chemical reactions of Ni/Al energetic multilayers can be triggered by ultrahigh compressive loads, leading to the formation of a stoichiometric NiAl phase. The key to trigger these reactions lies in the nucleation of NiAl grains at the atomic intermixing zones of Ni-Al interfaces, which is facilitated by the ultrahigh compressive loads.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Francesco Torre, Maria Carta, Paolo Barra, Alberto Cincotti, Andrea Porcheddu, Francesco Delogu
Summary: This study investigates the mechanochemical reactivity of Zn-S powder mixtures subjected to mechanical processing by ball milling, varying parameters such as chemical composition, collision energy, and temperature. It was found that ignition time is influenced by impact energy, number of milling balls, temperature, and powder mass. Experimental findings are interpreted with the help of a phenomenological kinetic model.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
O. Politano, A. S. Rogachev, F. Baras
Summary: This study focuses on reactive joining with Ni/Al nanocomposites produced by high energy ball milling and cold rolling. Molecular dynamics simulations were used to study the self-propagating reaction and investigate the elemental mechanics triggering propagation, finding that the dissolution of Ni in amorphous Al and the sustained crystallization of the B2-NiAl intermetallic compound contribute to the heat delivered during the process.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Junchen Li, Yu Wang, Xutao Huang, Chao Zhang, Junqiang Ren, Xuefeng Lu, Fuling Tang, Hongtao Xue
Summary: A new welding method of Al/Ni dissimilar metals using Al-Ni reactive nano-multilayers was studied to achieve effective bonding and improve mechanical performance. The tensile strength and Young's modulus of the bonded components varied with the atomic ratio of Al-Ni RNMLs, with the highest strength observed at an ignition temperature of 830 K.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Steven J. DiGregorio, Michael Martinez-Szewczyk, Subbarao Raikar, Mariana I. Bertoni, Owen J. Hildreth
Summary: This study furthered the research on reactive silver inks (RSI) metallization by investigating the impact of ink formula on consumption, cell performance, and adhesion. A scalable, high-throughput flexible needle contact printing approach was introduced to solve the issues associated with drop-on-demand printing. The best performing ink, consisting of silver acetate, ethylamine, and formic acid, achieved silver fingers with total resistivities of 3.1 mu omega center dot cm and contact resistivities of 3.2 m omega center dot cm2 when printed at 61 degrees C. This ink successfully metallized a full-sized 156 mm x 156 mm SHJ cell, showing that an optimized RSI can achieve similar performances to LT-SP while consuming 80-90% less silver.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Physics, Fluids & Plasmas
Clara del Junco, Andre Estevez-Torres, Ananyo Maitra
Summary: Spontaneous pattern formation in living systems is driven by the interplay between reaction-diffusion chemistry and active mechanics. In this study, a minimal model of coupling between reaction-diffusion and active matter is analyzed, revealing that the propagation of a front is maintained in active systems with distinct effects from different types of stress.
Article
Chemistry, Physical
Mostafa Baloochi, Deepshikha Shekhawat, Sascha Sebastian Riegler, Sebastian Matthes, Marcus Glaser, Peter Schaaf, Jean Pierre Bergmann, Isabella Gallino, Joerg Pezoldt
Summary: A two-dimensional numerical model was developed to study the self-propagating reactions in Al/Ni multilayer foils, showing that increased thermal conductivity of the final product leads to higher reaction front velocity, the effect of heat convection losses on reaction characteristics is insignificant, and higher initial temperature of the foils results in increased reaction front velocity and temperature.
Article
Mathematics, Applied
Daniel Escaff
Summary: This report investigates the interaction of self-propelled particles in a viscous and noisy environment. The study reveals that instead of flocking, the system forms two counter-propagating flocks due to the absence of global velocity polarization. These flocks lead to the formation of two counter-propagating clusters with short-range interaction, exhibiting behaviors similar to counter-propagating dissipative solitons. The analysis is based on mean-field strategies and is validated by numerical simulations.
Article
Psychology, Multidisciplinary
Lenie J. Torregrossa, Scott D. Blain, Matthew A. Snodgress, Sohee Park
Summary: This study investigates the embodiment of emotions in the schizophrenia spectrum and finds a correlation between negative schizotypy and patterns of emotional embodiment. Individuals with elevated negative schizotypy experience emotions with higher intensity but lower clarity, and they also report more incongruent bodily sensations of emotions.
FRONTIERS IN PSYCHOLOGY
(2023)
Article
Chemistry, Physical
Jaeseung Lee, Afroz Alam, Hyunchul Ju
Summary: A three-dimensional transient numerical model of an alkaline water electrolysis cell has been developed and experimentally validated. The simulation results show good agreement with measured data, revealing the operating characteristics and key distributions of AWE cells.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Physics, Applied
Cheng Luo, Yansong Zhang
Summary: A general method based on multi-channel heat flow induced by Joule heat is proposed to enhance the reaction temperature and velocity of self-propagating high-temperature synthesis simultaneously. This method leads to the formation of two combustion stages, resulting in a significant increase in the maximum reaction temperature and reaction velocity. The findings are expected to pave the way for future applications of self-propagating high-temperature synthesis in industries.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Arunabha M. Roy
Summary: This study has formulated a thermodynamically consistent multiphase phase-field theory to describe temperature-induced solid-solid phase transformations through an interfacial phase. The theory allows for analytical solutions of interface properties for propagating solid-melt and solid-solid interfaces. The study has focused on the formation of intermediate melt in HMX energetic crystal, analyzing the effect of a penalizing term and nanoscale material parameters on the appearance and degree of disordering of the intermediate phase for non-equilibrium interfaces.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Geosciences, Multidisciplinary
Lucas Schauer, Michael J. Schmidt, Nicholas B. Engdahl, Stephen D. Pankavich, David A. Benson, Diogo Bolster
Summary: This article presents a parallelized domain decomposition strategy for mass-transfer particle tracking methods. Different tiling techniques for two and three dimensions are investigated and an optimal tiling is determined based on problem parameters and the number of CPU cores. The efficiency of the parallelized algorithms is demonstrated with simulations of a pure diffusion problem.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2023)
Article
Thermodynamics
Yifan Yang, Haodong Zhang, Linye Li, Mingming Gu, Xi Xia, Fei Qi
Summary: This paper investigates the formation of a blue whirl by controlling tangential and radial airflows. By using a unique fire whirl apparatus, the blue whirl can be formed directly upon ignition without going through the transient phase. The study also discovers new flame regimes and explores the mechanism behind the formation and transition of the blue whirl.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Xiaobin Qi, Songyan Gao, Zhiping Zhu, Qinggang Lyu, Haixia Zhang
Summary: This study experimentally investigated the propagation characteristics of reverse combustion under oxygen-limited and enriched conditions. The contribution of volatiles gas-phase oxidation and char surface oxidation to reverse combustion was evaluated. The results showed that oxygen enrichment expanded the operating range of oxygen flow rate for reverse combustion and enhanced the low-temperature oxidation of the solid fuel. The findings provide a better understanding of the driving mechanism of reverse combustion and have important implications for efficient thermal conversion of solid fuels.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Bingjie Chen, Peng Liu, Bingzhi Liu, Zhandong Wang, Xiang Gao, William L. Roberts
Summary: In this study, the low temperature oxidation of 1,2,4-trimethylbenzene was investigated using experiments and numerical simulations. The results showed the presence of toxic oxygenated aromatic compounds and proposed potential formation pathways. The numerical simulations accurately predicted the mole fractions of most compounds, but some compounds were missing.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Meng Sui, Zhiheng Zhu, Fashe Li, Hua Wang
Summary: The effect of adding ferrocene as a combustion catalyst to Jatropha biodiesel on its pyrolysis and combustion performance is investigated. The results show that adding ferrocene reduces activation energy and harmful emissions while improving combustion efficiency.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Manaf Sheyyab, Mohammed Abdulrahman, Subharaj Hossain, Patrick T. Lynch, Eric K. Mayhew, Kenneth Brezinsky
Summary: Fuel surrogates, simplified representations of complex fuels, accurately model speciation results and reaction kinetics, reproduce the ignition quality and chemical functional group compositions of their parent fuels.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Yan Wang, Shumeng Xie, Hannes Bottler, Yiqing Wang, Xinyi Chen, Arne Scholtissek, Christian Hasse, Zheng Chen
Summary: This study investigates how flow affects the ignition and transition process of a cool flame. The results show that the ignition energy determines the highest temperature and the strain rate influences the flame propagation and the transition from cool flame to hot flame.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Tanusree Chatterjee, Mengyuan Wang, Goutham Kukkadapu, Chih-Jen Sung, William J. Pitz
Summary: Cycloalkanes, including cyclohexane, are important hydrocarbons in transportation fuels. However, limited oxidation data at low-to-intermediate temperatures and inadequate predictive ability of kinetic models have hindered the understanding and improvement of cyclohexane oxidation. This study provides experimental and modeling results to develop a more accurate kinetic model for cyclohexane oxidation.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Tao Wu, Erik Hagen, Haiyang Wang, Dylan J. Kline, Michael R. Zachariah, Carole Rossi
Summary: It was found that incorporating CuO into Al/I2O5 can significantly reduce the ignition time and enhance the combustion performance. The optimum composition of 80/20 wt% of I2O5/CuO shows a 30 times shorter ignition time and produces a peak pressure and pressurization rate 4 and 26 times greater than traditional Al/I2O5. A series of characterizations helped unravel the cause of improvement and propose a reaction mechanism for this ternary Al/I2O5/CuO system. This study proposes a facile, inexpensive, and efficient way to enhance the combustion performance of Al/I2O5 biocidal nanoenergetic materials.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Mahmoud Gadalla, Shervin Karimkashi, Islam Kabil, Ossi Kaario, Tianfeng Lu, Ville Vuorinen
Summary: In this study, the flame initiation process in dual-fuel spray assisted combustion is explored through scale-resolved simulations, providing numerical evidence on the initiation of premixed flames. It is found that there is a transient mixed-mode combustion phase after ignition, followed by a primarily deflagrative combustion mode. The interactions between turbulence and premixed flame front are characterized in the corrugated regime.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Neeraj Kumar Pradhan, Arindrajit Chowdhury, Debasis Chakraborty, Neeraj Kumbhakarna
Summary: In this study, a modified model for predicting the burn rate of composite solid propellants is proposed. The model has been validated against experimental and theoretical results, and it outperforms existing models in all cases considered. The model is highly robust and provides results quickly, making it highly efficient in terms of time, effort, and computational resources.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Lili Ye, Zhihe Zhang, Fan Wang, Xiaodong Wang, Yiming Lu, Lei Zhang
Summary: This study investigated the pyrolysis mechanism of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) explosive using ab initio and kinetic modeling simulations. The results showed that N-NO2 bond fission and C-H beta-scission are important channels in the decomposition of HMX.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Andrei N. Lipatnikov, Hsuchew Lee, Peng Dai, Minping Wan, Vladimir A. Sabelnikov
Summary: This study investigates the importance of thermodiffusive and hydrodynamic instabilities of laminar flames in turbulent flows through numerical simulations. The analysis suggests that laminar flame instabilities play a minor role at sufficiently high Karlovitz numbers.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Shijie Xu, Yue Qiu, Leilei Xu, Jianqing Huang, Shen Li, Elna J. K. Nilsson, Zhongshan Li, Weiwei Cai, Marcus Alden, Xue-Song Bai
Summary: Metal powder is a promising carbon-free and recyclable energy carrier. In this study, a computational model for the combustion and phase change of micron-sized iron particles was proposed and validated. The model successfully captures the melting, surface reactions, cooling, and solidification processes. The study also reveals a two-stage solidification phenomenon and identifies a diffusion-controlled mechanism during the melting process. The reaction between iron and CH4/O2/N2 flame products is found to play a significant role in the iron combustion process.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Khalid Aljohani, Abd El-Sabor Mohamed, Haitao Lu, Henry J. Curran, S. Mani Sarathy, Aamir Farooq
Summary: This study investigates the impact of exhaust gas recirculation (EGR) and NOx on the ignition delay time of oxygenated gasoline. A gasoline surrogate model is developed and the experimental data are useful for predicting fuel ignition behavior in internal combustion engines. The results show that EGR inhibits gasoline reactivity, while NOx has a promoting effect at high temperatures. This research is important for understanding the combustion behavior of gasoline in engines.
COMBUSTION AND FLAME
(2024)
Article
Thermodynamics
Chengcheng Ao, Jia Yan, Tong Yan, Lidong Zhang, Pan Wang
Summary: This study investigates the inhibitory effect of ammonia blended with hydrocarbon fuels on soot formation. The results show that there is a chemical interaction between ammonia and polycyclic aromatic hydrocarbons (PAHs), blocking the formation of larger PAHs.
COMBUSTION AND FLAME
(2024)