Article
Engineering, Chemical
Lian Duan, Zhixun Xia, Yunchao Feng, Binbin Chen, Likun Ma, Jianxin Hu
Summary: In this study, boron-magnesium agglomerates with varying mass ratios were prepared and the combustion process of these agglomerates under different oxygen-rich concentrations were investigated. The results showed that when the mass fraction of magnesium powder in boron-magnesium agglomerates exceeded a certain threshold, a transient flameout process occurred. This process is affected by the magnesium content of the agglomerate and the oxygen concentration in the ambient atmosphere.
Article
Engineering, Aerospace
Jay V. V. Evans, C. B. William Senior, Rohan M. M. Gejji, Carson D. D. Slabaugh
Summary: The influence of bypass air addition on the performance of a solid-fuel ramjet combustor was investigated. It was found that increasing the bypass ratio can lower the chamber pressure and increase the thrust, but at the expense of reducing the combustion efficiency. The maximum combustion efficiency was achieved at a bypass ratio of 15%.
JOURNAL OF PROPULSION AND POWER
(2023)
Article
Multidisciplinary Sciences
Jin-Tae Kim, Wei Ouyang, Hanul Hwang, Hyoyoung Jeong, Soohyeon Kang, Sanjeeb Bose, Sung Soo Kwak, Xiaoyue Ni, Hyeonsu Kim, Jaehong Park, Hope Chen, Alan Soetikno, Joohee Kim, Shuai Xu, Leonardo P. Chamorro, John A. Rogers
Summary: A study is summarized in this article that integrates the dynamics of flow and particles induced by speech sounds and the use of skin-integrated electronic systems. The study uncovers different regimes of particle motion and highlights the importance of measuring critical speech patterns using skin-interfaced wireless sensors.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Engineering, Chemical
Jan Oscar Pralits, Marco Atzori, Matteo Colli, Margherita Pettinato, Emanuela Drago, Patrizia Perego
Summary: In this work, time-resolved three-dimensional numerical simulations and laboratory experiments were performed to investigate the spray drying process. The simulations provided insights into the flow and particle dynamics, while the experiments validated the reliability of the simulations. The study highlighted the importance of unsteady and well-resolved simulations in understanding the impact of flow characteristics on particle trajectories and product quality.
Article
Mechanics
Zuoxu Li, Xiaowen Shan
Summary: A systematic approach of incorporating body force in the LBM for thermal compressible and non-equilibrium flows is proposed in this study. It is shown that the absence of the third-moment contribution of the force term leads to an erroneous heat flux quadratic in Mach number and linear in temperature variation. The theoretical findings are verified and the necessity of the third-moment contribution is demonstrated by numerical simulations.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Sergio da Cunha, Nataliya Shcherbakova, Vincent Gerbaud, Patrice Bacchin
Summary: This study simulates the diffusiophoresis process in non-electrolyte phoretic systems with consideration of certain constraints, and investigates the equilibrium and fully developed states. The simulation results reveal the dependence of equilibrium states on solute diffusivity and the reference solute concentration. The study also explores the effect of solute-interface interactions on diffusiophoresis and demonstrates particle separation through diffusiophoresis.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Pharmacology & Pharmacy
Sara B. E. Andersson, Goran Frenning, Goran Alderborn, Johan Grasjo
Summary: The aim of this study was to determine the thickness of the hydrodynamic diffusion layer (h(HDL)) of three poor water-soluble compounds under laminar fluid flow using a single particle dissolution technique. The study found a semi-quantitative concordance between experimental and simulated determined h(HDL) values, and established a theoretical relation between thickness and particle radius and flow velocity. The thickness was found to be independent of solubility but dependent on the diffusion coefficient.
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
(2022)
Article
Energy & Fuels
Fuliang Nie, Fengwu Bai, Zhifeng Wang, Ronggui Yang
Summary: The use of a downward particle flow in a quartz tube has been evaluated to eliminate particle loss associated with directly irradiated solid particle solar receivers (SPSR). A CPFD simulation showed that the thickness of the particle layer affects the distribution of axial particle velocities, with a thinner layer leading to more uniformity and higher average velocities. A thickness of 5 mm is recommended for optimal performance.
Article
Engineering, Chemical
Laleh Abdollahzadeh, Masoumeh Seyfi Mazraeno, Seyed Nezamedin Hosseini, Alireza Fazlali, Ehsan Soury, Mahmoud Habibian, Maryam Khatami
Summary: Biomass particle separation in the pharmaceutical industry is challenging due to the small size and light weight of the particles. This study introduced mini-hydrocyclones as a better solution for continuous processes, achieving a higher concentration of biomass suspension in the product compared to conventional batch separation techniques.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Engineering, Chemical
Mehrad Ansari, Heta A. Gandhi, David G. Foster, Andrew D. White
Summary: Computational fluid dynamics (CFD) analysis is widely used in chemical engineering. In this study, active learning (AL) and symbolic regression (SR) are combined to obtain symbolic equations for system variables from CFD simulations. This scalable approach is applicable for any desired number of CFD design parameters.
Article
Engineering, Chemical
Thomas P. John, Claudio P. Fonte, Adam Kowalski, Thomas L. Rodgers
Summary: In this study, an angular momentum balance combined with computational fluid dynamics was used to correlate the power, flow, and mixer geometry of down-pumping pitched blade turbine geometries. The models developed from the results allow the prediction of power from flow (or vice versa) for different geometries, and it was found that the choice of measurement method can affect the relationship between power, flow, and impeller geometry.
Article
Engineering, Chemical
Kirill Mikhaylov, Stelios Rigopoulos, George Papadakis
Summary: The study combines reduced order modeling and system identification to reconstruct the temporal evolution of large-scale vortical structures behind the blades of a Rushton impeller. The results demonstrate that even using the velocity time signal from a single sensor point, the first pair of modes can be reconstructed well. Increasing the number of sensor points improves accuracy and stability, leading to better reconstruction of the second pair of POD modes. The estimator derived at Reynolds number 600 shows robustness when applied to flows at Reynolds numbers 500 and 700.
Article
Energy & Fuels
Andrea Schirru, Tommaso Lucchini, Gianluca D'Errico, Marco Mehl, Thomas Hilfiker, Patrik Soltic
Summary: Dimethyl Ether (DME) is a promising fuel for heavy-duty transportation due to its similar properties to diesel, ability to reduce emissions, and potential for carbon neutrality. Numerical analysis of DME combustion process was conducted, validating the results against experimental data. The study showed the advantages of using DME in reducing emissions and improving efficiency in real-world applications.
Article
Engineering, Marine
Siddharth Gupta, Atul Sharma, Amit Agrawal, Mark C. Thompson, Kerry Hourigan
Summary: In this study, the effects of geometrical and kinematic parameters on the propulsive performance of hydrofoils were investigated. The results show that leading and trailing edge curvatures improve hydrofoil performance and stability, while increasing thickness decreases performance. The optimal conditions for maximum propulsion efficiency involve minimal flow separation without a separating vortex, while maximum thrust generation occurs with moderate flow separation without significant fluid induction around the trailing edge. These findings provide valuable insights for understanding fish propulsion efficiency and have practical applications in the design of autonomous underwater vehicles and micro-air vehicles.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Daolun Liang, Tianhua Xue, Weidong Zhong, Wen Ao, Ke Ren, Yangxu Jiang, Yang Wang, Dekui Shen
Summary: Magnesium particles with different average diameters were visually monitored during combustion using a laser ignition testing system. The results showed that the combustion phenomena and combustion time were affected by the particle diameter. Statistical analysis revealed average combustion times of 4.5 +/- 2.5 ms, 15.2 +/- 7.9 ms, and 31.7 +/- 17.9 ms for magnesium particles with diameters of 100, 150, and 200 micrometers, respectively. Additionally, a mathematical model considering particle movement and heat transfer was developed to describe the combustion process.
JOURNAL OF MARINE ENGINEERING AND TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Daolun Liang, Rui Xiao, Jianzhong Liu, Yang Wang
AEROSPACE SCIENCE AND TECHNOLOGY
(2019)
Article
Thermodynamics
Heping Li, Daolun Liang, Jianzhong Liu
Summary: Nano-carbides, especially nTiC, show promising potential as accelerants for boron oxidation in solid propellants, by reducing the initial oxidation temperature and increasing heat release. The action mechanisms of nano-carbides are complex, involving oxidation, gaseous product formation, boride generation, and oxide catalysis, which may lead to improved performance of B-based solid propellants in the future.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Physical
Heping Li, Daolun Liang, Minghui Yu, Jianzhong Liu, Yang Wang, Aimin Pang, Gen Tang, Xuefeng Huang
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Energy & Fuels
Yang Wang, Heping Li, Inigo Ortega-Fernandez, Xuefeng Huang, Bo Jiang, Daniel Bielsa, Elena Palomo
Summary: This paper studies a unique combination of solar thermal plants and microalgae bioreactor, utilizing a thermocline heat storage tank to stabilize the system. A theoretical model of the system is developed to assess the yearly performance, showing the feasibility of the proposed novel system under varying solar radiation conditions.
Article
Thermodynamics
Inigo Ortega-Fernandez, Ana Belen Hernandez, Yang Wang, Daniel Bielsa
Summary: This study investigates the use of a packed bed thermal energy storage system for small-scale concentrated solar power plants, aiming to improve dispatchability and cost-effectiveness. The system utilizes Magnetite ore as heat storage media and Delcoterm Solar E15 thermal oil as heat transfer fluid, demonstrating potential in thermal performance and affordability.
Article
Thermodynamics
Daolun Liang, Ke Ren, Zizhan Wu, Yangxu Jiang, Dekui Shen, Heping Li, Jianzhong Liu
Summary: Two oxygenated slurry fuels were prepared by blending nano-aluminum particles with ethanol and TPGME, respectively. Combustion characteristics of these fuels were investigated using a laser ignition testing system, showing different stages of combustion process and emission spectra of gas-phase intermediate products like Al, AlO, AlO2, and Al2O. Nano-Al/EtOH and nano-Al/TPGME blends displayed different emission spectral intensity and combustion time characteristics.
Article
Thermodynamics
Yang Wang, Wen Ao, Inigo Ortega-Fernandez, Daolun Liang, Heping Li, Bo Jiang, Xuefeng Huang, Daniel Bielsa
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Energy & Fuels
Daolun Liang, Jianzhong Liu, Qili Qiu
Article
Energy & Fuels
Yang Wang, Inigo Ortega-Fernandez, Heping Li, Xuefeng Huang, Bo Jiang, Daniel Bielsa
Proceedings Paper
Energy & Fuels
Inigo Ortega-Fernandez, Yang Wang, Mikel Duran, Erika Garitaonandia, Lucia Unamunzaga, Daniel Bielsa, Elena Palomo
SOLARPACES 2018: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS
(2019)
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)