Article
Engineering, Mechanical
Hassan Khaleghi, Hossein Farani Sani, Masoud Ahmadi, Faezeh Mohammadzadeh
Summary: This paper examines the importance of turbulence effects on the secondary breakup of droplets, showing that turbulence intensity significantly affects the critical Weber number. The study reveals that turbulence causes droplets to break earlier, leading to faster evaporation rates and shorter spray tip penetration lengths. Additionally, the research suggests that as gas pressure increases, the disparity between results from models with and without turbulence effects diminishes, indicating a decreased impact of turbulence at higher gas pressures.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2021)
Article
Mechanics
Lijie Sun, Shiji Lin, Bo Pang, Yile Wang, Erqiang Li, Xiaotao Zu, Kai Zhang, Xia Xiang, Longquan Chen
Summary: This study experimentally investigates atomization phenomena occurring in impinging water droplets on superhydrophobic meshes. The spray formed during droplet recoiling is stimulated by air cavity collapse on the mesh, while the water spray produced during droplet spreading is expelled under inertia-induced hydrodynamic pressure. The size of the spray formation area on the mesh exhibits different behaviors in recoiling and spreading stages, with a power-law dependence on the Weber number.
Article
Mechanics
Zhanyuan Wang, Wanhui Zhao, Lei Zhou, Gequn Shu, Haiqiao Wei
Summary: In this study, molecular dynamics simulations were used to analyze the thermodynamic behavior of binary ethanol/hexadecane droplets under supercritical nitrogen environments. The droplets undergo a bulging-to-shrinking process during the transition from subcritical to supercritical state, and the fluids inside the droplets transform from vapor phase to liquid phase. The evolution types of the droplets were classified into micro-explosion, puffing, and mixing types based on the pressure condition.
Article
Energy & Fuels
Ping Yi, Tie Li, Yunpeng Fu, Siyu Xie
Summary: The study focuses on the micro-explosion of blended ethanol-diesel droplets under diesel engine-like conditions, using a model to predict the bubble generation, growth, and explosion process. It is found that the heat transfer rate and superheat limit are predominant factors under low pressures, while the competition among evaporation rate, heating rate, transcritical transition, and bubble growth rate determines the micro-explosion under higher pressures.
Article
Thermodynamics
Jiangping Tian, Xiaolei Zhang, Zechuan Cui, Mingyuan Ye, Yang Wang, Tiancheng Xu, Pengbo Dong
Summary: This study investigated the diesel/ammonia diffusion combustion mode and the impact of injection parameters on combustion performance. The results showed that injecting ammonia on diesel flame improved ammonia combustion completeness, while injecting ammonia before diesel resulted in incomplete combustion. Increasing ammonia injection pressure and nozzle diameter enhanced combustion performance, but excessive ammonia spray caused incomplete combustion. Interaction between diesel spray and ammonia spray was also observed.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Energy & Fuels
Ahmet Alper Yontar, Ayse Gizem Ozguner, Mehmet Ali Adiguzel, Deniz Ustun
Summary: This study investigates the droplet characteristics and combustion behavior of diesel and trimethyl borate fuels. The results show that increasing the diesel content in the fuel blends leads to significant changes in droplet shape, lower flame temperature, and longer burning time. The addition of trimethyl borate reduces ignition delay, shortens extinction time, and increases temperature during combustion compared to diesel.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
Article
Energy & Fuels
Yijie Wei, Tie Li, Run Chen, Xinyi Zhou, Zhifei Zhang, Xinran Wang
Summary: This study investigated the gas entrainment process in the breakup length of diesel spray using the high-speed micro-PTV technique. The experimental results showed that the gas entrainment velocity increased with higher injection pressure, while ambient density had no significant impact on the entrainment velocity. The study also proposed a theoretical 0-D model to estimate the cumulative gas entrainment rate during the quasi-steady state, which was validated with the experimental results.
Article
Thermodynamics
Tiemin Xuan, Noud Maes, Jose M. Garcia-Oliver, Daiana De Leon-Ceriani, Leonardo Pachano, Zhixia He
Summary: Experimental and numerical studies were conducted to investigate the effects of different split injection strategies on the soot characteristics of Spray A flames. The results showed that the ignition delay and soot production of the second injection pulse were shorter and higher, respectively, than those of the first one. The experimental soot production had a slight change when the dwell time was varied. The CFD analysis revealed that the duration of the first injection had no effect on the experimental soot production of the second pulse. However, the CFD results highlighted the important effects of end-of-injection wave propagation and combustion recession on the ignition and soot production of the second pulse.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Xinyi Zhou, Tie Li, Zheyuan Lai, Shuai Huang
Summary: This article analyzes the scaling relationship between small and large bore diesel engines, as well as the application of split injection strategies. It is found that all three scaling rules can effectively scale the injection rate and mass, with the pressure rule being better for scaling spray tip and tail penetrations.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Energy & Fuels
Yifei Gong, Guowei Xiao, Xiao Ma, Kai Hong Luo, Shijin Shuai, Hongming Xu
Summary: This study investigated the phase transition processes of different hydrocarbon mixtures under supercritical conditions, proposing a new criterion for determining the transition of mixing modes. The results showed that ambient pressure and temperature significantly influenced the dominant mixing mode transition.
Article
Energy & Fuels
Lei Zuo, Junfeng Wang, Deqing Mei, Dongbao Wang, Haojie Xu, Jiang Yao, Kai Yu, Jian Gao
Summary: Experimental research was conducted to investigate the effect of vertical electric fields on the combustion behaviors of ethanol, biodiesel, and diesel droplets. The competition between electric field force and natural buoyancy controlled the flame morphology, with different flame heights variations observed for the three fuels as the electric field strength increased. This study provides insights into droplet combustion in electric fields and electrospray combustion.
Article
Thermodynamics
Siyu Xie, Yunpeng Fu, Ping Yi, Tie Li, Run Chen
Summary: The transitional behavior of multi-component sprays under ECN Spray-A conditions has been investigated using numerical methods in this study. The development and implementation of robust thermodynamic equilibrium solvers and multi-component droplet evaporation models in OpenFOAM have led to new insights. The results indicate that dilute sprays are more prone to transitioning to the supercritical mixing regime, while dense sprays experience a decrease in trans-critical possibility before the end of injection due to the cooling effect of extensive evaporation. Additionally, it was found that multi-component diesel sprays are more likely to transition to the supercritical regime than n-dodecane sprays due to their low mixture critical temperature and evaporation rate.
APPLIED THERMAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Anindita Dasgupta, Joran Deschamps, Ulf Matti, Uwe Huebner, Jan Becker, Sebastian Strauss, Ralf Jungmann, Rainer Heintzmann, Jonas Ries
Summary: Supercritical angle localization microscopy (SALM) allows the z-positions of single fluorophores to be extracted from the intensity of supercritical angle fluorescence. The authors improve the z-resolution of SALM and report nanometer isotropic localization precision on DNA origami structures.
NATURE COMMUNICATIONS
(2021)
Article
Thermodynamics
Ahmet Alper Yontar, Duygu Sofuoglu, Huseyin Degirmenci, Tahir Ayaz, Deniz Ustun
Summary: This study used a high-speed camera and a thermal camera to observe the evolution of fuel droplet diameter, flame structure, and maximum flame temperature over time. Traditional fuels (diesel and gasoline) and new generation fuels (triethyl borate and trimethyl borate) were investigated. It was found that diesel and gasoline fuel droplets have a large non-luminous region in the flame structure, unlike triethyl borate and trimethyl borate fuels. The time-dependent variation of the droplet diameter generally followed the D2-law. The flame formed by trimethyl borate had the highest temperature and the shortest burning time.
Article
Biochemistry & Molecular Biology
Da Yeon Cheong, Wonseok Lee, Insu Park, Jinsung Park, Gyudo Lee
Summary: In this study, the nucleation and formation process of lysozyme amyloid fibrils were observed using a microfluidic system. It was found that the lag phase of amyloid nucleation and growth can be reduced by using smaller droplet volumes. Furthermore, a peculiar phenomenon of high amyloid formation at the edge of droplets was discovered, and it was observed that fibrils synthesized in nanoliter droplets are shorter and thicker compared to those synthesized via conventional heating method.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Thermodynamics
Raul Payri, Jose M. Garcia-Oliver, Tiemin Xuan, Michele Bardi
APPLIED THERMAL ENGINEERING
(2015)
Article
Mechanics
J. Manin, M. Bardi, L. M. Pickett, R. Payri
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2016)
Article
Energy & Fuels
Raul Payri, Jaime Gimeno, Michele Bardi, Alejandro H. Plazas
Article
Energy & Fuels
Vicente Macian, Raul Payri, Santiago Ruiz, Michele Bardi, Alejandro H. Plazas
Article
Thermodynamics
Raul Payri, Jose M. Garcia-Oliver, Michele Bardi, Julien Manin
APPLIED THERMAL ENGINEERING
(2012)
Article
Thermodynamics
Jesus Benajes, Raul Payri, Michele Bardi, Pedro Marti-Aldaravi
APPLIED THERMAL ENGINEERING
(2013)
Article
Engineering, Mechanical
V. Macian, R. Payri, A. Garcia, M. Bardi
EXPERIMENTAL TECHNIQUES
(2012)
Article
Thermodynamics
F. Payri, R. Payri, M. Bardi, M. Carreres
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2014)
Article
Thermodynamics
Michele Bardi, Guillaume Pilla, Xavier Gautrot
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2019)
Article
Energy & Fuels
Michele Bardi, Angela Di Lella, Gilles Bruneaux
Article
Thermodynamics
Noud Maes, Scott A. Skeen, Michele Bardi, Russell P. Fitzgerald, Louis-Marie Malbec, Gilles Bruneaux, Lyle M. Pickett, Koji Yasutomi, Glen Martin
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
Vincent Giuffrida, Michele Bardi, Mickael Matrat, Anthony Robert, Guillaume Pilla
Summary: This paper investigates the chemistry of O-3 in a compression ignition engine with Diesel type combustion using 3D CFD simulation. The proposed methodology, which includes 0D and 3D simulations, accurately captures the impact of O-3 on ignition delay and heat release. The study shows that O-3 mainly affects the LTHR phase of the combustion process and does not influence the topology and propagation of the flame inside the combustion chamber.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Engineering, Multidisciplinary
A. Kopf, M. Bardi, E. Kohler, T. Endres, G. Bruneaux, C. Schulz
Summary: This study investigates the survivability of two thermographic phosphors, YAG:Pr3+ and SMP:Sn2+, in a combustion environment. While YAG:Pr3+ can be used for in situ temperature measurements above the flame, SMP:Sn2+ cannot be detected under any reaction conditions within the flame's stability limits. Analysis of phosphor particles recaptured above the flame shows no alteration in YAG:Pr3+, but changes in morphology and chemical composition of SMP:Sn2+ result in loss of its luminescence properties.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Transportation Science & Technology
Christopher Kim Blomberg, Dimitnos Mitakos, Michele Bardi, Konstantinos Boulouchos, Yuri M. Wright, Annelies Vandersickel
SAE INTERNATIONAL JOURNAL OF ENGINES
(2016)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.