RENEWABLE ENERGY
·
2020
·
IF 6.274
Hao Chen,Xin Su,Jingjing He,Peng Zhang,Hongming Xu,Chenglong Zhou
Cyclopentanol is a promising alternative biofuel for automobiles. In this study, an optical engine was employed to investigate the effects of cyclopentanol blending ratios on combustion characteristics. Cyclopentanol was blended with diesel by 10% and 20% volume, denoted as CP10 and CP20, respectively. Comparison tests between blends and diesel (denoted as D100) were performed under three injection pressures (100, 120, and 140 MPa) and four injection timings (−6°, −9°, −12° and −15° crank angle after top dead center (°CA ATDC)). The experimental results indicated that the addition of cyclopentanol prolongs the ignition delay , shortens the combustion duration and improves the indicated thermal efficiency . As the injection pressure increases or the injection timing advances, the peak combustion pressures (PCPs) and peak heat release rates (PHRRs) increase. Compared to D100, the PCPs and PHRRs of cyclopentanol/diesel fuel blends are lower and decrease with the increase of cyclopentanol ratio. Blending cyclopentanol in diesel is effective in reducing soot emission, and the reduction effect weakens as the injection pressure increases or the injection timing advances. CP10 is superior to CP20 according to the comprehensive evaluation of combustion and emission, especially at the injection timing of −12°CA ATDC under the injection pressure of 140 MPa.
研究领域:
能源科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
·
2016
·
IF 2.183
Xinming Huo,Fei Tang,Jin Chen,Xiaohua Zhang,Xiaohao Wang
The rectilinear ion trap (RIT) has always been one of the ideal candidates for mass analyzer miniaturization because of its simple configuration. In this work, the effect of the ejection-slit dimensions on the ion ejection efficiency of a miniature rectilinear ion trap (mRIT) with full-scale dimensions of 5 mm × 4 mm × 25 mm was investigated by using SIMION8.1 simulation. Six mRITs with the same dimensions as those simulated and with different slit widths, whose X electrodes were fabricated by the stainless steel chemical etching process, were tested and characterized on a homemade mass spectrometer platform. It is shown that the ejection slit dimensions have a significant impact on both the signal intensity and mass resolution. For an mRIT with these full-scale dimensions, the optimized slit dimensions are 0.6 mm × 18 mm. The optimized mRIT demonstrated capabilities including a mass/charge range of over 1000 Th, unit mass resolution at m / z 332, and a passable tandem mass spectrometry capability, which are better than the non-optimized RIT with the same dimensions.
研究领域:
分析化学
·
仪器科学与技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Miaomiao Xue,Zhenzhen Quan,Xiaohong Qin,Jianyong Yu,Yuling Li
Numerous experimental data indicate that higher viscosity solutions make it easier to obtain coarser fibers. However, the influences of viscosity on the whipping behavior of the jet and their subsequent impacts on the formation of terminal fiber during electrospinning remain topics of ongoing research. Simulation model and experiment presented in this study aim to solve these problems. The simulation model alters the dimensionless parameter F ve to predict the impacts of different viscosities on the bending behavior of the electrospun jet, while the experiment observes this behavior under different viscosities by regulating the solution concentration. The consistency of the simulation and experimental data implies the accuracy of the conclusions in this paper. Furthermore, the simulation model and experiment have demonstrated that a higher viscosity jet results in a smaller radius of the jet trajectory and lower jet velocity, which in turn leads to the formation of coarser fiber.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Kejia He,Qiang Song,Zhennan Yan,Na Zheng,Qiang Yao
Alkaline injection is an effective way to control the emission of high concentration SO 3 caused by the use of high-sulfur coal and selective catalytic reduction (SCR), but its performance is affected by the competitive absorption of SO 2 . A fixed-bed reactor was used to study the competitive absorption of SO 3 and SO 2 by Ca(OH) 2 . The dynamic absorption curves in different atmospheres were obtained, the intermediate products were characterized, and the competitive absorption mechanism was discussed. The absorption of SO 3 and SO 2 consists of the chemical kinetics-controlled and product layer diffusion-controlled stages. In the chemical kinetics-controlled stage, the SO 3 and SO 2 removal efficiencies were around 90% and 55% at first and then decreased; the SO 3 selectivity was around 0.1 at first and then increased. In the product layer diffusion-controlled stage, the SO 3 removal efficiency gradually decreased but kept greater than 10%, while the SO 2 removal efficiency deceased to zero; the SO 3 selectivity continued to increase and reached 0.31 at most when SO 2 absorption ceased. There existed significant competition between SO 3 and SO 2 absorption. The increasing SO 3 concentration promoted the SO 3 absorption and the increasing SO 2 concentration decreased it. The absorption of SO 3 increased the intensity of the SO 4 2 - band, decrease the intensity of the SO 3 2 - band, and made the product layer more compact. The possibility of SO 3 reacting with the components (CaSO 3 , CaSO 4 and CaCO 3 ) on the reacted Ca(OH) 2 surface was analyzed. Ionic diffusion was proposed as the main mechanism of the continuous SO 3 absorption after the formation of a dense product layer.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Manufacturing Processes
·
2024
·
IF 6.1
Zihao Li,Weiwei He,Yanzhen Zhang,Jide Wang,Guofang Hu,Yuyao Wu,Dege Li
The electrohydrodynamic (EHD) inkjet printing is rooted in the creep effect exhibited by fluid interfaces subjected to high-intensity electric fields. It utilizes the micro-jetting from the tip of the Taylor cone to print intricate patterns with sub-micron feature sizes. However, due to the limitations inherent in the jetting mechanism, the highest printing frequencies for conventional EHD are limited to several hundred Hertz. Here, we discover a novel phenomenon where the vibration of meniscus in an electric field can induce EHD jetting within microseconds, or even sub-microseconds. Based on this phenomenon, we propose a new method for achieving megahertz level EHD jetting based on meniscus vibrations (MVEHD). This paper systematically elucidates the fundamental mechanisms of the forced meniscus vibration, cone sharpening, and the jetting formation through a combination of experimental research and numerical simulation. Additionally, adjustable continues inkjet (CIJ) and drop on demand (DOD) inkjet printing modes were developed, demonstrating the potential of dual-mode technology in the development of automotive transparent glass heaters (TGHs) and Micro-LED displays. This method effectively elevates the efficiency of traditional EHD by 2 to 4 orders of magnitude, thereby laying a theoretical and technical foundation for the industrial application of high-throughput EHD technology.
研究领域:
材料科学
·
微纳米技术
·
印刷工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Qichen Shang,Daiwei Gu,Lin Sheng,Yu Chang,Jian Deng,Guangsheng Luo
Laminar jet flow is an underlying phenomenon used to generate droplets efficiently. However, its hydrodynamics at the microscale remains unknown. This work focuses on the scale effect. We innovatively propose the difference between the jet at the microscale and that at the regular scale is not in the wave development but in the regime of flow pattern, and it’s much more stable at the microscale. The characteristic effect at the microscale due to the intensified gas/liquid/solid–liquid interaction is first reported. The variations of characteristic sizes and hydrodynamics with the kinetic energy, physical property, and structural size at the microscale are analyzed by introducing two key parameters − wave velocity and wave numbers, which are first proposed. The result shows that the kinetic energy determines the hydrodynamics. Viscosity and interfacial tension significantly affect the microscale laminar jet. Using wave numbers, Tyler’s equation is modified, guiding the design of effective microdroplet-generation devices.
研究领域:
流体力学
·
微流控技术
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 5
·997
·
IF 3.352
Ajuan Song,Sijia Zhao,Yijun Cao,Chao Li
The size of bubbles generated from a porous sparger is at least an order of magnitude larger than the pore diameter under the steady air pattern. Recent studies have shown that the bubble size can be significantly reduced when the steady air flow is replaced by an oscillatory pattern. However, the effectiveness of oscillatory air flow on reducing bubble size under different sparger characteristics is yet to be studied. This work fundamentally investigates the response of bubble size to sparger characteristics under an oscillatory air pattern by segregating the bubble formation subprocesses into bubble detachment and consequent coalescence. The results show that bubble size significantly decreased with hydrophilic plates regardless of contact angle, owing to depressed coalescence, while no impact was observed for a hydrophobic plate. The influence of the oscillatory air pattern on decreasing bubble size was weakened as the chamber volume was increased, and above a critical volume the bubble-formation process became similar with that under a steady air pattern. An optimum plate thickness was obtained for bubble generation by avoiding weeping, and meanwhile taking full advantage of the momentum force by the oscillatory airflow. The outcomes show that the oscillatory air pattern in determining bubble formation closely depends on the sparger characteristics, which should be appropriately determined.Keywords:bubble size;sparger configuration;oscillatory air pattern;coalescence
研究领域:
化学工程
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-15
·
IF 4.38
Lin Lina,Zhu Wenju,Zhang Cong,Hossain Md. Yousuf,Oli Zubair Bin Sayed,Pervez Md. Nahid,Sarker Shamima,Hoque Md. Ikram Ul,Cai Yingjie,Naddeo Vincenzo
The conventional dyeing process requires a substantial amount of auxiliaries and water, which leaches hazardous colored effluents to the environment. Herein, a newly developed sustainable spray dyeing system has been proposed for cotton fabric in the presence of reactive dyes, which has the potential to minimize the textile dyeing industries environmental impact in terms of water consumption and save significant energy. The results suggest that fresh dye solution can be mixed with an alkali solution before spray dyeing to avoid the reactive dye hydrolysis phenomenon. After that, drying at 60–100 °C, wet fixation treating for 1–6 min, and combined treatments (wet fixation + drying) were sequentially investigated and then dye fixation percentages were around 63–65%, 52–70%, and above 80%, respectively. Following this, fixation conditions were optimized using L 16 orthogonal designs, including wet fixation time, temperature, dye concentration, and pH with four levels where the “larger-the-better” function was selected to maximize the dye fixation rate. Additionally, the color uniformity and wash and rubbing fastnesses were at an acceptable level when both treatments were applied. Finally, the dyes were hydrolyzed after wet fixation, and the hydrolysis percentages were enhanced after the drying process.
研究领域:
纺织科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Metals
·
2023
·Vol. 13
·期 7
·1253
·
IF 2.9
Jiaming Gao,Haiwei Fu,Chen Liu,Yifan Zhu,Xiuqing Fu
Heavy metal pollution in water, particularly Pb ion pollution, has seriously threatened human life and health. Therefore, the manufacture of efficient and sensitive heavy metal ion detection materials is essential. The objective of this study was to improve the electrochemical detection performance of laser-induced graphene (LIG) for Pb(II). Considering the excellent ion affinity and high activity of transition metals, Ni-Fe alloy coatings were prepared on the surface of LIG through jet electrodeposition. The prepared LIG and Ni-Fe/LIG were qualitatively analyzed through Raman spectrometry, X-ray diffraction analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The surface micromorphologies, charge transfer capabilities, and electrochemically active surface areas of LIG and Ni-Fe/LIG were characterized. The detection range and limit of detection (LOD) of Pb(II) for LIG and Ni-Fe /LIG as electrochemical sensors were analyzed. Results showed that compared with LIG, Ni-Fe/LIG had more surface active sites, a higher charge transfer capability, and a larger electrochemically active surface area that reached 0.828 cm2. Ni-Fe/LIG had a detection range of 20–1200 µg/L and an LOD of as low as 0.771 µg/L. Ni-Fe/LIG demonstrated a better electrochemical detection performance for Pb(II) than LIG when used as an electrochemical sensor.Keywords:Pb(II) detection;Ni-Fe/LIG;jet electrodeposition;electrochemical sensor
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2025
·
IF 3.9
Ze Yu Lian,Fu Zhen Gao,Run Xiang Qin,Jing Qiang Ma,Xue Zhong Wang
Baicalin as a flavonoid compound exhibits diverse and significant pharmacological activities. Nevertheless, its intrinsically poor aqueous solubility has been an obstacle to its clinical application. To overcome this limitation, this study devised an innovative crystallization strategy, thereby enabling the controllable synthesis of baicalin nanocrystals. Initially, the crystallization process of baicalin microcrystals in a stirred tank crystallizer was optimized, and the effects of parameters such as additive types, equivalents, stirring rates, and crystallization temperatures on the particle size and morphology of crystals were explored. Subsequently, technologies including X-ray diffraction (XRD), proton nuclear magnetic resonance spectroscopy (¹H NMR), online microscopy imaging, and pH monitoring were utilized to elucidate the crystallization mechanism of baicalin, thereby laying the theoretical foundation for the preparation of baicalin nanocrystals. Finally, this study innovatively introduced an impinging jet crystallizer, based on the foregoing research findings. In contrast to the traditional reactors, this device integrates the advantages of both impinging jet reactor and batch crystallizer, which can simultaneously strengthen the micro- and macro-mixing processes. This dual-scale modulation strategy achieves precise kinetic control by synchronizing nucleation enhancement with growth suppression and regulation. To identify the optimal process parameters of the impinging jet crystallizer, a computational fluid dynamics (CFD) simulation and experimental research were combined. Eventually, the baicalin nanocrystals featuring an average particle size of less than 300 nm and spherical morphology were successfully prepared.
研究领域:
药剂学
·
制药工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yulong She,Jie Tang,Chaoyang Wang,Zhicheng Wang,Zhengren Huang,Yong Yang
Silicon carbide (SiC) ceramic stands as a critical material in the realm of high-performance engineering ceramics . However, Crafting SiC ceramics with intricate structures and superior mechanical properties presents notable challenges in shaping, sintering, and processing. Binder jetting (BJ) additive manufacturing has the outstanding advantages of high forming efficiency and no thermal deformation , especially suitable for printing complex structure SiC components.; however, BJ printed green bodies often exhibit low density, resulting in high residual silicon content and diminished strength of the final components. In this work, we introduce a novel strategy to fabricate high-strength SiC components with complex geometries by improving the density of printed SiC green bodies. This method involves modifying the morphology of SiC powder through the molten salt method to increase the density of BJ 3D printed green bodies from 1.24 ± 0.13 g/cm³ to 2.01 ± 0.03 g/cm³, followed by a reactive melt infiltration process. The resulting RB-SiC ceramics display exceptional flexural strength , averaging 280.60 ± 33.05 MPa, and an elastic modulus of 294.67 ± 4.90 GPa. These values represent some of the highest for flexural strength and elastic modulus reported among 3D-printed SiC composites. With its robust mechanical performance and streamlined fabrication process, this strategy holds substantial promise for the production of structural SiC ceramics.
研究领域:
材料科学
·
增材制造
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qichen Shang,Yu Chang,Junjie Wang,Daiwei Gu,Jian Deng,Chencan Du,Guangsheng Luo
Liquid-liquid extraction can be greatly intensified in microchannel devices. Unfortunately, countercurrent flow is hard to realize at microscale. Meanwhile the microdroplet extraction efficiency is still low when the phase ratio is high. Micro-capillary jetting as a new technology for microdispersion can produce microdroplets with narrow size distribution without the restriction of phase ratio. In this work, an integrated microsystem of the micro-capillary jetting for microdroplet generation with the liquid–liquid countercurrent flow in a millimeter column has been developed, and the countercurrent extraction based on microdroplet under high phase ratio was successfully realized. More than 3 theoretical stages within 40 cm were achieved under the phase ratio of 50 ∼ 90 for H 2 O 2 extraction. This paper systematically reports the microdispersion, flow characteristics and extraction performances of the microsystem. It means a lot for future intensification of the countercurrent extraction with high phase ratio.
研究领域:
化学工程
·
微流体技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）