INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Daofan Ma,Hao Jiang,Guangwei Wang,Youguang Ma,Chunying Zhu,Xiangyang Tang
A novel droplet separation method was proposed by using an array protrusion microchannel, which could divert droplets of different sizes into designated branch channels. The performance and mechanism of droplet sieving were investigated. In this work, three distinct flow patterns were obtained: partial sieving, complete sieving, and main drop loss regimes. The influences of droplet length and operation conditions on the sieving efficiency were studied systematically. It was found that, in the partial sieving flow pattern, the increase of small droplet diameter is not conducive to sieving, and there exists a critical diameter of the small droplet for complete sieving under a constant main droplet size, which relies primarily on the array protrusion height. The operating range of the complete sieving flow pattern extends when increasing the main droplet size, and the critical capillary number for evolving into the main droplet loss flow pattern rises. The sieving efficiency increases with the flow rate of the continuous phase in the regulating channel while decreasing with that in the main channel.
研究领域:
微流控技术
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生物工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Maogang He,Nan Xin,Chengjie Wang,Yang Liu,Ying Zhang,Xiangyang Liu
In this work, we used a flow method for measurement of critical properties of six binary mixtures (2-butanol + cyclohexane, 2-butanol + hexane , 2-butanol + heptane, 2-butanol + octane, 2-butanol + nonane and 2-butanol + decane) and two ternary mixtures (2-butanol + hexane + heptane and 2-butanol + octane + decane). The critical properties were determined by observing the disappearance and reappearance of the gas–liquid phase meniscus in a quartz glass tube. The standard uncertainties of temperatures and pressures for both binary and ternary mixtures were estimated to be less than 0.2 K and 5.2 kPa, respectively. These critical data provide the boundaries of the two-phase regions of the related mixture systems. Six binary systems show non-ideal behaviors in the loci of critical temperatures. We used the Redlich–Kister equations to correlate the critical temperatures and pressures of these systems and listed the binary interaction parameters. The maximum average absolute deviation (AAD) of each binary system between experimental data and calculated results from Redlich–Kister equations is 0.038% for critical temperatures, and 0.244% for critical pressures. Moreover, the two ternary systems were newly reported and correlated by Cibulka’s and Singh’s expressions. The maximum AAD of critical temperatures and critical pressures are 0.103% and 0.433%, respectively.
研究领域:
物理化学
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燃料化学
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产品关联
DOI
高影响因子
AICHE JOURNAL
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2020
·Vol. 66
·期 8
·e16260
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IF 3.519
Chong Shen,Qibo Zheng,Minjing Shang,Li Zha,Yuanhai Su
In this work, an automatic liquid–liquidtwo-phase flow pattern recognition platform was developed to help circumvent the difficulties in labor-intensive hydrodynamics studies. Trained by about 30,000 of human-labeled flow pattern images, a convolutional neural network was built with the expert-level ability in the flow pattern recognition tasks and then coupled with automatic pump feeding system and online high-speed camera monitoring system to realize the high-throughput experimentation platform for microchannels. Effects of important factors such as flow rate, viscosity, interfacial tension, and so on were studied, and different flow pattern maps were obtained. With these thousands of flow pattern data in hand, we eventually drew the generalized liquid–liquidtwo-phase flow map and then proposed the relatively prudent criteria for slug flow operation window in the microchannel. This study extended the applications of artificial intelligence on microreactor technology or microfluidics, and in particular facilitated understanding complex hydrodynamics and flow patterns.
研究领域:
微流体技术
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流体力学
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人工智能应用
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产品关联
DOI
高影响因子
ENERGY & FUELS
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2020
·
IF 3.421
Xiaoda Wang,Xin Xu,Qinglian Wang,Zhixian Huang,Jianyang He,Ting Qiu
This work studied the flow pattern and reaction kinetics for fatty acid methyl ester (FAME) synthesis through transesterification of palm oil with methanol in a microchannel reactor. It was observed in the experiments using a high-speed camera that the flow pattern evolved along the microchannels due to the coalescence of adjacent droplets. This coalescence phenomenon had significant effects on the variation trend of FAME yield along the microchannels. The influences of catalyst concentration, reaction temperature, and reactant molar ratio on the flow pattern were systematically investigated. It was the first successful attempt to determine the kinetics data for the transesterification of palm oil with methanol in the first 120 s, owing to the use of microchannel reactors. A pseudo-homogeneous model was used to describe the reaction kinetics of FAME synthesis in microchannels. This model performed well at the condition that the reaction equilibrium was reached before the occurrence of droplet coalescence.
研究领域:
化学工程
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生物化工
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产品关联
DOI
高影响因子
Micromachines
·
2021
·Vol. 12
·期 8
·883
·
IF 2.891
Haicheng Lv,Zhirong Yang,Jing Zhang,Gang Qian,Xuezhi Duan,Zhongming Shu,Xinggui Zhou
Based on the split-and-recombine principle, a millimeter-scale butterfly-shaped microreactor was designed and fabricated through femtosecond laser micromachining. The velocity fields, streamlines and pressure fields of the single-phase flow in the microreactor were obtained by a computational fluid dynamics simulation, and the influence of flow rates on the homogeneous mixing efficiency was quantified by the mixing index. The flow behaviors in the microreactor were investigated using water and n-butanol, from which schematic diagrams of various flow patterns were given and a flow pattern map was established for regulating the flow behavior via controlling the flow rates of the two-phase flow. Furthermore, effects of the two-phase flow rates on the droplet flow behavior (droplet number, droplet size and standard deviation) in the microreactor were investigated. In addition, the interfacial mass transfer behaviors of liquid–liquid flow were evaluated using the standard low interfacial tension system of “n-butanol/succinic acid/water”, where the dependence between the flow pattern and mass transfer was discussed. The empirical relationship between the volumetric mass transfer coefficient and Reynold number was established with prediction error less than 20%.
研究领域:
微流控
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化学工程
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流体力学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Jiyuan Feng,Nan Lv,Cheng Liu,Zhiwei Lyu,Yuteng Zhang,Haifeng Zhang
Facing increasing electromagnetic radiation pollution, soft sensors with electromagnetic interference (EMI) shielding is highly desirable. Here, flexible electromagnetic shielding [polyacrylonitrile/Fe 3 O 4 /polyaniline]//[multiwalled carbon nanotube/polyvinyl pyrrolidone] (denoted [PAN/Fe 3 O 4 /PANI]//[MWCNT/PVP]) Janus membrane is reported for pressure and sliding sensing. The [PAN/Fe 3 O 4 /PANI] layer of Janus membrane as the force and sliding sensing unit can generate direct current-type (DC-type) voltage signals by conducting polymer/metal Schottky junction, whereas [MWCNT/PVP] layer serves as main electromagnetic shielding unit. Under the vertical force and horizontal sliding of aluminum (Al) foil, it can output DC-type voltage signals based on the Schottky contact. The performance of [PAN/Fe 3 O 4 /PANI]//[MWCNT/PVP] Janus membrane for pressure and sliding sensing is appropriately explored and assessed. Moreover, the Janus membrane exhibits excellent shielding effects with average EMI shielding effectiveness (SE) of 37.54 dB in 8.2–12.4 GHz (X-Band) frequency ranges. Thus, based on the asymmetrical double-layer structure, soft DC-type sensor with EMI shielding is achieved, showing utilization potential in wearable electronics and intelligent robots.
研究领域:
材料科学
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电气工程
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传感器
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纳米技术
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可穿戴技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）