Asia-Pacific Journal of Chemical Engineering
·
2021
·Vol. 17
·期 1
·e2720
·
IF 1.447
Chao Jia,Hu Shen,Yingyu Xu,Xingbang Hu,Guoqiang Yang,Zhibing Zhang
With enormous interfacial area for particle collection, microbubbles exhibit great application prospect in the mineral flotation. Under certain ionic strength, microbubbles can be produced continuously in the microbubble column without extra reagent addition. In this work, multiphase flow characteristics (Sauter mean diameter, bubble size distribution, gas holdup & interfacial area) were studied systematically with variables including the salt type, salt concentration, and operating conditions. Based on mathematical model, critical coalescence concentration was determined for each investigated salt. According to experimental results, a mathematical correlation was established between the Sauter mean diameter and ionic strength. For the formation of microbubble system, the lowest ionic strength was approximately 0.5 mol/L. Multiphase flow characteristics in the microbubble column depended highly on the ionic strength. The interfacial area and gas holdup increased by 38 times and more than 3 times respectively, with the ionic strength of Al 2 (SO 4 ) 3 rising from 0 to 1.5 mol/L. The critical coalescence concentration ranged from 0.037 mol/L (Al 2 (SO 4 ) 3 ) to 0.517 mol/L (NaCl), which correlated with the ionic strength of each salt.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Xiaohong Wang,Yonglei Wang,Liping Tian,Ling Ju,Ruibao Jia,Wuchang Song,Haiyang Yu,Jingjing Li
The eutrophication of reservoir water leads to the proliferation of algae, the DAF process can overcome the lack of algae removal capacity in conventional treatment processes, and its pollution removal efficiency is affected by the equipment performance. Among DAF equipment, multiphase flow pumps have attracted attention because of their simple configuration and low failure rate. This paper studied the equipment performance and pollution removal efficiency of a multiphase flow pump for DAF. The results showed that the dissolution efficiency of the equipment was approximately 55% and the average particle size of bubbles was less than 26 μm. When the pressure was greater than 0.36 MPa, the bubble stability time exceeded 4 min. The optimal working conditions were achieved at a dissolved gas pressure of 0.4 MPa. The maximum removal rates of turbidity , chlorophyll a , TOC, UV 254 and COD Mn by the DAF process were 56.49%, 50.23%, 23.73%, 28.75% and 23.98%, respectively. The trend in pollution removal efficiency was consistent with that of equipment performance parameters. The surface of the microbubbles was hydrophobic and could more easily adsorb high-molecular-weight organic substances with strong hydrophobicity and algae with strongly hydrophobic colloidal layers inside. In addition, regarding the THMFP, the experimental results showed that the removal rates of the precursors CHCl 3 , CHBrCl 2 and CHBr 2 Cl after DAF were 28.93%, 23.26% and 21.53%, respectively. Surface hydrophobicity is one of the main mechanisms by which microbubbles adhere to pollutants.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 23
·14456-14466
·
IF 4.036
Yang Liu,Chengxuan Wu,Xiaofang Lv,Xinyi Xu,Qianli Ma,Jiawei Meng,Shidong Zhou,Bohui Shi,Shangfei Song,Jing Gong
In the exploitation of deep-sea oil and gas resources, the multiphase production and transportation process is frequently plagued by pipeline blockage issues. Especially when hydrates and wax coexist simultaneously, the viscosity and plugging tendency of multiphase flow systems will synergistically increase. Understanding the evolution of morphology of hydrate particles and the agglomeration characteristics of hydrate particles in the presence or absence of wax crystals is crucial to flow assurance industry. With the assistance of a visualized reactor equipped with a three axis moving platform, microscopic images of cyclopentane hydrate during hydrate growth were obtained, and the cohesive force between hydrate particles was measured. It was found that during the hydrate growth on wax-free water droplets, the untransformed water inside the particles gradually wetted the surface of the particle. With the increase in temperature and contact time, the shell of hydrate particles changed from solid and rough to smooth and moist. The cohesive force measured in this work ranges from 3.14 ± 0.52 to 11.77 ± 0.68 mN m−1 with different contact times and temperature. When the contact time was 0 s and 10 s, the cohesive force between particles increased first and then stabilized with temperature. When the contact time was 20 s, the cohesive force was greater than the first two cases and showed an overall stable trend. An interesting phenomenon was also discerned: a large water bridge between particles formed during their separation process. For the wax-containing system, it required a longer time for water droplets to be converted into hydrate particles than that for wax-free systems. After wax participated in hydrate growth, hydrate particles showed the properties of elasticity and stickiness, which resulted in a larger liquid bridge between hydrate particles after their contact. It was suggested that wax crystal would alter the shell structure of hydrate particles, and change the surface properties of hydrate particles and the formation process of the liquid bridge, leading to significant and rapid increase in the cohesive force.
研究领域:
流变学
·
海洋油气开发
·
胶体与界面科学
·
能源工程
·
流动保障
✓ 已验证
DOI
高影响因子
ENERGY
·
2024
·
IF 9
Jinlong Cui,Xiaohui Wang,Yalong Li,Zhenxi Wang,Guangjin Chen,Liwei Cheng,Sheng Xu,Meng Cao,Liwei Sun
Since the thickness of hydrate-bearing sediments is usually tens to hundreds of meters, the influence of gravity on hydrate dissociation characteristics can no longer be ignored. In this study, experimental simulations were designed to investigate the influences of gravity on hydrate dissociation characteristics by depressurization . The experimental results showed that for sealed water-rich marine hydrate reservoir, gravity could cause more water to migrate downward. The free pore space in sediments was thus rapidly vacated, resulting in faster hydrate dissociation and gas production. The average gas production rate increased from 0.018 mol/min to 0.038 mol/min. In addition, the free pore space at the top of the sediments was vacated first. Hydrate dissociation there was thus faster. For unsealed water-rich marine hydrate reservoir, gravity could not only cause more and faster migration of water, but also more easily cause the formation of dominant channels for water migration, leading to an effective reduction in reservoir pressure . The cumulative water yield increased from 1380g to 8950g. Hydrate thus dissociated. Hydrate dissociated faster at positions close to the mining well where the pressure was lower. These findings can provide deep insights into the spatial evolution of multiphase flows during the exploitation of natural gas hydrates .
研究领域:
地质学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Entropy
·
2022
·Vol. 24
·期 5
·624
·
IF 2.738
Zhiwen Zhang,Xiaosen Li,Zhaoyang Chen,Yu Zhang,Hao Peng
The phase fraction measurement of gas-water-sand fluid in downhole is an important premise for safe and stable exploitation of natural gas hydrates, but the existing phase fraction measurement device for oil and natural gas exploitation can’t be directly applied to hydrate exploitation. In this work, the electrical resistivity properties of different gas-water-sand fluid were experimentally investigated using the multiphase flow loop and static solution experiments. The effect of gas phase fraction and gas bubbles distribution, sand fraction and sand particle size on the relative resistivity of the multiphase fluid were systematically studied. The measurement devices and operating parameters were also optimized. A novel combined resistivity method was developed, which demonstrated a good effect for the measurement of phase fractions of gas-water-sand fluid, and will have a good application potential in marine natural gas hydrates exploitation.Keywords:natural gas hydrates;sand production;multiphase fluid;phase fraction measurement;electrical resistivity;combined resistivity method
研究领域:
海洋工程
·
能源开发
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Coal Preparation and Utilization
·
2025
·
IF 2.1
Shixiang Li,Shang Gao,Youbang Sun,Qicheng Lu,Xuesong Yang,Yunrui Chen,Yaowen Xing,Xiahui Gui
Flotation of fine coal is often limited by low particle – bubble interaction. We quantify the hydrodynamics and kinetics of a Turbulent Microbubble Flotation Cell (TMFC) using computational fluid dynamics (CFD) coupled with a population balance model (PBM) and targeted experiments. In the TMFC, turbulent kinetic energy in the impeller region increases to 0.25 m2·s−2, while gas holdup rises to 60%. The Sauter mean bubble diameter stabilizes at d32 = 2.5–3.5 mm (Xiqi laboratory cell, XFD: 4.0 mm). A collision model indicates higher particle – bubble collision probability in the impeller – stator zone (TMFC maximum > 0.0025) than in the XFD (0.0009). Under matched operating conditions, the corrected flotation rate constant is markedly higher for the TMFC; at 1000 rpm, Km = 0.51 min−1 versus 0.04 min−1 for the XFD (12.8×). These quantitative results show that the TMFC sustains stronger turbulence, more uniform gas dispersion, and smaller, more stable bubbles, which together enhance interaction frequency and fine-particle recovery.
研究领域:
矿物加工
·
流体力学
·
化学工程
·
煤炭分选
·
多相流
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2025
·
IF 6.1
En Li,Zhi-Yuan Wang,Yue Zhang,Yu-Kun Guo,Peng-Fei Li,Jian-Bo Zhang,Qing-Wen Kong
Solving the issue of hydrate formation and blockage in pipelines during deepwater oil and gas development and hydrate-based green energy extraction is a crucial flow assurance safety concern. The micro-forces between hydrate particles and wetted surfaces are key parameters in studying the aggregation or detachment behavior of hydrates on pipe walls. Current research primarily focuses on carbon steel surfaces, with a lack of studies on the micro-forces between hydrates and wetted sand grain surfaces in oil and gas pipeline flow systems and hydrate extraction processes. In this study, a visual particle micro-force measurement device was designed to investigate the micro-forces between hydrates and wetted sand grain surfaces in a high-pressure system. The results showed that at subcooling degrees of 1°C, 3°C, 5°C, 7°C, and 10°C, the micro-forces between hydrate particles and wetted sand grain surface droplets
研究领域:
石油工程
·
流动保障
·
多相流
·
能源地质科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Yiqian Yang,Gang Wang,Xiaoyan Sun,Shuguang Xiang,Chunshan Li
Gas-liquid hydrodynamic characteristics under chemical reaction-enhanced mass transfer are crucial parameters for analyzing mass transfer behavior in microreactor, which can facilitate the optimization of the reaction conditions to achieve efficient mass transfer and improve catalytic performance. Herin, the movement and shrinkage of CO 2 bubbles in the microreactor were visualized and monitored using a high-speed camera. Four typical patterns such as bubble flow, bubble-Taylor flow, Taylor flow and Taylor-annular flow were observed, and the impact of temperature on flow pattern transition lines was investigated. Furthermore, the correlation models for predicting dimensionless initial CO 2 bubble length ( L B / d ) and liquid-side volumetric mass transfer coefficient were developed to illustrate the effects of reaction conditions on the hydrodynamics and mass transfer behavior of CO 2 bubble accompanying the chemical reaction. This work deepens the understanding of the hydrodynamics and mass transfer characteristics in a real CO 2 cycloaddition reaction system and provides a theoretical basis for the design and optimization of gas-liquid microreactor.
研究领域:
化学工程
·
反应工程
·
多相流
·
传质
·
微流控
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2025
·
IF 6.1
Qiang Luo,Zhi-Hui Liu,Xiao-Feng Dou,De-Li Gao,Zhi-Chao Liu,Fu-Long Ning
Clarifying the mechanism that results in the mechanical behavior differences of hydrate particles in different states is of great significance for understanding the agglomeration mechanism of hydrate particles and the mechanical behavior characteristics of the liquid bridge between particles in a pipeline environment dominated by oil or gas. In this study, the typical liquid bridge morphology and the consolidation characteristics of hydrate particles during the contact-pull process between hydrate particles and water droplets were observed using an improved micro-force testing device, as well as a force sensor with a higher sampling frequency and the electric displacement stage with a smaller step. It was found that the consolidation state of the liquid bridge changes in a complex manner in the gas-phase environment, and there is a special weak consolidation state: when the hydrate shell on the surface of the liquid bridge is pulled off, a new hydrate shell will form on the surface of the unconverted water at the fracture until the liquid bridge is stretched to several times the particle diameter length and breaks. Based on the hydrate shell formation theory and the existing model of hydrate interparticle mechanics, a possible liquid-bridge weak consolidation model was developed to explain this state to elucidate the mechanism that causes the difference in the mechanical behavior of the liquid bridge for hydrate particles in different states.
研究领域:
石油工程
·
多相流
·
材料力学行为
·
水合物聚集
·
界面现象
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Pengli Chen,Saier Liu,Zhangyi Gao,Min Qiu,You Ma,Zhenlun Wang,Xin Jin,Zhiling Xin,Minjing Shang,Yuanhai Su
Flow pattern prediction in multiphase systems is essential for characterizing hydrodynamic properties and optimizing mass/heat transfer efficiency. Herein, we propose a generative artificial intelligence (GenAI) flow pattern prediction framework for rapidly processing and analyzing large–scale flow pattern image data, with the first application to predictive modeling of gas–liquid Taylor flow in microchannels. The forecasting results of this GenAI–based prediction framework do not consist of discrete flow pattern classification labels but rather intuitive, spatially resolved high-fidelity visualization results comparable to experimental observations under steady–state operating conditions (e.g., high–resolution flow pattern images captured by high–speed cameras). Notably, the proposed prediction framework overcomes the limitations of conventional methods that only provide category information of flow patterns. More importantly, the model evaluation results demonstrate that this framework can effectively model the correlation between operating conditions and corresponding flow characteristics within microchannels, thereby validating the great potential of this GenAI technology for multiphase flow research.
研究领域:
多相流
·
工程中的人工智能
·
微流控
·
流体力学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Yuchuan Chen,Bohui Shi,Yang Liu,Qianli Ma,Shangfei Song,Lin Ding,Xiaofang Lv,Haihao Wu,Wei Wang,Haiyuan Yao,Jing Gong
With the tendency of the offshore petroleum industry moving to the deep-water fields, there are several challenges for the exploration and development of oil and gas with higher paraffin content in the deep-water severe environment, especially the complex flow assurance issues including the coexistence of wax precipitation and hydrate formation. The effects of wax on hydrate slurry viscosity, hydrate nucleation and growth, and hydrate dissociation were investigated in a rheometer. Results indicated that the stage characteristics of viscosity evolution during hydrate formation in waxy and wax-free emulsions were different, and two stages could be observed during the hydrate growth process in the presence of wax. Hydrate slurry viscosity increased with the wax content. The coupled hydrate–wax aggregates were difficult to be broken by the constant shearing force. The shear-thinning property of the hydrate slurry was not affected by the precipitated wax. Hydrate formation was inhibited due to the wax precipitated in the oil phase. Specifically, cyclopentane hydrate critical time and growth time increased with the wax content. The calculated hydrate volume fraction decreased with the wax content based on the suspension viscosity model. It was difficult for a water bridge to form between two hydrate particles during the hydrate-dissociation process with 3.0 and 5.0 wt % wax contents; therefore, no obvious increase in the slurry viscosity was observed when the slurry viscosity decreased during the dissociation process.
研究领域:
石油工程
·
流变学
·
能源材料
·
多相流
·
流动保障
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Tianqi Tang,Yurong He,Anxing Ren,Tianyu Wang
In this study, wet particle flow behaviors were investigated in a spouted bed using numerical simulations and experiments. Effects of liquid contents and viscosities were investigated. For the experiment, instantaneous particle distribution and particle velocity distributions were explored. Liquid content and viscosity affected flow pattern together. Keeping increasing liquid content and viscosity, the flow pattern displayed flow instabilities, and the gas channel became curved. Numerical simulation results of time-averaged particle velocities agreed well with the experimental data. The regime map of domination forces is shown. Drag force has little effect on particle flow behaviors with liquid viscosity exceeding 10 mPa·s, and contact and liquid bridge forces were almost 50–50. Furthermore, effects of liquid content and viscosity on particle granular temperature and velocity were explored. The experimental and numerical simulation results might provide theoretical guidance for reactor design and further investigation on particle flow behaviors with cohesive liquid.
研究领域:
化学工程
·
颗粒技术
·
多相流
·
过程工程
·
计算流体力学
·
粉体工程
·
反应器设计
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）