Article
Chemistry, Analytical
Hyeonyeong Ji, Jaehun Lee, Jaewon Park, Jungwoo Kim, Hyun Soo Kim, Younghak Cho
Summary: In this study, a microfluidic device with a high-aspect-ratio (HAR) channel was developed for generating monodisperse droplets. The device was fabricated using simple and cheap MEMS processes and successfully obtained smaller monodisperse droplets for a wider range of flow rates compared to previous methods.
Article
Mechanics
Qimeng Lv, Yingchun Wu, Can Li, Xuecheng Wu
Summary: This paper studies the breakup of a circular jet disturbed by wavelength modulation to produce non-uniform patterns of droplet sizes. Experimental results show that the jet breakup length and droplet size can be precisely controlled, and the coexistence stage of two droplet sizes depends on the difference in the growth rates of each disturbance. By applying multiple wavelengths in the perturbation, the potential to generate more mixing droplet streams is demonstrated.
Article
Engineering, Chemical
Lingzhen Kong, Jiaqing Chen, Tian Lan, Huan Sun, Kuisheng Wang
Summary: This study analyzed the primary breakup process of liquid jet column, droplet size and velocity distribution, as well as the hydrodynamic characteristics of gas flow in a tubular gas-liquid atomization mixer. The results showed that the gas flow rate is the main influencing parameter for droplet size and distribution uniformity in atomization.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Mechanics
Jianling Li, Shuai Shen, Jinhong Liu, Yu Zhao, Shengfu Li, Chenglong Tang
Summary: In this study, the secondary droplet size distribution after the breakup of a sub-milimeter droplet under high velocity cross flow conditions was experimentally determined using digital in-line holography. The study of spatial and droplet size distributions is important for corresponding droplet breakup modeling.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Chemistry, Multidisciplinary
Aleksandr Minko, Oleg Guskov, Konstantin Arefyev, Andrey Saveliev
Summary: This study analyzed the effects of water droplet breakup in supersonic flows, presenting an empirical model to predict droplet diameter and velocity distribution, and demonstrating the influence of Weber and Reynolds numbers on droplet gas-dynamic breakup rates.
APPLIED SCIENCES-BASEL
(2021)
Article
Mechanics
Sajjad Rezayat, Mohammad Farshchi, Edouard Berrocal
Summary: This paper uses liquid fluorescence high-speed imaging to study the disintegration process of a water jet in a quiescent atmosphere, and analyzes the temporal evolution and variation of breakup length at different breakup regimes. It is found that the liquid jet velocity at the onset of primary breakup oscillates within 6% of the liquid injection velocity for all considered operating conditions.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Multidisciplinary Sciences
Savvas Raptis, Tomas Karlsson, Andris Vaivads, Craig Pollock, Ferdinand Plaschke, Andreas Johlander, Henriette Trollvik, Per-Arne Lindqvist
Summary: Shocks, a powerful particle accelerator in nature, have been linked to relativistic electron acceleration and cosmic rays. In this study, the authors used MMS to observe high-speed downstream flows (jets) generated at the Earth's bow shock as a direct consequence of shock reformation.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Chemical
Wen Zeng, Shun Yang, Yichao Liu, Tianhang Yang, Zhizhong Tong, Xiaobiao Shan, Hai Fu
Summary: A mathematical model describing the nonlinear relationship between droplet generation in a T-junction microdroplet generator is established, showing that the droplet length varies nonlinearly with the driving-pressure ratio under low capillary numbers. Experimental testing of the droplet length and driving-pressure ratio relationship is done for different T-junction geometries. A closed-loop control droplet microfluidic system is demonstrated to more accurately control droplet size, with the relative standard deviation of droplet size under different flow conditions being less than 2%.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Bahram Jalili, Payam Jalili
Summary: This paper numerically investigates the effect of airflow turbulence intensity on liquid jet penetration and breakup. The results show that the breakup point approaches the liquid jet location as the turbulence intensity increases. However, the liquid jet trajectory and penetration depth are not significantly affected.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Zejian Hu, Shengji Li, Fan Yang, Xunjie Lin, Sunqiang Pan, Xuefeng Huang, Jiangrong Xu
Summary: The generation of monodisperse droplets using a piezoelectric method was studied in this research. By adjusting the pulse frequency and volume flow rate, satellite droplets can be eliminated and droplet size can be controlled. The technology shows potential in producing monodisperse aerosols for engineering applications.
Article
Nanoscience & Nanotechnology
Liang Hu, Lei She, Yanshen Fang, Rui Su, Xin Fu
Summary: This article investigates the effects of driving and jet parameters on the deformation characteristics of droplets generated by Rayleigh jet breakup. Numerical solutions simulate spatial instability of jet breakup and non-linear jet breakup influences droplet oscillation amplitude.
Article
Mechanics
Vasco Duke-Walker, Benjamin J. Musick, Jacob A. McFarland
Summary: Shock-driven multiphase mixing is a common phenomenon in various physical systems. In this study, experiments are conducted to investigate simultaneous droplet-scale phenomena under extreme conditions. The results indicate that the breakup of small droplets at high Weber numbers is likely dominated by the Rayleigh-Taylor mechanism.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Engineering, Mechanical
M. Pourrousta, M. M. Larimi, M. Biglarian, P. Hedayati
Summary: An experimental platform is developed for studying the behavior of the injected jet in a gas cross-flow. Water and air are used as jet and cross-flow gas respectively. The study focuses on covering a higher range of momentum ratios and Weber numbers to provide a more accurate equation for jet trajectory. It is found that as the momentum ratio increases, the breakup point height and the type of jet column mechanism change.
EXPERIMENTAL TECHNIQUES
(2023)
Article
Engineering, Chemical
Zhenyu Wu, Jinjin Cai, Tonghuan Yu, Yi Zhu, Feng Zhou, Xiaojiang Liang, Yong Nie
Summary: The breakup mechanism of droplets in an orifice jet mixer was studied to establish breakup models for accurate predictions. The experiments showed that high breakup frequency was achieved under high pressure drop and small mother droplet size, and the number of daughter droplets was positively correlated with the pressure drop and mother droplet size. New breakup models based on these features accurately predicted the experimental results.
Article
Chemistry, Analytical
Youngseo Cho, Jungwoo Kim, Jaewon Park, Hyun Soo Kim, Younghak Cho
Summary: This study proposes a microfluidic device for generating monodisperse micro-droplets, which has an asymmetric cross-sectional shape and high hypotenuse-to-width ratio (HTWR). It was found that the size and uniformity of the generated micro-droplets were affected by the HTWR of the channels, with monodisperse micro-droplets being generated when the HTWR of the asymmetric channel was over 3.5. The flow direction of the oil solution also affected the size of micro-droplets due to the asymmetric channel structures. Two kinds of monodisperse droplets with different sizes were successfully generated using the asymmetric channel structure in the developed microfluidic device.
Article
Thermodynamics
Can Li, Qimeng Lv, Yingchun Wu, Xuecheng Wu, Cameron Tropea
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Optics
Qimeng Lv, Yingchun Wu, Can Li, Xuecheng Wu, Linghong Chen, Kefa Cen
Article
Engineering, Chemical
Yingchun Wu, Qimeng Lv, Xuecheng Wu, Xinhao Wang, Linghong Chen, Kefa Cen
Summary: The oscillation of micron-sized liquid droplets can be measured using time-resolved rainbow refractometry to determine surface tension and viscosity. The method shows potential for improving experimental validation and reducing measurement errors, with relative errors of less than 5% for surface tension and 10% for viscosity.
Article
Engineering, Chemical
Qing Han, Mengqing Shi, Linkai Han, Di Liu, Mingwei Tong, Yuxin Xie, Zhonghua Xiang
Summary: Developing highly efficient bifunctional oxygen electrocatalysts is crucial for zinc-air flow batteries. Metal-organic frameworks (MOFs) and covalent organic polymers (COPs) have emerged as promising alternatives due to their designable and controllable atomic-level structures. However, their catalytic performances are limited by conductivity and catalytic activity. In this study, nanosheet FeNi-MOF and iron phthalocyanine rich COP hybrid materials are assembled through the pi-pi stacking effect to create highly efficient bifunctional electrocatalysts. The resulting catalyst exhibits superior catalytic performance and stability, making it a promising candidate for zinc-air flow batteries.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Daria Grigorash, Dmytro Mihrin, Rene Wugt Larsen, Erling H. Stenby, Wei Yan
Summary: The article introduces a new approach to describe the cross-association between molecules, allowing for the simulation of weakly bound molecular complexes with different conformations in mixtures. By incorporating this approach into the equation of state, accurate predictions of vapor-liquid equilibrium and liquid-liquid equilibrium can be made. The new method is validated through experiments on alcohol and acid mixtures, with the results compared to experimental data, demonstrating its accuracy and reliability.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Mohammed Al-Sharabi, Daniel Markl, Vincenzino Vivacqua, Prince Bawuah, Natalie Maclean, Andrew P. E. York, Axel Zeitler
Summary: This study used terahertz pulsed imaging to investigate the transport process of different solvents into ceramic catalytic materials. The results showed that the heating rate of the samples influenced the water transport rate, while the viscosity of 1-octanol slowed down its transport.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chukwunonso Anyaoku, Sati Bhattacharya, Rajarathinam Parthasarathy
Summary: This study aimed to enhance understanding of settling dynamics in viscoelastic fluids by developing a semi-empirical correlation and a dimensionless ratio, which accurately described the characteristics of settling suspensions.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Antti I. Koponen, Janika Viitala, Atsushi Tanaka, Baranivignesh Prakash, Olli-Ville Laukkanen, Ari Jasberg
Summary: This study focuses on the development of foam application chemicals for the paper and board industry. The research explores the rheology of the polyvinyl alcohol foam used in the process. Measurements were conducted to determine the foam viscosity and slip flow. The results suggest that slip flow contributes significantly to the total flow rate, and the obtained viscosity and slip models provide a solid foundation for industrial processes.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Dalei Sun, Jinghui Cai, Yating Yang, Zhiwu Liang
Summary: In this study, Fe-doped alpha-Bi2O3 catalysts with different Fe/Bi molar ratios were synthesized and utilized in the carbonylation of isobutyl amine with CO2. The results showed that Fe doping significantly enhanced the catalytic abilities of alpha-Bi2O3.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Yuan Tian, Xinxin Wang, Yanrong Liu, Wenping Hu
Summary: This paper predicts the solubility of nitrogen gas in ionic liquids (ILs) using two quantitative structure-property relationship (QSPR) models. By combining machine learning methods and ionic fragments contribution method, the accuracy and reliability of the prediction models are improved.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Liwang Wang, Wei Liu, Pan Yang, Yulong Chang, Xiaoxu Duan, Lingyu Xiao, Yaoming Hu, Jiwei Wu, Liang Ma, Hualin Wang
Summary: This study investigates the effective phase interfacial area (ae) of hydro-jet cyclones at different injection angles. The results show that a 45 degrees upward incidence angle yields the most favorable flow field characteristics for efficient mass transfer. The significant enhancement in ae of the hydro-jet cyclones offers the advantage of reducing equipment volume and cost savings.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chuanjun Wu, Jiangzhi Chen, Jiyue Sun, I-Ming Chou, Shenghua Mei, Juezhi Lin, Lei Jiang
Summary: In this study, the solubility of H2S hydrate in water was measured using Raman spectroscopy. The results showed that the solubility increases with temperature under certain equilibrium conditions, and the solubility also depends on pressure and temperature under different equilibrium conditions. A thermodynamic model based on the van der Waals-Platteeuw theory was developed to predict the solubility, demonstrating its accuracy.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Lorenzo Brivio, Serena Meini, Mattia Sponchioni, Davide Moscatelli
Summary: This study investigates the influence of three main parameters and proposes a kinetic model to predict the optimal operating conditions for high yield of dimethyl terephthalate (DMT) in the chemical recycling process of polyethylene terephthalate (PET).
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Hongju Lin, Fanhui Liao, Yanchang Chu, Mingyu Xie, Lun Pan, Yuanyuan Wang, Lijian Leng, Donghai Xu, Le Yang, Gangfeng Ouyang
Summary: A honeycomb NiCo/C-Na catalyst with a micro-meso-macroporous structure has been fabricated and shown to have significantly higher catalytic activity for the decarboxylation of fatty acids. It also proves to be efficient in upgrading sludge HTL bio-crude, resulting in a biofuel with decreased viscosity and increased density.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Xiaoxian Li, Rui Li, Min Lin, Mingde Yang, Yulong Wu
Summary: A series of coated non-noble metal porous carbon catalysts were synthesized and applied to the aqueous-phase deoxygenation of algal bio-oil. One of the catalysts showed excellent deoxygenation selectivity and catalytic activity at 250 degrees C. The catalyst exhibited good hydrothermal stability and the reaction mechanism was proposed based on product analysis and active site analysis.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
M. V. Chudakova, M. V. Popov, P. A. Korovchenko, E. O. Pentsak, A. R. Latypova, P. B. Kurmashov, A. A. Pimenov, E. A. Tsilimbaeva, I. S. Levin, A. G. Bannov, A. V. Kleymenov
Summary: A series of catalysts with different potassium contents were prepared using solution combustion synthesis and characterized using various techniques. The results showed that the potassium content affected the phase composition and texture of the catalysts. The addition of a small amount of potassium resulted in a change in particle size distribution, leading to higher hydrogen yield. The Ni-1%K2O/Al2O3 catalyst exhibited the highest hydrogen yield at temperatures of 675 and 750 degrees Celsius.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Aliakbar Roosta, Nima Rezaei
Summary: In this study, we modified the electrolyte cubic plus association equation of state (e-CPA EoS) and integrated it with two electrical conductivity models to estimate the electrical conductivity of 11 monovalent electrolyte solutions in water. The modified e-CPA model demonstrated better performance and the hybridization with electrical conductivity models resulted in two predictive models for estimating the electrical conduction of dilute and concentrated electrolyte solutions. These predictive models showed relative average percentage deviations (AARD) of 11.15% and 13.87% over wide ranges of temperature and electrolyte concentration.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Haoren Niu, Jianzheng Wang, Qingzhu Jia, Qiang Wang, Jin Zhao, Fangyou Yan
Summary: A study developed two quantitative structure-property relationship models for the complexation performance of alpha- and beta-cyclodextrins and validated their stability and predictive ability through internal and external validation. The models showed robustness and satisfactory performance, as demonstrated by the experimental results and model validations. These models can effectively predict the binding constants between cyclodextrins and various types of molecules, providing valuable tools for cyclodextrin design.
CHEMICAL ENGINEERING SCIENCE
(2024)