Review
Chemistry, Physical
Jianchao Cai, Yin Chen, Yang Liu, Shuang Li, Chenhao Sun
Summary: This review critically summarizes the fundamentals and concepts of various capillary imbibition models within different geometries over the past 100 years. It discusses the applications of these models and proposes a universal model based on dynamic wetting conditions and equivalent cylindrical geometry. Future research is suggested to focus on analyzing corner flow dynamics, wetting fluid snap-off, capillary rise of non-Newtonian fluids, and employing accurate physical simulation methods for capillary-driven flow processes.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Hongye Li, Xunli Zhang, Qingqiang Wang, Nan Jin, Haisheng Wei, Yuchao Zhao
Summary: This study employed Pickering emulsion to enhance the oxidation of benzyl alcohol catalyzed by Pd/SiO2 nanoparticles in a microchannel reactor. The experimental results showed that the O/W Pickering emulsion system was superior to the W/O system for the catalytic oxidation reaction. The optimized reaction conditions included a reaction temperature of 403 K, a CB of 5 wt%, an O2/BNOH ratio of 0.76, and a tube length of 8 m. Under these conditions, the conversion of BNOH and the selectivity of benzaldehyde were found to be 86.53% and 99.79%, respectively. The study provides important insights for effectively performing multiphase catalytic reactions involving solid catalyst particles in microchannel reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Wanqiang Wu, Lunbo Duan, Lin Li, Zhihao Yang, Daoyin Liu, Edward John Anthony
Summary: This study investigates the effects of pressure, superficial velocity, and particle size on gas interchange between bubble and emulsion phases in a high-temperature oxy-fuel fluidized bed. Both experiments and CFD simulations were used to analyze the gas interchange coefficient, which was found to decrease with increasing pressure and increase with increasing superficial velocity and particle size. The study proposes a formula to calculate the gas interchange coefficient considering the influence of pressure on the gas diffusion coefficient in a pressurized oxy-fuel fluidized bed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Computer Science, Interdisciplinary Applications
Yongyong Wu, Nan Gui, Xingtuan Yang, Jiyuan Tu, Shengyao Jiang
Summary: The new decoupled MRT method improves numerical stability by eliminating errors in the original model, successfully simulating multiphase flows at different density ratios, from low Re (We) to high Re (We).
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mechanics
Lohit Kayal, Saswata Basak, Ratul Dasgupta
Summary: In this study, the numerical simulations and minimal model are used to investigate the dimple and jet formation from a collapsing capillary wave trough. The results show that the sharp dimple and rising jet can be formed under different amplitudes, and the jet evolution can exhibit self-similar behavior in localized windows. This research reveals the interaction between linear and nonlinear effects in the formation of dimples and jets.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Chemical
Ege Ertekin, John M. Kavanagh, David F. Fletcher, Dale D. McClure
Summary: This paper presents a model that accurately simulates the hydrodynamics of bubble columns and shows good agreement with experimental data. The study also takes into account the presence of surface-active compounds in industrial processes, providing computational predictions in line with experimental measurements. Furthermore, a dataset has been provided to facilitate validation work by others and identify areas for further research.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Mechanics
Callum Cuttle, Alice B. Thompson, Draga Pihler-Puzovic, Anne Juel
Summary: Experiments showed that the process of droplet engulfment involves rapid submersion driven by capillary forces on the oil surface, followed by a slower peeling of the droplet from the interface. Both geometric constraints and gravity play essential roles in the completion of droplet engulfment. The longest engulfment times are observed for droplets of intermediate size due to the opposing effects of geometry and gravity.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
C. R. Constante-Amores, L. Kahouadji, S. Shin, J. Chergui, D. Juric, J. R. Castrejon-Pita, O. K. Matar, A. A. Castrejon-Pita
Summary: We investigate the influence of insoluble surfactants on the impact of surfactant-free droplets onto surfactant-laden thin liquid films using a three-dimensional numerical simulation approach. Our results show that the presence of surfactants affects the late stages of the dynamics by delaying the end-pinching mechanisms, resulting in longer ligaments. We also demonstrate that the addition of surfactants leads to surface rigidification and retards the flow dynamics.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Aniket S. Ambekar, Ulrich Ruede, Vivek V. Buwa
Summary: This study investigates the spreading of liquid in a randomly packed particle bed influenced by capillary, inertial, and gravitational forces using volume-of-fluid simulations. The relative contributions of these forces at different stages of spreading are analyzed through the time evolution of Weber and AB numbers. The results show that the initial spreading is primarily governed by inertial force, followed by capillary force at a later stage. The interplay of these forces leads to bubble entrapment and lateral liquid spreading. As the gravitational force increases, the contribution of inertial and capillary forces decreases, resulting in unified void filling and reduced lateral spreading. When the gravitational force is dominant, liquid spreading is primarily controlled by gravity, resulting in trickling flow and further decreased lateral spreading.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Environmental
Katie Cole, Pablo R. Brito-Parada, Kathryn Hadler, Diego Mesa, Stephen J. Neethling, Alexander M. Norori-McCormac, Jan J. Cilliers
Summary: This study measured the hydrodynamics of a stirred tank reactor containing multiphase flows using positron emission particle tracking (PEPT) technique. The probability density function (PDF) of particle velocity was estimated by averaging the location data from PEPT. The results showed bimodal vertical velocity distributions in the impeller radial jet. Comparisons of velocity distributions between hydrophilic and hydrophobic tracer particles revealed differences in various locations.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Mechanics
C. R. Constante-Amores, L. Kahouadji, A. Batchvarov, S. Shin, J. Chergui, D. Juric, O. K. Matar
Summary: The study found that the presence of surfactant affects the dynamics of the system through Marangoni-induced flow. These Marangoni stresses rigidify the interface, delay the cavity collapse, and influence the jet breakup process.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
M. Vakilha, R. Saghatchi, A. Alexiadis, M. Yildiz, M. S. Shadloo
Summary: This work presents a Lagrangian meshless method for modeling transient heat transfer and thermo-capillary effects at the interface of two-phase incompressible fluids. The model is validated and compared with conventional numerical methods, and is found to accurately simulate complex heat transfer problems.
COMPUTERS & FLUIDS
(2024)
Article
Thermodynamics
Kota Fujiwara, Kohei Yoshida, Akiko Kaneko, Yutaka Abe
Summary: This study focuses on the aerosol transportation resulting from the flow field inside single bubbles in bubble columns. The dominant role of inertial force in aerosol transportation is revealed through measuring the aerosol mass transfer efficiency of a single bubble and developing a three-phase model. The study also conducts a parametric analysis of aerosols with different diameters to investigate the mass transportation phenomena.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Chemical
Xuemei Xuan, Wenjie Lan, Juntao Yuan, Jianhong Xu, Shaowei Li
Summary: This study investigates the pressure drop of liquid-liquid slug flow, examining the effects of velocity, slug length, and interfacial tension. The findings reveal previously unreported characteristics and phenomena that cannot be explained by existing pressure drop models. A new model is proposed to predict the transition from developing to fully developed slug flow, and its wide applicability is demonstrated through experimental and other study results.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Mathematics, Applied
Qiaozhong Li, Xiaodong Niu, Zhiliang Lu, You Li, Adnan Khan, Zishu Yu
Summary: An improved single-relaxation-time multiphase lattice Boltzmann method is developed for simulating multiphase flows with large density ratios and high Reynolds numbers, showing good stability and reliability in complex multiphase flow simulations.
ADVANCES IN APPLIED MATHEMATICS AND MECHANICS
(2021)
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)