Article
Mechanics
Ebrahim Ghahramani, H. Strom, R. E. Bensow
Summary: Cavitating flows involve vapour structures with various length scales, highlighting the importance of accurately estimating small-scale cavities. A hybrid cavitation model that combines a mixture model with a Lagrangian bubble model has been developed to capture multi-scale dynamics and interactions between vapour structures and the continuous flow. This approach shows considerable improvements in predicting large cavities and capturing small-scale structures, even with lower mesh resolution.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Sofia Angriman, Amelie Ferran, Florencia Zapata, Pablo J. Cobelli, Martin Obligado, Pablo D. Mininni
Summary: This study investigates the three-dimensional clustering of velocity stagnation points, vorticity nulls, and inertial particles in turbulent flows with different large-scale flow geometries by combining direct numerical simulations and particle tracking velocimetry. The results show that although the flows have different topologies in terms of null clustering, the behavior of particles is similar in all cases, indicating the clustering of Taylor-scale neutrally buoyant particles as inertial particles.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Environmental
Justin Weber, Jonathan E. Higham, Jordan Musser, William D. Fullmer
Summary: This study focuses on quantifying the visible depth of field in a dense fluidized bed by extracting particle velocity from simulated data and high-speed videos, comparing the errors of different particle tracking methods. The results show that at a depth of one particle diameter, all three tracking codes provide accurate measurements, but errors increase when looking at full bed video measurements.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Austin Morales, Praveen Bollini, Michael P. Harold
Summary: Periodic operation of chemical reactors can enhance reactant conversion and product selectivity. This study presents a simple method to establish the relationship between isothermal point reaction enhancement and dynamic and kinetic parameters during low frequency operation. Experimental results demonstrate that this method can predict integral conversion enhancement for ideal reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Energy & Fuels
Yazhou Zhou, Daiyin Yin, Yuanting Li, Jingang He, Chengli Zhang
Summary: Chemical flooding is an important method for enhancing oil recovery in high-water cut reservoirs. Crude oil emulsification plays a positive role in increasing crude oil production, but it also adds complexity to fluid flow in the reservoir. This paper discusses advanced research techniques and the current status of multiphase fluid flows in chemical flooding, and explores prospective directions for future research.
ENERGY SCIENCE & ENGINEERING
(2023)
Review
Engineering, Environmental
Camila D. Bastiani, David Kennedy, Anthony Reynolds
Summary: Anaerobic digestion processes can generate renewable energy in the form of biogas while treating organic wastewater. The hydrodynamic behavior in high-rate reactors such as UASB, EGSB, and IC reactors depends on the interactions between wastewater, biogas, and biomass granules. Computational fluid dynamics (CFD) has been used to study and model the hydrodynamic behavior in these reactors. This review critically analyzes the use of CFD in modeling anaerobic granular sludge reactors, discussing modeling aspects, model validations, and future perspectives.
Article
Mechanics
Sri Savya Tanikella, Emilie Dressaire
Summary: This study investigates the dynamics of fluid-driven fractures in hydraulic fracturing through model experiments. The results show that the growth of fractures is influenced by the competition between viscous, elastic and toughness-related stresses, and the pre-existing fractures have a certain impact on the fracture dynamics.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Analytical
Atta Ullah, Muhammad Bilal Shabbir, Muhammad Umair, Muhammad Nadeem, Feng Xin
Summary: This study investigates the hydrodynamics of particle clusters and gas bubbles in fluidized beds using Digital Image Analysis and Transient Two Fluid Modeling. The results demonstrate that this approach aligns well with existing data and provides an alternative to costly experimentation for developing universal cluster size correlations.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Computer Science, Interdisciplinary Applications
A. Bussmann, J. Buchmeier, M. S. Dodd, S. Adami, I. Bermejo-Moreno
Summary: A methodology is introduced to study the dynamics of fluid interfaces in multiphase flows, with a focus on their break-up and coalescence. The algorithm tracks surfaces by isocontouring an interface and uses physical and geometric information to find correspondences in higher-dimensional space. Filters are applied to the correspondences and events to ensure physical realizability and consider temporal and geometric constraints. The resulting events are used to map the time evolution of the fluid interfaces into a graph, providing information on their dynamics.
COMPUTERS & FLUIDS
(2022)
Article
Mechanics
W. Herreman, C. Nore, L. Cappanera, J-L Guermond
Summary: This study demonstrates that swirling electrovortex flows can significantly enhance the mixing of alloys in the bottom layer of liquid metal batteries during discharge. By identifying a novel scaling law for the intensity of these flows and using a model developed in a previous study, the minimal intensity of the external magnetic field required for this enhancement is estimated.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Fluids & Plasmas
Shengyuan Zhang, Jun Tang, Huiying Wu
Summary: This paper proposes a lattice Boltzmann model based on the phase-field method for simulating large density ratio two-phase flows. The model avoids the calculation issues in previous models and has been validated through a series of benchmark tests.
Article
Mechanics
Vikash Pandey, Dhrubaditya Mitra, Prasad Perlekar
Summary: A direct numerical simulation study of buoyancy-driven bubbly flows in the presence of large-scale driving that generates turbulence reveals that increasing turbulence intensity leads to more curved bubble trajectories and decreased average rise velocity. The energy spectrum of the flow exhibits pseudo-turbulence scaling for small length scales and Kolmogorov scaling for larger scales. A scale-by-scale energy budget analysis helps understand the scaling behavior seen in the spectrum, with statistical properties consistent with experiments on turbulence modulation by air bubbles in water despite the weak buoyancy of the bubbles.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Aditya Madabhushi, Krishnan Mahesh
Summary: We propose a compressible multi-scale model that captures the dynamics of both large vapour cavities and micro-bubbles and takes into account the compressibility of the medium. The model tracks the homogeneous mixture of liquid and resolved vapour in an Eulerian sense and tracks the unresolved vapour in a Lagrangian sense using a novel equation. The model has been validated and shown to accurately capture the collapse of single and multiple bubbles, as well as the interaction between bubbles in a cluster.
JOURNAL OF FLUID MECHANICS
(2023)
Review
Thermodynamics
Somnath Santra, Shubhadeep Mandal, Suman Chakraborty
Summary: The phase-field method is an important tool for numerical modeling of multiphase and multicomponent flows, replacing sharp interfaces with diffuse transition layers to capture interface dynamics accurately. This method provides numerical convenience and thermodynamic rigor, offering a new perspective for modeling moving boundary problems accurately.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Review
Engineering, Environmental
Himanshu Goyal, Tai-Ying Chen, Weiqi Chen, Dionisios G. Vlachos
Summary: Microwaves offer an alternative heating method and process intensification in multiphase reactors. However, the mechanism of how microwaves affect chemical processes is still debated, highlighting the need for further research in experimental and modeling studies to bridge this gap. Promising results have been shown by recent modeling studies, indicating the potential for comprehensive understanding and optimization of microwave multiphase reactors through a combination of experimental and modeling tools.
CHEMICAL ENGINEERING JOURNAL
(2022)
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)