Article
Engineering, Environmental
Zhao-Quan Wen, Xi-Bao Zhang, Zheng-Hong Luo
Summary: A new model was developed to simulate the bubble size distribution in gas-solid bubbling fluidized bed, considering the collisions and wake entrainment of bubbles. The coalescence efficiency of colliding bubbles was developed based on the liquid film drainage process in a gas-liquid system. The model results effectively predicted the bubble size distribution and showed good agreement with experimental data.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Jihui Li, Bingjian Zhang, Yidan Shu
Summary: In this study, the population balance equation (PBE) was used to simulate the time-dependent adsorption amount distribution on adsorbent particles with different particle-size distributions. Two case studies were conducted to analyze the effect of particle-size distribution on adsorption processes. The results showed that particle-size distribution has a significant influence on adsorption performance, and the proposed model helps improve the prediction accuracy of adsorbent performance.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
P. Kazempoor, J. Asadi, R. J. Braun
Summary: This study addresses the challenges in modeling solid oxide electrolysis cells (SOECs) with feed gases containing low steam-to-CO2 concentration ratios. The common approach of neglecting the CO2 electrochemical reduction reaction in SOEC modeling is validated against experimental results. The validation results show that the model deviation with experimental data increases at certain current densities. It is also shown that when the steam flow supplied to the cell is high enough to support the water-gas shift reaction, the electrochemical reaction involving CO2 can be neglected.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Ceramics
Maria J. S. Lima, Fernando E. S. Silva, Maria V. M. Souto, Kivia F. G. Araujo, Roberta A. C. Menezes, Marcello Filgueira, Carlson P. Souza, Uilame U. Gomes
Summary: WC-Ni nanoparticles were successfully synthesized using the gas-solid reaction method, with synthesis temperature having the greatest influence on crystallite size, and the combination of temperature and isotherm also significantly affecting the response variable.
CERAMICS INTERNATIONAL
(2021)
Article
Environmental Sciences
Jun Ma, Yuqi Gu, Lei Liu, Yi Zhang, Mingli Wei, Annan Jiang, Xiang Liu, Chao He
Summary: Aeration plays a critical role in landfill remediation, but previous studies neglect the impact of landfill gases. This study investigated gas characteristics during aerobic waste degradation in the presence of landfill gas. It was found that all reactions, including aerobic degradation, CH4 oxidation, and anaerobic degradation, occur simultaneously during landfill aeration. A gas balance model was established to analyze the proportions of these reactions, showing that CH4 oxidation reaction is more advantageous than aerobic degradation. The results highlight the importance of considering landfill gas in landfill aeration processes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Materials Science, Multidisciplinary
A. R. C. Gerlt, A. K. Criner, S. L. Semiatin, K. N. Wertz, E. J. Payton
Summary: This paper addresses the challenge of accurately estimating the mean size of features within an opaque material using only 2D observations, and proposes a method for transforming 2D observations into estimates of the full 3D distributions with improved accuracy.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Ceramics
Athanasios Tiliakos, Mihaela Iordache, Mircea Raceanu, Adriana Marinoiu
Summary: By conducting broadband profiling in a wide temperature range, we can model the behavior of superionic materials at high temperatures and frequencies beyond the limitations of traditional impedance spectroscopy equipment. Applying this technique to NaSICON materials, we analyzed their conductivity, dielectric permittivity, and electric modulus over an extended temperature range. We proposed an alternative formulation based on linearized difference equations to address issues with the Arrhenius approximation commonly used in these analyses. Through Cole-Cole analysis and dissipation analysis, we identified relaxation bands and extracted initial condition parameters for the Jonscher power law. Simulations of the AC dispersion region at high temperatures and frequencies suggested that polaron tunneling mechanisms dominate in NaSICON, in line with recent insights on superionic conduction.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Laura Homa, Matthew Cherry, John Wertz
Summary: This article presents a method for detecting and characterizing microtexture regions (MTRs) with similar crystallographic orientation. Eddy current testing, a nondestructive evaluation method, is used to detect changes in conductivity related to changes in crystallographic orientation. Previous research has demonstrated the effectiveness of this method, and this article extends it to realistic microstructures.
Article
Engineering, Multidisciplinary
Hilman Syaeful Alam, Priyono Sutikno, Tubagus Ahmad Fauzi Soelaiman, Anto Tri Sugiarto
Summary: In this study, a hydrodynamic model was developed to predict bubble size distribution in a swirling-flow nanobubble generator. The model combined computational fluid dynamics and population balance method and was evaluated with several combinations of turbulence, coalescence, and breakage models. It was found that the combination of turbulence coalescence and Luo breakage models predicted the best. The selection of appropriate turbulence models improved the modeling accuracy.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2022)
Article
Polymer Science
Porfirio Lopez-Dominguez, Enrique Saldivar-Guerra, Maria Esther Trevino, Ivan Zapata-Gonzalez
Summary: A deterministic kinetic model was developed to simulate the particle size distribution (PSD) in emulsion polymerization (EP). The study compared the pseudo bulk (PB) model and the 0-1/0-1-2 model, and concluded that the PB model is not suitable for representing PSDs with steep fronts. There is also no generalized evidence to support the addition of a stochastic term in deterministic models to enhance PSD predictions.
Article
Chemistry, Multidisciplinary
Zaiping Chen, Wei Liu, Xiaohui Si, Junmeng Guo, Jiahang Huo, Zhiheng Zhang, Gang Cheng, Zuliang Du
Summary: To obtain a high-performance gas sensor, it is essential to ingeniously design sensing materials containing the features of high catalytic performance, abundant oxygen vacancies, and splendid grain dispersibility through a simple method. The gas sensor fabricated based on these materials shows exceptional sensitivity to acetone, opening up new possibilities for non-invasive disease diagnosis.
Article
Materials Science, Multidisciplinary
D. Mueller, I. Konyashin, S. Farag, B. Ries, A. A. Zaitsev, P. A. Loginov
Summary: The study investigates the kinetics of WC coarsening during the sintering of WC-10 wt% Co cemented carbide grades using various WC powders with different grain sizes and distributions, revealing that different grain characteristics affect the limiting stage of WC coarsening process, corresponding to different physical processes.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Engineering, Environmental
Ahmed Khalil, Diego Rosso, Christopher T. DeGroot
Summary: The study used CFD-PBM model to simulate a bubble column reactor and validate the model against experimental data. The sensitivity analysis showed that the coalescence model of Prince and Blanch provided the best results, and the model was shown to be insensitive to the breakup model. The importance of considering bubble size distribution (BSD) for accurately modeling mass transfer was demonstrated.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Energy & Fuels
Sriram Ravichandran, Mathias Pohl, Ahmad Afif Abdul Majid, Britain Bruner, David T. Wu, Manika Prasad, Carolyn A. Koh
Summary: This manuscript discusses the assessment of solid natural gas (SNG) hydrate technology for safe greenhouse gas (GHG) transport. The study focuses on the self-preservation capability of hydrates and the factors influencing their stability and dissociation. The findings suggest that compaction and sintering can increase hydrate pellet stability, and decreasing porosity and increasing formation and aging times further enhance stability. The study also examines the effects of a sudden temperature loss on pellet stability.
Article
Engineering, Chemical
Joseph D. Peterson, Ioannis Bagkeris, Vipin Michael
Summary: Population balance equations are a type of integro-partial differential equations widely used in engineering disciplines. This paper introduces a new numerical framework, miCDF, which transforms the standard PBE equations to solve for the inverse cumulative distribution function. It provides a straightforward and low-cost method for solving PBEs.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Juan C. Maya, Farid Chejne, Suresh K. Bhatia
Article
Engineering, Chemical
Jader Alean, Juan C. Maya, Farid Chejne
JOURNAL OF FOOD ENGINEERING
(2018)
Article
Energy & Fuels
Juan C. Maya, Farid Chejne
Article
Energy & Fuels
Juan C. Maya, Robert Macias, Carlos A. Gomez, Farid Chejne
Summary: A novel mathematical model for coal char gasification with CO2 was developed, considering non-uniform pore size distribution and various influencing factors. Critical parameters were found to be related to the microstructure of coal char and not significantly varied between different samples. As diffusional limitation increases, fragmentation occurs earlier in the reaction process due to the appearance of porosity gradients within the particle.
Article
Engineering, Chemical
Juan C. Maya, Farid Chejne, Suresh K. Bhatia
Article
Engineering, Chemical
Juan C. Maya, Farid Chejne, Suresh K. Bhatia
CHEMICAL ENGINEERING SCIENCE
(2017)
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)