Review
Engineering, Chemical
Alberto Di Renzo, Erasmo S. Napolitano, Francesco P. Di Maio
Summary: In the past decade, the application of CFD-DEM for fluidized beds has expanded from small, lab-scale units to larger scale systems, benefiting greatly from coarse graining methods. By introducing coarse graining procedures based on different physical backgrounds, the number of particles that can be simulated has increased, covering pilot-scale and industrially relevant systems. The review discusses scaling for contact forces, hydrodynamic forces, and cohesive forces, quantifying computational savings in terms of coarse graining degree and presenting recent applications and future directions in the field.
Article
Thermodynamics
Victor Oliveira Ferreira, Daniel Silva Junior, Karla Raphaela Braga de Melo, Bruno Blais, Gabriela Cantarelli Lopes
Summary: The high potential of liquid fluidization in water treatment and biogas production systems has not been fully explored. In this study, an alternative method based on force balance and drag correlations was proposed to estimate bed porosity. The results showed that this method provides more accurate and reliable predictions of liquid fluidized bed expansion compared to the traditional Richardson-Zaki equation.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Chemical
Kevin E. Buettner, Jennifer S. Curtis, Avik Sarkar
Summary: The lack of constitutive drag laws for non-spherical particles in fluid-particle flows highlights the need for dedicated laws to replace previous ad-hoc methods. Computational fluid dynamics simulations were used to explore important variables for future model development and propose a preliminary non-spherical drag model based on the results.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Junwu Wang, Peng Zhao, Bidan Zhao
Summary: The study has shown that the current drag correlations underestimate the effective interphase drag force, and the force exerted on a single particle varies significantly even in statistically homogeneous systems. Although the stochastic CFD-DEM method can provide minor improvements, it is still insufficient to bridge the gap between PR-DNS and CFD-DEM simulations, indicating the need for further research and development of a more accurate drag model.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Musango Lungu, John Siame, Lloyd Mukosha
Summary: This study validates a detailed coarse-grained CFD-DEM model in the open-source code MFIX. The validation metrics include fluidization behavior, minimum fluidization velocity, averaged pressure drop, mean particle velocity, and rms particle velocity. The choice of spring constant impacts fluidization dynamics, and the Tang et al. (2015) drag correlation performs well at higher velocities. The coarse-grained model predicts a lower minimum fluidization velocity, and the error in average pressure drop reduces with increasing statistical weight at low gas velocities. The mean particle velocity profiles show no significant differences between the coarse-grained and conventional CFD-DEM models, while the rms profiles decrease with increasing statistical weight. Additionally, there is a gain in wall clock time for completing a case using the coarse-grained model.
Article
Engineering, Chemical
Suyang Pan, Jiliang Ma, Daoyin Liu, Xiaoping Chen, Cai Liang
Summary: This study provides insights into the expansion of wet beds in fluidized systems through theoretical and experimental approaches. The bed expansion ratio is found to increase with particle diameter and liquid surface tension, while being unaffected by liquid viscosity. The expansion ceases when the tensile strength of the wet bed equals the shear stress from gas drag force. From an optimization perspective, increasing particle diameter and liquid surface tension can enhance the gas-holding capacity of wet beds during fluidization.
Article
Engineering, Chemical
Jingwei Geng, Zhuo Yang, Yujie Tian, Bona Lu, Wei Wang
Summary: To investigate the effects of macroscale constraints on fluidization, fine-grid simulations were used to compare the periodic domain and realistic bed. The differences were highlighted by examining force balance conditions in the gas-phase, solid-phase, and mixture. The influence of the bounding wall was implicitly included through markers such as gas-phase pressure gradient and turbulent kinetic energies.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Shouzheng Yuan, Yiming Zhao, Xiao Chen, Qiang Zhou
Summary: This study aims to enhance the performance of existing filtered drag models by considering the influence of the wall boundary and evaluate the predictive capability of the newly proposed correction drag model through simple posteriori validations.
Article
Engineering, Chemical
Junnan Zhao, Guodong Liu, Xiaolong Yin, Xiaohui Li, Zhiyong Gao, Huilin Lu
Summary: Spout-fluid beds are widely used in industries for efficient particle and gas contact. A two-fluid model (TFM) was used to study flow structures in spout-fluid bed operation. Results showed that an effective restitution coefficient in TFM improves prediction accuracy significantly, with kinetic motion dominating particle-particle momentum transfer in certain regions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Chemical
Li-Tao Zhu, He Lei, Bo Ouyang, Zheng-Hong Luo
Summary: This work systematically investigates the applicability of mesoscale drag models in various flow regimes and optimizes the operational and fluidization quality of a fluidized bed reactor through bed internals design and evaluation of bed size effects.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Environmental
Shanwei Hu, Xinhua Liu
Summary: This study utilized the population balance model (PBM) and energy-minimization multi-scale (EMMS) model to describe the hydrodynamics of gas-solid bubbling fluidized beds, incorporating both models into a coupled simulation scheme to predict bed expansion characteristics and solid velocities. The results were validated through comparison with experimental data, showing satisfactory agreement between measured and simulated bubble size distributions. The proposed sub-grid drag model and coupled simulation scheme are effective in capturing the salient features of gas-solid bubbling fluidized beds hydrodynamics.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Jun-Sen Li, Li-Tao Zhu, Wei-Cheng Yan, Taha Abbas Bin Rashid, Qun-Jie Xu, Zheng-Hong Luo
Summary: The study found that the impact of different turbulence models on predictions of fluidization processes in the mesoscale gas-solid flow system varies. By utilizing a hybrid model and different turbulence closure models in a circulating fluidized bed CFB, more accurate predictions of flow characteristics can be achieved.
Article
Engineering, Chemical
Katarina S. Sucurovic, Darko Jacimovski, Mihal Duris, Zorana Arsenijevic, Nevenka Boskovic Vragolovic
Summary: This study investigates the fluid-dynamic properties of inverse fluidized beds by studying the minimum fluidization velocity and bed expansion. Experiments were conducted using water and an aqueous glycerol solution with different concentrations as the fluidizing medium in a cylindrical column filled with polypropylene and polystyrene particles. The dependence of bed porosity on fluid superficial velocity was experimentally determined for different particles and fluidizing media. The influence of fluidizing medium viscosity and particle density on bed expansion and minimum fluidization velocity was analyzed. A correlation for the expansion of inverse fluidized beds is proposed in this paper.
PARTICULATE SCIENCE AND TECHNOLOGY
(2023)
Review
Energy & Fuels
Hengjun Gai, Peiyi Yang, Qiang Zhang, Mengqi Lin, Hongbing Song, Meng Xiao, Tingting Huang, Quanhong Zhu
Summary: Circulating fluidized bed reactors are widely used in the energy industry for gas-solid reactions. They can be classified into two categories based on fluidization regimes: dilute-dense and dual-dense. The concept of dual-dense gas-solid circulating fluidization has not been well understood, hindering its commercial application. This review provides a detailed analysis of the dual-dense system, including mechanism, structural and operating parameters, particle circulation prediction, gas-solid flow simulation, and potential applications, while identifying existing controversies and unresolved issues.
Article
Engineering, Chemical
Konstantin Zaynetdinov, Srujal Shah, Mehran Kiani-Oshtorjani, Payman Jalali
Summary: The momentum exchange between phases is crucial in gas-solid flow modeling, but there is no consensus on the most accurate drag model. This study performs direct numerical simulations of gas flow through various static monodisperse particle configurations and compares thirteen drag models, introducing correction factors to improve the accuracy of 2D modeling.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Engineering, Environmental
H. Mirsandi, W. J. Smit, G. Kong, M. W. Baltussen, E. A. J. F. Peters, J. A. M. Kuipers
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Engineering, Chemical
Lei Yang, J. T. Padding, J. A. M. Kuipers
Article
Engineering, Chemical
Jiangtao Lu, Elias A. J. F. Peters, Johannes A. M. Kuipers
Article
Engineering, Chemical
Claire M. Y. Claassen, Shafiul Islam, E. A. J. F. (Frank) Peters, Niels G. Deen, J. A. M. (Hans) Kuipers, Maike W. Baltussen
Article
Engineering, Chemical
Ivan Mema, Kay A. Buist, J. A. M. (Hans) Kuipers, Johan T. Padding
Article
Engineering, Environmental
A. Aguirre, V. Chandra, E. A. J. F. Peters, J. A. M. Kuipers, M. F. Neira D'Angelo
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Engineering, Mechanical
H. Mirsandi, W. J. Smit, G. Kong, M. W. Baltussen, E. A. J. F. Peters, J. A. M. Kuipers
EXPERIMENTS IN FLUIDS
(2020)
Article
Engineering, Environmental
V Chandra, E. A. J. F. Peters, J. A. M. Kuipers
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Physical
Aditya Sengar, Rutger A. van Santen, Johannes A. M. Kuipers
Article
Engineering, Chemical
Lijing Mu, Kay A. Buist, J. A. M. Kuipers, Niels G. Deen
Article
Mechanics
A. M. Oldeman, S. Kamath, M. Masterov, T. S. D. O'Mahoney, G. J. F. van Heijst, J. A. M. Kuipers, K. A. Buist
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2020)
Article
Thermodynamics
Saurish Das, A. Panda, H. Patel, N. G. Deen, J. A. M. Kuipers
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Mechanics
H. Mirsandi, M. W. Baltussen, E. A. J. F. Peters, D. E. A. van Odyck, J. van Oord, D. van der Plas, J. A. M. Kuipers
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2020)
Article
Engineering, Chemical
A. Panda, H. Patel, E. A. J. F. Peters, M. W. Baltussen, J. A. M. Kuipers
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Mechanics
Tim M. J. Nijssen, Hans A. M. Kuipers, Jan van der Stel, Allert T. Adema, Kay A. Buist
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2020)
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)
